Quality Measure Implementation Guide
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Quality Measure Implementation Guide - Downloaded Version null See the Directory of published versions

## Data Type Profile: CQM DataType Timing - XML Profile

Page standards status: Trial-use | Maturity Level: 4

XML representation of the cqm-datatype-timing data type profile.

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    <StructureDefinition xmlns="http://hl7.org/fhir">
      <id value="cqm-datatype-timing"/>
      <language value="en"/>
      <text>
        <status value="extensions"/>
        <div xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en"><p class="res-header-id"><b>Generated Narrative: StructureDefinition cqm-datatype-timing</b></p><a name="cqm-datatype-timing"> </a><a name="hccqm-datatype-timing"> </a><div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Language: en</p></div><table border="0" cellpadding="0" cellspacing="0" style="border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top;"><tr style="border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top"><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="The logical name of the element">Name</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Information about the use of the element">Flags</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Minimum and Maximum # of times the element can appear in the instance">Card.</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px; width: 100px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Reference to the type of the element">Type</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Additional information about the element">Description &amp; Constraints</a><span style="float: right"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"><img src="data:image/png;base64, " alt="doco" style="background-color: inherit"/></a></span></th></tr><tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck1.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: white; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-cqm-datatype-timing-definitions.html#Timing">Timing</a><a name="Timing"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">0</span><span style="opacity: 0.5">..</span><span style="opacity: 0.5">*</span></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a href="http://hl7.org/fhir/R4/datatypes.html#Timing">Timing</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">A timing schedule that specifies an event that may occur multiple times</span></td></tr>
    <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck01.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_vjoin_end.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: #F7F7F7; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-cqm-datatype-timing-definitions.html#Timing.repeat">repeat</a><a name="Timing.repeat"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">1..1</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">Element</span></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">When the event is to occur</span></td></tr>
    <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck010.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_blank.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_vjoin.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: white; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-cqm-datatype-timing-definitions.html#Timing.repeat.frequency">frequency</a><a name="Timing.repeat.frequency"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">1..1</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a style="opacity: 0.5; opacity: 0.5" href="http://hl7.org/fhir/R4/datatypes.html#positiveInt">positiveInt</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">Event occurs frequency times per period</span></td></tr>
    <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck010.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_blank.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_vjoin.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: #F7F7F7; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-cqm-datatype-timing-definitions.html#Timing.repeat.period">period</a><a name="Timing.repeat.period"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">1..1</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a style="opacity: 0.5; opacity: 0.5" href="http://hl7.org/fhir/R4/datatypes.html#decimal">decimal</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">Event occurs frequency times per period</span></td></tr>
    <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck010.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_blank.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_vjoin.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: white; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-cqm-datatype-timing-definitions.html#Timing.repeat.periodUnit">periodUnit</a><a name="Timing.repeat.periodUnit"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">1..1</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a style="opacity: 0.5; opacity: 0.5" href="http://hl7.org/fhir/R4/datatypes.html#code">code</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">s | min | h | d | wk | mo | a - unit of time (UCUM)</span></td></tr>
    <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck000.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_blank.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_vjoin_end.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: #F7F7F7; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-cqm-datatype-timing-definitions.html#Timing.repeat.timeOfDay">timeOfDay</a><a name="Timing.repeat.timeOfDay"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="padding-left: 3px; padding-right: 3px; color: white; background-color: red" title="This element must be supported">S</span></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">0..1</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a style="opacity: 0.5; opacity: 0.5" href="http://hl7.org/fhir/R4/datatypes.html#time">time</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><span style="opacity: 0.5">Time of day for action</span></td></tr>
    <tr><td colspan="5" class="hierarchy"><br/><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"><img src="data:image/png;base64, " alt="doco" style="background-color: inherit"/> Documentation for this format</a></td></tr></table></div>
      </text>
      <extension
                 url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
        <valueCode value="cqi"/>
      </extension>
      <extension
                 url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
        <valueInteger value="4">
          <extension
                     url="http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom">
            <valueCanonical
                            value="http://hl7.org/fhir/uv/cqm/ImplementationGuide/hl7.fhir.uv.cqm"/>
          </extension>
        </valueInteger>
      </extension>
      <extension
                 url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
        <valueCode value="trial-use">
          <extension
                     url="http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom">
            <valueCanonical
                            value="http://hl7.org/fhir/uv/cqm/ImplementationGuide/hl7.fhir.uv.cqm"/>
          </extension>
        </valueCode>
      </extension>
      <url
           value="http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-datatype-timing"/>
      <identifier>
        <system value="urn:ietf:rfc:3986"/>
        <value value="urn:oid:2.16.840.1.113883.4.642.40.61.42.37"/>
      </identifier>
      <version value="1.0.0"/>
      <name value="CQMDataTypeTiming"/>
      <title value="CQM DataType Timing"/>
      <status value="active"/>
      <date value="2026-03-12T00:28:27+00:00"/>
      <publisher value="HL7 International / Clinical Quality Information"/>
      <contact>
        <telecom>
          <system value="url"/>
          <value value="http://www.hl7.org/Special/committees/cqi"/>
        </telecom>
      </contact>
      <description
                   value="Quality Measure IG constraints on the Timing datatype used in reportingTiming."/>
      <jurisdiction>
        <coding>
          <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
          <code value="001"/>
        </coding>
      </jurisdiction>
      <fhirVersion value="4.0.1"/>
      <mapping>
        <identity value="v2"/>
        <uri value="http://hl7.org/v2"/>
        <name value="HL7 v2 Mapping"/>
      </mapping>
      <mapping>
        <identity value="rim"/>
        <uri value="http://hl7.org/v3"/>
        <name value="RIM Mapping"/>
      </mapping>
      <kind value="complex-type"/>
      <abstract value="false"/>
      <type value="Timing"/>
      <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Timing"/>
      <derivation value="constraint"/>
      <snapshot>
        <extension
                   url="http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version">
          <valueString value="4.0.1"/>
        </extension>
        <element id="Timing">
          <path value="Timing"/>
          <short
                 value="A timing schedule that specifies an event that may occur multiple times"/>
          <definition
                      value="Specifies an event that may occur multiple times. Timing schedules are used to record when things are planned, expected or requested to occur. The most common usage is in dosage instructions for medications. They are also used when planning care of various kinds, and may be used for reporting the schedule to which past regular activities were carried out."/>
          <comment
                   value="Describes the occurrence of an event that may occur multiple times. Timing schedules are used for specifying when events are expected or requested to occur, and may also be used to represent the summary of a past or ongoing event.  For simplicity, the definitions of Timing components are expressed as 'future' events, but such components can also be used to describe historic or ongoing events.

    A Timing schedule can be a list of events and/or criteria for when the event happens, which can be expressed in a structured form and/or as a code. When both event and a repeating specification are provided, the list of events should be understood as an interpretation of the information in the repeat structure."/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="Timing"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
          <mapping>
            <identity value="v2"/>
            <map value="N/A"/>
          </mapping>
          <mapping>
            <identity value="rim"/>
            <map value="QSET&lt;TS&gt; (GTS)"/>
          </mapping>
        </element>
        <element id="Timing.id">
          <path value="Timing.id"/>
          <representation value="xmlAttr"/>
          <short value="Unique id for inter-element referencing"/>
          <definition
                      value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
              <valueUrl value="string"/>
            </extension>
            <code value="http://hl7.org/fhirpath/System.String"/>
          </type>
          <isModifier value="false"/>
          <isSummary value="false"/>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
        </element>
        <element id="Timing.extension">
          <path value="Timing.extension"/>
          <slicing>
            <discriminator>
              <type value="value"/>
              <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
          </slicing>
          <short value="Additional content defined by implementations"/>
          <definition
                      value="May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
          <comment
                   value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
          <alias value="extensions"/>
          <alias value="user content"/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="Extension"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath
                   value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), &quot;value&quot;)])"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Extension"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="false"/>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
        </element>
        <element id="Timing.modifierExtension">
          <path value="Timing.modifierExtension"/>
          <short value="Extensions that cannot be ignored even if unrecognized"/>
          <definition
                      value="May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself)."/>
          <comment
                   value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
          <requirements
                        value="Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](http://hl7.org/fhir/R4/extensibility.html#modifierExtension)."/>
          <alias value="extensions"/>
          <alias value="user content"/>
          <alias value="modifiers"/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="BackboneElement.modifierExtension"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="Extension"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath
                   value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), &quot;value&quot;)])"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Extension"/>
          </constraint>
          <isModifier value="true"/>
          <isModifierReason
                            value="Modifier extensions are expected to modify the meaning or interpretation of the element that contains them"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
          </mapping>
        </element>
        <element id="Timing.event">
          <path value="Timing.event"/>
          <short value="When the event occurs"/>
          <definition value="Identifies specific times when the event occurs."/>
          <requirements
                        value="In a Medication Administration Record, for instance, you need to take a general specification, and turn it into a precise specification."/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="Timing.event"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="dateTime"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="QLIST&lt;TS&gt;"/>
          </mapping>
        </element>
        <element id="Timing.repeat">
          <path value="Timing.repeat"/>
          <short value="When the event is to occur"/>
          <definition
                      value="A set of rules that describe when the event is scheduled."/>
          <requirements
                        value="Many timing schedules are determined by regular repetitions."/>
          <min value="1"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="Element"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <constraint>
            <key value="tim-1"/>
            <severity value="error"/>
            <human
                   value="if there's a duration, there needs to be duration units"/>
            <expression value="duration.empty() or durationUnit.exists()"/>
            <xpath value="not(exists(f:duration)) or exists(f:durationUnit)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-2"/>
            <severity value="error"/>
            <human value="if there's a period, there needs to be period units"/>
            <expression value="period.empty() or periodUnit.exists()"/>
            <xpath value="not(exists(f:period)) or exists(f:periodUnit)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-4"/>
            <severity value="error"/>
            <human value="duration SHALL be a non-negative value"/>
            <expression value="duration.exists() implies duration &gt;= 0"/>
            <xpath value="f:duration/@value &gt;= 0 or not(f:duration/@value)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-5"/>
            <severity value="error"/>
            <human value="period SHALL be a non-negative value"/>
            <expression value="period.exists() implies period &gt;= 0"/>
            <xpath value="f:period/@value &gt;= 0 or not(f:period/@value)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-6"/>
            <severity value="error"/>
            <human value="If there's a periodMax, there must be a period"/>
            <expression value="periodMax.empty() or period.exists()"/>
            <xpath value="not(exists(f:periodMax)) or exists(f:period)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-7"/>
            <severity value="error"/>
            <human value="If there's a durationMax, there must be a duration"/>
            <expression value="durationMax.empty() or duration.exists()"/>
            <xpath value="not(exists(f:durationMax)) or exists(f:duration)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-8"/>
            <severity value="error"/>
            <human value="If there's a countMax, there must be a count"/>
            <expression value="countMax.empty() or count.exists()"/>
            <xpath value="not(exists(f:countMax)) or exists(f:count)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-9"/>
            <severity value="error"/>
            <human
                   value="If there's an offset, there must be a when (and not C, CM, CD, CV)"/>
            <expression
                        value="offset.empty() or (when.exists() and ((when in ('C' | 'CM' | 'CD' | 'CV')).not()))"/>
            <xpath value="not(exists(f:offset)) or exists(f:when)"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <constraint>
            <key value="tim-10"/>
            <severity value="error"/>
            <human
                   value="If there's a timeOfDay, there cannot be a when, or vice versa"/>
            <expression value="timeOfDay.empty() or when.empty()"/>
            <xpath value="not(exists(f:timeOfDay)) or not(exists(f:when))"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Timing"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="Implies PIVL or EIVL"/>
          </mapping>
        </element>
        <element id="Timing.repeat.id">
          <path value="Timing.repeat.id"/>
          <representation value="xmlAttr"/>
          <short value="Unique id for inter-element referencing"/>
          <definition
                      value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
              <valueUrl value="string"/>
            </extension>
            <code value="http://hl7.org/fhirpath/System.String"/>
          </type>
          <isModifier value="false"/>
          <isSummary value="false"/>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
        </element>
        <element id="Timing.repeat.extension">
          <path value="Timing.repeat.extension"/>
          <slicing>
            <discriminator>
              <type value="value"/>
              <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
          </slicing>
          <short value="Additional content defined by implementations"/>
          <definition
                      value="May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
          <comment
                   value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
          <alias value="extensions"/>
          <alias value="user content"/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="Extension"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath
                   value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), &quot;value&quot;)])"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Extension"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="false"/>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
        </element>
        <element id="Timing.repeat.bounds[x]">
          <path value="Timing.repeat.bounds[x]"/>
          <short value="Length/Range of lengths, or (Start and/or end) limits"/>
          <definition
                      value="Either a duration for the length of the timing schedule, a range of possible length, or outer bounds for start and/or end limits of the timing schedule."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.bounds[x]"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="Duration"/>
          </type>
          <type>
            <code value="Range"/>
          </type>
          <type>
            <code value="Period"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="IVL(TS) used in a QSI"/>
          </mapping>
        </element>
        <element id="Timing.repeat.count">
          <path value="Timing.repeat.count"/>
          <short value="Number of times to repeat"/>
          <definition
                      value="A total count of the desired number of repetitions across the duration of the entire timing specification. If countMax is present, this element indicates the lower bound of the allowed range of count values."/>
          <comment
                   value="If you have both bounds and count, then this should be understood as within the bounds period, until count times happens."/>
          <requirements
                        value="Repetitions may be limited by end time or total occurrences."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.count"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="positiveInt"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.count"/>
          </mapping>
        </element>
        <element id="Timing.repeat.countMax">
          <path value="Timing.repeat.countMax"/>
          <short value="Maximum number of times to repeat"/>
          <definition
                      value="If present, indicates that the count is a range - so to perform the action between [count] and [countMax] times."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.countMax"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="positiveInt"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.count"/>
          </mapping>
        </element>
        <element id="Timing.repeat.duration">
          <path value="Timing.repeat.duration"/>
          <short value="How long when it happens"/>
          <definition
                      value="How long this thing happens for when it happens. If durationMax is present, this element indicates the lower bound of the allowed range of the duration."/>
          <comment
                   value="For some events the duration is part of the definition of the event (e.g. IV infusions, where the duration is implicit in the specified quantity and rate). For others, it's part of the timing specification (e.g. exercise)."/>
          <requirements
                        value="Some activities are not instantaneous and need to be maintained for a period of time."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.duration"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="decimal"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase"/>
          </mapping>
        </element>
        <element id="Timing.repeat.durationMax">
          <path value="Timing.repeat.durationMax"/>
          <short value="How long when it happens (Max)"/>
          <definition
                      value="If present, indicates that the duration is a range - so to perform the action between [duration] and [durationMax] time length."/>
          <comment
                   value="For some events the duration is part of the definition of the event (e.g. IV infusions, where the duration is implicit in the specified quantity and rate). For others, it's part of the timing specification (e.g. exercise)."/>
          <requirements
                        value="Some activities are not instantaneous and need to be maintained for a period of time."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.durationMax"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="decimal"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase"/>
          </mapping>
        </element>
        <element id="Timing.repeat.durationUnit">
          <path value="Timing.repeat.durationUnit"/>
          <short value="s | min | h | d | wk | mo | a - unit of time (UCUM)"/>
          <definition value="The units of time for the duration, in UCUM units."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.durationUnit"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="code"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <binding>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
              <valueString value="UnitsOfTime"/>
            </extension>
            <strength value="required"/>
            <description value="A unit of time (units from UCUM)."/>
            <valueSet value="http://hl7.org/fhir/ValueSet/units-of-time|4.0.1"/>
          </binding>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase.unit"/>
          </mapping>
        </element>
        <element id="Timing.repeat.frequency">
          <path value="Timing.repeat.frequency"/>
          <short value="Event occurs frequency times per period"/>
          <definition
                      value="The number of times to repeat the action within the specified period. If frequencyMax is present, this element indicates the lower bound of the allowed range of the frequency."/>
          <min value="1"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.frequency"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="positiveInt"/>
          </type>
          <meaningWhenMissing
                              value="If no frequency is stated, the assumption is that the event occurs once per period, but systems SHOULD always be specific about this"/>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase"/>
          </mapping>
        </element>
        <element id="Timing.repeat.frequencyMax">
          <path value="Timing.repeat.frequencyMax"/>
          <short value="Event occurs up to frequencyMax times per period"/>
          <definition
                      value="If present, indicates that the frequency is a range - so to repeat between [frequency] and [frequencyMax] times within the period or period range."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.frequencyMax"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="positiveInt"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase"/>
          </mapping>
        </element>
        <element id="Timing.repeat.period">
          <path value="Timing.repeat.period"/>
          <short value="Event occurs frequency times per period"/>
          <definition
                      value="Indicates the duration of time over which repetitions are to occur; e.g. to express &quot;3 times per day&quot;, 3 would be the frequency and &quot;1 day&quot; would be the period. If periodMax is present, this element indicates the lower bound of the allowed range of the period length."/>
          <min value="1"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.period"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="decimal"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase"/>
          </mapping>
        </element>
        <element id="Timing.repeat.periodMax">
          <path value="Timing.repeat.periodMax"/>
          <short value="Upper limit of period (3-4 hours)"/>
          <definition
                      value="If present, indicates that the period is a range from [period] to [periodMax], allowing expressing concepts such as &quot;do this once every 3-5 days."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.periodMax"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="decimal"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase"/>
          </mapping>
        </element>
        <element id="Timing.repeat.periodUnit">
          <path value="Timing.repeat.periodUnit"/>
          <short value="s | min | h | d | wk | mo | a - unit of time (UCUM)"/>
          <definition value="The units of time for the period in UCUM units."/>
          <min value="1"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.periodUnit"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="code"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <binding>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
              <valueString value="UnitsOfTime"/>
            </extension>
            <strength value="required"/>
            <description value="A unit of time (units from UCUM)."/>
            <valueSet value="http://hl7.org/fhir/ValueSet/units-of-time|4.0.1"/>
          </binding>
          <mapping>
            <identity value="rim"/>
            <map value="PIVL.phase.unit"/>
          </mapping>
        </element>
        <element id="Timing.repeat.dayOfWeek">
          <path value="Timing.repeat.dayOfWeek"/>
          <short value="mon | tue | wed | thu | fri | sat | sun"/>
          <definition
                      value="If one or more days of week is provided, then the action happens only on the specified day(s)."/>
          <comment
                   value="If no days are specified, the action is assumed to happen every day as otherwise specified. The elements frequency and period cannot be used as well as dayOfWeek."/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="Timing.repeat.dayOfWeek"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="code"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <binding>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
              <valueString value="DayOfWeek"/>
            </extension>
            <strength value="required"/>
            <valueSet value="http://hl7.org/fhir/ValueSet/days-of-week|4.0.1"/>
          </binding>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
        </element>
        <element id="Timing.repeat.timeOfDay">
          <path value="Timing.repeat.timeOfDay"/>
          <short value="Time of day for action"/>
          <definition value="Specified time of day for action to take place."/>
          <comment
                   value="When time of day is specified, it is inferred that the action happens every day (as filtered by dayofWeek) on the specified times. The elements when, frequency and period cannot be used as well as timeOfDay."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.timeOfDay"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="time"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <mustSupport value="true"/>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
          </mapping>
        </element>
        <element id="Timing.repeat.when">
          <path value="Timing.repeat.when"/>
          <short value="Code for time period of occurrence"/>
          <definition
                      value="An approximate time period during the day, potentially linked to an event of daily living that indicates when the action should occur."/>
          <comment
                   value="When more than one event is listed, the event is tied to the union of the specified events."/>
          <requirements
                        value="Timings are frequently determined by occurrences such as waking, eating and sleep."/>
          <min value="0"/>
          <max value="*"/>
          <base>
            <path value="Timing.repeat.when"/>
            <min value="0"/>
            <max value="*"/>
          </base>
          <type>
            <code value="code"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <binding>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
              <valueString value="EventTiming"/>
            </extension>
            <strength value="required"/>
            <description value="Real world event relating to the schedule."/>
            <valueSet value="http://hl7.org/fhir/ValueSet/event-timing|4.0.1"/>
          </binding>
          <mapping>
            <identity value="rim"/>
            <map value="EIVL.event"/>
          </mapping>
        </element>
        <element id="Timing.repeat.offset">
          <path value="Timing.repeat.offset"/>
          <short value="Minutes from event (before or after)"/>
          <definition
                      value="The number of minutes from the event. If the event code does not indicate whether the minutes is before or after the event, then the offset is assumed to be after the event."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.repeat.offset"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="unsignedInt"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <mapping>
            <identity value="rim"/>
            <map value="EIVL.offset"/>
          </mapping>
        </element>
        <element id="Timing.code">
          <path value="Timing.code"/>
          <short value="BID | TID | QID | AM | PM | QD | QOD | +"/>
          <definition
                      value="A code for the timing schedule (or just text in code.text). Some codes such as BID are ubiquitous, but many institutions define their own additional codes. If a code is provided, the code is understood to be a complete statement of whatever is specified in the structured timing data, and either the code or the data may be used to interpret the Timing, with the exception that .repeat.bounds still applies over the code (and is not contained in the code)."/>
          <comment
                   value="BID etc. are defined as 'at institutionally specified times'. For example, an institution may choose that BID is &quot;always at 7am and 6pm&quot;.  If it is inappropriate for this choice to be made, the code BID should not be used. Instead, a distinct organization-specific code should be used in place of the HL7-defined BID code and/or a structured representation should be used (in this case, specifying the two event times)."/>
          <min value="0"/>
          <max value="1"/>
          <base>
            <path value="Timing.code"/>
            <min value="0"/>
            <max value="1"/>
          </base>
          <type>
            <code value="CodeableConcept"/>
          </type>
          <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression
                        value="hasValue() or (children().count() &gt; id.count())"/>
            <xpath value="@value|f:*|h:div"/>
            <source value="http://hl7.org/fhir/StructureDefinition/Element"/>
          </constraint>
          <isModifier value="false"/>
          <isSummary value="true"/>
          <binding>
            <extension
                       url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
              <valueString value="TimingAbbreviation"/>
            </extension>
            <strength value="preferred"/>
            <description value="Code for a known / defined timing pattern."/>
            <valueSet
                      value="http://hl7.org/fhir/ValueSet/timing-abbreviation|4.0.1"/>
          </binding>
          <mapping>
            <identity value="rim"/>
            <map value="QSC.code"/>
          </mapping>
        </element>
      </snapshot>
      <differential>
        <element id="Timing">
          <path value="Timing"/>
        </element>
        <element id="Timing.repeat">
          <path value="Timing.repeat"/>
          <min value="1"/>
          <max value="1"/>
        </element>
        <element id="Timing.repeat.frequency">
          <path value="Timing.repeat.frequency"/>
          <min value="1"/>
          <max value="1"/>
        </element>
        <element id="Timing.repeat.period">
          <path value="Timing.repeat.period"/>
          <min value="1"/>
          <max value="1"/>
        </element>
        <element id="Timing.repeat.periodUnit">
          <path value="Timing.repeat.periodUnit"/>
          <min value="1"/>
          <max value="1"/>
        </element>
        <element id="Timing.repeat.timeOfDay">
          <path value="Timing.repeat.timeOfDay"/>
          <min value="0"/>
          <max value="1"/>
          <mustSupport value="true"/>
        </element>
      </differential>
    </StructureDefinition>