Release 5 Preview #2
FoundationThis page is part of the FHIR Specification (v4.4.0: R5 Preview #2). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions 
. Page versions: R5 R4B R4 R3 R2
| Modeling and Methodology Work Group | Maturity Level: N/A | Standards Status: Informative |
Raw JSON (canonical form + also see JSON Format Specification)
StructureDefinition for Ratio
{
"resourceType" : "StructureDefinition",
"id" : "Ratio",
"meta" : {
"lastUpdated" : "2020-05-03T08:43:35.811+10:00"
},
"text" : {
"status" : "generated",
"div" : "<div>!-- Snipped for Brevity --></div>"
},
"extension" : [{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
"valueCode" : "normative"
},
{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
"valueCode" : "4.0.0"
}],
"url" : "http://hl7.org/fhir/StructureDefinition/Ratio",
"version" : "4.4.0",
"name" : "Ratio",
"status" : "active",
"date" : "2020-05-03T08:43:35+10:00",
"publisher" : "HL7 FHIR Standard",
"contact" : [{
"telecom" : [{
"system" : "url",
"value" : "http://hl7.org/fhir"
}]
}],
"description" : "Base StructureDefinition for Ratio Type: A relationship of two Quantity values - expressed as a numerator and a denominator.",
"purpose" : "Need to able to capture ratios for some measurements (titers) and some rates (costs).",
"fhirVersion" : "4.4.0",
"mapping" : [{
"identity" : "v2",
"uri" : "http://hl7.org/v2",
"name" : "HL7 v2 Mapping"
},
{
"identity" : "rim",
"uri" : "http://hl7.org/v3",
"name" : "RIM Mapping"
}],
"kind" : "complex-type",
"abstract" : false,
"type" : "Ratio",
"baseDefinition" : "http://hl7.org/fhir/StructureDefinition/DataType",
"derivation" : "specialization",
"snapshot" : {
"element" : [{
"id" : "Ratio",
"extension" : [{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
"valueCode" : "normative"
},
{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
"valueCode" : "4.0.0"
}],
"path" : "Ratio",
"short" : "A ratio of two Quantity values - a numerator and a denominator",
"definition" : "A relationship of two Quantity values - expressed as a numerator and a denominator.",
"comment" : "The Ratio datatype should only be used to express a relationship of two numbers if the relationship cannot be suitably expressed using a Quantity and a common unit. Where the denominator value is known to be fixed to \"1\", Quantity should be used instead of Ratio.",
"min" : 0,
"max" : "*",
"base" : {
"path" : "Ratio",
"min" : 0,
"max" : "*"
},
"constraint" : [{
"key" : "ele-1",
"severity" : "error",
"human" : "All FHIR elements must have a @value or children",
"expression" : "hasValue() or (children().count() > id.count())",
"xpath" : "@value|f:*|h:div",
"source" : "http://hl7.org/fhir/StructureDefinition/Element"
},
{
"key" : "rat-1",
"severity" : "error",
"human" : "Numerator and denominator SHALL both be present, or both are absent. If both are absent, there SHALL be some extension present",
"expression" : "(numerator.empty() xor denominator.exists()) and (numerator.exists() or extension.exists())",
"xpath" : "(count(f:numerator) = count(f:denominator)) and ((count(f:numerator) > 0) or (count(f:extension) > 0))",
"source" : "http://hl7.org/fhir/StructureDefinition/null"
}],
"isModifier" : false,
"mapping" : [{
"identity" : "rim",
"map" : "n/a"
},
{
"identity" : "v2",
"map" : "N/A"
},
{
"identity" : "rim",
"map" : "RTO"
}]
},
{
"id" : "Ratio.id",
"path" : "Ratio.id",
"representation" : ["xmlAttr"],
"short" : "Unique id for inter-element referencing",
"definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
"min" : 0,
"max" : "1",
"base" : {
"path" : "Element.id",
"min" : 0,
"max" : "1"
},
"type" : [{
"extension" : [{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
"valueUri" : "string"
}],
"code" : "http://hl7.org/fhirpath/System.String"
}],
"isModifier" : false,
"isSummary" : false,
"mapping" : [{
"identity" : "rim",
"map" : "n/a"
}]
},
{
"id" : "Ratio.extension",
"path" : "Ratio.extension",
"slicing" : {
"discriminator" : [{
"type" : "value",
"path" : "url"
}],
"description" : "Extensions are always sliced by (at least) url",
"rules" : "open"
},
"short" : "Additional content defined by implementations",
"definition" : "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" : "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" : ["extensions",
"user content"],
"min" : 0,
"max" : "*",
"base" : {
"path" : "Element.extension",
"min" : 0,
"max" : "*"
},
"type" : [{
"code" : "Extension"
}],
"constraint" : [{
"key" : "ele-1",
"severity" : "error",
"human" : "All FHIR elements must have a @value or children",
"expression" : "hasValue() or (children().count() > id.count())",
"xpath" : "@value|f:*|h:div",
"source" : "http://hl7.org/fhir/StructureDefinition/Element"
},
{
"key" : "ext-1",
"severity" : "error",
"human" : "Must have either extensions or value[x], not both",
"expression" : "extension.exists() != value.exists()",
"xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
"source" : "http://hl7.org/fhir/StructureDefinition/Extension"
}],
"isModifier" : false,
"isSummary" : false,
"mapping" : [{
"identity" : "rim",
"map" : "n/a"
}]
},
{
"id" : "Ratio.numerator",
"path" : "Ratio.numerator",
"short" : "Numerator value",
"definition" : "The value of the numerator.",
"min" : 0,
"max" : "1",
"base" : {
"path" : "Ratio.numerator",
"min" : 0,
"max" : "1"
},
"type" : [{
"code" : "Quantity"
}],
"constraint" : [{
"key" : "ele-1",
"severity" : "error",
"human" : "All FHIR elements must have a @value or children",
"expression" : "hasValue() or (children().count() > id.count())",
"xpath" : "@value|f:*|h:div",
"source" : "http://hl7.org/fhir/StructureDefinition/Element"
}],
"isModifier" : false,
"isSummary" : true,
"mapping" : [{
"identity" : "rim",
"map" : ".numerator"
}]
},
{
"id" : "Ratio.denominator",
"path" : "Ratio.denominator",
"short" : "Denominator value",
"definition" : "The value of the denominator.",
"min" : 0,
"max" : "1",
"base" : {
"path" : "Ratio.denominator",
"min" : 0,
"max" : "1"
},
"type" : [{
"code" : "Quantity"
}],
"constraint" : [{
"key" : "ele-1",
"severity" : "error",
"human" : "All FHIR elements must have a @value or children",
"expression" : "hasValue() or (children().count() > id.count())",
"xpath" : "@value|f:*|h:div",
"source" : "http://hl7.org/fhir/StructureDefinition/Element"
}],
"isModifier" : false,
"isSummary" : true,
"mapping" : [{
"identity" : "rim",
"map" : ".denominator"
}]
}]
},
"differential" : {
"element" : [{
"id" : "Ratio",
"extension" : [{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
"valueCode" : "normative"
},
{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
"valueCode" : "4.0.0"
}],
"path" : "Ratio",
"short" : "A ratio of two Quantity values - a numerator and a denominator",
"definition" : "A relationship of two Quantity values - expressed as a numerator and a denominator.",
"comment" : "The Ratio datatype should only be used to express a relationship of two numbers if the relationship cannot be suitably expressed using a Quantity and a common unit. Where the denominator value is known to be fixed to \"1\", Quantity should be used instead of Ratio.",
"min" : 0,
"max" : "*",
"constraint" : [{
"key" : "rat-1",
"severity" : "error",
"human" : "Numerator and denominator SHALL both be present, or both are absent. If both are absent, there SHALL be some extension present",
"expression" : "(numerator.empty() xor denominator.exists()) and (numerator.exists() or extension.exists())",
"xpath" : "(count(f:numerator) = count(f:denominator)) and ((count(f:numerator) > 0) or (count(f:extension) > 0))",
"source" : "http://hl7.org/fhir/StructureDefinition/null"
}],
"mapping" : [{
"identity" : "v2",
"map" : "N/A"
},
{
"identity" : "rim",
"map" : "RTO"
}]
},
{
"id" : "Ratio.numerator",
"path" : "Ratio.numerator",
"short" : "Numerator value",
"definition" : "The value of the numerator.",
"min" : 0,
"max" : "1",
"type" : [{
"code" : "Quantity"
}],
"isSummary" : true,
"mapping" : [{
"identity" : "rim",
"map" : ".numerator"
}]
},
{
"id" : "Ratio.denominator",
"path" : "Ratio.denominator",
"short" : "Denominator value",
"definition" : "The value of the denominator.",
"min" : 0,
"max" : "1",
"type" : [{
"code" : "Quantity"
}],
"isSummary" : true,
"mapping" : [{
"identity" : "rim",
"map" : ".denominator"
}]
}]
}
}
Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.
FHIR ®© HL7.org 2011+. FHIR CI Build hl7.fhir.core#4.4.0 generated on Sun, May 3, 2020 08:46+1000.
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