This page is part of the HL7 Version 2 to FHIR (v1.0.0-ballot: STU1 Ballot 1) based on FHIR (HL7® FHIR® Standard) R4. . For a full list of available versions, see the Directory of published versions
Active as of 2023-12-19 |
@prefix fhir: <http://hl7.org/fhir/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
# - resource -------------------------------------------------------------------
a fhir:ConceptMap ;
fhir:nodeRole fhir:treeRoot ;
fhir:id [ fhir:v "segment-sft-to-device"] ; #
fhir:text [
fhir:status [ fhir:v "extensions" ] ;
fhir:div "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p>Mapping from SFT to <a href=\"http://hl7.org/fhir/R4/device.html\">Device</a></p><p>ACTIVE (not intended for production usage). Published on 2023-12-19 by HL7 International / Orders and Observations (HL7 Orders and Observations Workgroup: <a href=\"http://www.hl7.org/Special/committees/orders\">http://www.hl7.org/Special/com...</a>, Keith W. Boone: <a href=\"mailto:kboone@ainq.com\">kboone@ainq.com</a>, Rob Hausam: <a href=\"mailto:rrhausam@gmail.com\">rrhausam@gmail.com</a>). Copyright (c) 2020, HL7 International, Inc., All Rights Reserved.</p><div><p>This ConceptMap represents a mapping from the HL7 V2 Segment SFT to the FHIR Device Resource.</p>\n</div><br/><p><b>Group 1</b>Mapping from <code>unspecified code system</code> to <code>unspecified code system</code></p><table class=\"grid\"><tr><td colspan=\"4\"><b>Source Concept Details</b></td><td><b>Relationship</b></td><td colspan=\"3\"><b>Target Concept Details</b></td><td colspan=\"3\"><b>Properties</b></td></tr><tr><td colspan=\"2\"><b>Codes</b> from </td><td><b>datatypemap</b></td><td><b>value</b></td><td/><td colspan=\"2\"><b>Codes</b> from </td><td><b>antlr</b></td></tr><tr><td style=\"border-right-width: 0px\">SFT-1</td><td style=\"border-left-width: 0px\">Software Vendor Organization</td><td>XON[string]</td><td/><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">manufacturer</td><td style=\"border-left-width: 0px\">manufacturer</td><td>If XON.1 IS VALUED AND XON.10 NOT VALUED</td></tr><tr><td style=\"border-right-width: 0px\">SFT-2</td><td style=\"border-left-width: 0px\">Software Certified Version or Release Number</td><td/><td/><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">version.value</td><td style=\"border-left-width: 0px\">version.value</td><td/></tr><tr><td style=\"border-right-width: 0px\">SFT-3</td><td style=\"border-left-width: 0px\">Software Product Name</td><td/><td/><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">deviceName.name</td><td style=\"border-left-width: 0px\">deviceName.name</td><td/></tr><tr><td style=\"border-right-width: 0px\">SFT-3</td><td style=\"border-left-width: 0px\">Software Product Name</td><td/><td>"manufacturer-name"</td><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">deviceName.type</td><td style=\"border-left-width: 0px\">deviceName.type</td><td/></tr><tr><td style=\"border-right-width: 0px\">SFT-4</td><td style=\"border-left-width: 0px\">Software Binary ID</td><td/><td/><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">modelNumber</td><td style=\"border-left-width: 0px\">modelNumber</td><td/></tr><tr><td style=\"border-right-width: 0px\">SFT-5</td><td style=\"border-left-width: 0px\">Software Product Information</td><td/><td/><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">note.text</td><td style=\"border-left-width: 0px\">note.text</td><td/></tr><tr><td style=\"border-right-width: 0px\">SFT-6</td><td style=\"border-left-width: 0px\">Software Install Date</td><td/><td>"https://hl7.org/fhir/R5/StructureDefinition/extension-Device.version.installDate"</td><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">version.extension[1].url</td><td style=\"border-left-width: 0px\">version.extension[1].url</td><td/></tr><tr><td style=\"border-right-width: 0px\">SFT-6</td><td style=\"border-left-width: 0px\">Software Install Date</td><td>DTM[DateTime]</td><td/><td><a href=\"http://hl7.org/fhir/R4/codesystem-concept-map-equivalence.html#equivalent\" title=\"equivalent\">is equivalent to</a></td><td style=\"border-right-width: 0px\">version.extension[1].valueDateTime</td><td style=\"border-left-width: 0px\">version.extension[1].valueDateTime</td><td/></tr></table></div>"
] ; #
fhir:extension ( [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "derived-from" ] ] [
fhir:url [ fhir:v "label"^^xsd:anyURI ] ;
fhir:value [ fhir:v "Segment SFT to Device.fsh" ] ] [
fhir:url [ fhir:v "url"^^xsd:anyURI ] ;
fhir:value [ fhir:v "https://docs.google.com/spreadsheets/d/1wSSB1L4LrwVFEqDYzoB6zv4Iuvsh3YxhxNBPq2oB4g8/edit#gid=0"^^xsd:anyURI ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/RelatedArtifact"^^xsd:anyURI ]
] [
fhir:url [ fhir:v "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"^^xsd:anyURI ] ;
fhir:value [ fhir:v "oo" ]
] ) ; #
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/segment-sft-to-device"^^xsd:anyURI] ; #
fhir:version [ fhir:v "1.0.0-ballot"] ; #
fhir:name [ fhir:v "SegmentSFTToDevice"] ; #
fhir:title [ fhir:v "Segment SFT to Device Map"] ; #
fhir:status [ fhir:v "active"] ; #
fhir:experimental [ fhir:v "true"^^xsd:boolean] ; #
fhir:date [ fhir:v "2023-12-19"^^xsd:date] ; #
fhir:publisher [ fhir:v "HL7 International / Orders and Observations"] ; #
fhir:contact ( [
fhir:name [ fhir:v "HL7 Orders and Observations Workgroup" ] ;
( fhir:telecom [
fhir:system [ fhir:v "url" ] ;
fhir:value [ fhir:v "http://www.hl7.org/Special/committees/orders" ] ] )
] [
fhir:name [ fhir:v "Keith W. Boone" ] ;
( fhir:telecom [
fhir:system [ fhir:v "email" ] ;
fhir:value [ fhir:v "kboone@ainq.com" ] ] )
] [
fhir:name [ fhir:v "Rob Hausam" ] ;
( fhir:telecom [
fhir:system [ fhir:v "email" ] ;
fhir:value [ fhir:v "rrhausam@gmail.com" ] ] )
] ) ; #
fhir:description [ fhir:v "This ConceptMap represents a mapping from the HL7 V2 Segment SFT to the FHIR Device Resource."] ; #
fhir:jurisdiction ( [
( fhir:coding [
fhir:system [ fhir:v "http://unstats.un.org/unsd/methods/m49/m49.htm"^^xsd:anyURI ] ;
fhir:code [ fhir:v "001" ] ] )
] ) ; #
fhir:copyright [ fhir:v "Copyright (c) 2020, HL7 International, Inc., All Rights Reserved."] ; #
fhir:source [ fhir:v "SFT"^^xsd:anyURI] ; #
fhir:target [ fhir:v "Device"^^xsd:anyURI] ; #
fhir:group ( [
( fhir:element [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "XON" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-1" ] ;
fhir:display [ fhir:v "Software Vendor Organization" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "string" ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "manufacturer" ] ;
fhir:display [ fhir:v "manufacturer" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ;
( fhir:dependsOn [
fhir:property [ fhir:v "data-type-map"^^xsd:anyURI ] ;
fhir:value [ fhir:v "XON[string]" ] ] ) ;
( fhir:product [
fhir:property [ fhir:v "antlr"^^xsd:anyURI ] ;
fhir:value [ fhir:v "If XON.1 IS VALUED AND XON.10 NOT VALUED" ] ] ) ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "ST" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-2" ] ;
fhir:display [ fhir:v "Software Certified Version or Release Number" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "string" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "version.value" ] ;
fhir:display [ fhir:v "version.value" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "ST" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-3" ] ;
fhir:display [ fhir:v "Software Product Name" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "string" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "deviceName.name" ] ;
fhir:display [ fhir:v "deviceName.name" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "ST" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-3" ] ;
fhir:display [ fhir:v "Software Product Name" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "code" ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "deviceName.type" ] ;
fhir:display [ fhir:v "deviceName.type" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ;
( fhir:dependsOn [
fhir:property [ fhir:v "value"^^xsd:anyURI ] ;
fhir:value [ fhir:v "\"manufacturer-name\"" ] ] ) ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "ST" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-4" ] ;
fhir:display [ fhir:v "Software Binary ID" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "string" ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "modelNumber" ] ;
fhir:display [ fhir:v "modelNumber" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "TX" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-5" ] ;
fhir:display [ fhir:v "Software Product Information" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "markdown" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "note.text" ] ;
fhir:display [ fhir:v "note.text" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "DTM" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-6" ] ;
fhir:display [ fhir:v "Software Install Date" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "uri" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "version.extension[1].url" ] ;
fhir:display [ fhir:v "version.extension[1].url" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ;
( fhir:dependsOn [
fhir:property [ fhir:v "value"^^xsd:anyURI ] ;
fhir:value [ fhir:v "\"https://hl7.org/fhir/R5/StructureDefinition/extension-Device.version.installDate\"" ] ] ) ] ) ] [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "DTM" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
fhir:code [ fhir:v "SFT-6" ] ;
fhir:display [ fhir:v "Software Install Date" ] ;
( fhir:_target [
( fhir:extension [
( fhir:extension [
fhir:url [ fhir:v "type"^^xsd:anyURI ] ;
fhir:value [ fhir:v "dateTime" ] ] [
fhir:url [ fhir:v "cardinalityMin"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] [
fhir:url [ fhir:v "cardinalityMax"^^xsd:anyURI ] ;
fhir:value [ fhir:v "1"^^xsd:integer ] ] ) ;
fhir:url [ fhir:v "http://hl7.org/fhir/uv/v2mappings/StructureDefinition/TypeInfo"^^xsd:anyURI ] ] ) ;
( fhir:modifierExtension [
fhir:url [ fhir:v "http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence"^^xsd:anyURI ] ;
fhir:value [ fhir:v "equivalent" ] ] ) ;
fhir:code [ fhir:v "version.extension[1].valueDateTime" ] ;
fhir:display [ fhir:v "version.extension[1].valueDateTime" ] ;
fhir:equivalence [ fhir:v "equivalent" ] ;
( fhir:dependsOn [
fhir:property [ fhir:v "data-type-map"^^xsd:anyURI ] ;
fhir:value [ fhir:v "DTM[DateTime]" ] ] ) ] ) ] )
] ) . #
IG © 2020+ HL7 International / Orders and Observations. Package hl7.fhir.uv.v2mappings#1.0.0-ballot based on FHIR 4.0.1. Generated 2023-12-20
Links: Table of Contents |
QA Report
| Version History |
|
Propose a change