{"abstract":false,"baseDefinition":"http://hl7.org/fhir/StructureDefinition/Extension","contact":[{"telecom":[{"system":"url","value":"http://www.hl7.org/Special/committees/cqi/index.cfm"}]}],"context":[{"expression":"Composition","type":"element"}],"date":"2014-01-31","derivation":"constraint","description":"The period in which the catalog is valid.","differential":{"element":[{"definition":"The period in which the catalog is valid.","id":"Extension","max":"1","min":1,"path":"Extension","short":"Validity Period"},{"id":"Extension.extension","max":"0","path":"Extension.extension"},{"fixedUri":"http://hl7.org/fhir/StructureDefinition/cqm-ValidityPeriod","id":"Extension.url","path":"Extension.url"},{"id":"Extension.value[x]","min":1,"path":"Extension.value[x]","type":[{"code":"dateTime"}]}]},"extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-wg","valueCode":"sd"},{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm","valueInteger":1}],"fhirVersion":"4.2.0","id":"cqm-ValidityPeriod","kind":"complex-type","mapping":[{"identity":"rim","name":"RIM Mapping","uri":"http://hl7.org/v3"}],"name":"ValidityPeriod","publisher":"Health Level Seven, Inc. - Clinical Quality Information WG","resourceType":"StructureDefinition","snapshot":{"element":[{"base":{"max":"*","min":0,"path":"Extension"},"constraint":[{"expression":"hasValue() or (children().count() > id.count())","human":"All FHIR elements must have a @value or children","key":"ele-1","severity":"error","source":"Element","xpath":"@value|f:*|h:div"},{"expression":"extension.exists() != value.exists()","human":"Must have either extensions or value[x], not both","key":"ext-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Extension","xpath":"exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"}],"definition":"The period in which the catalog is valid.","id":"Extension","isModifier":false,"max":"1","min":1,"path":"Extension","short":"Validity Period"},{"base":{"max":"1","min":0,"path":"Element.id"},"definition":"Unique id for the element within a resource (for internal references). 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