How for I search fhir resources based on extension values?
问题 I have a set of fhir resources in the following form: <Basic> <meta> <versionId value="1.0"/> <lastUpdated value="2016-11-18T10:26:51Z"/> <profile value="http://stelar.org/StructureDefinition/stelar/profile/anthropometry"/> </meta> <text> <status value="generated"/> </text> <extension url="http://stelar.org/StructureDefinition/stelar/extension/const-sourceIdentifier"> <cohortName value="TEST"/> <datasetName value="SEATONJEAug14A1"/> <archetypeName value="Abdo20wks"/> </extension> <extension