<status value="draft" /> <experimental value="true" /> <date value="2019-02-10T00:11:08+00:00" /> <publisher value="HL7 FHIR Standard" /> <contact> <telecom> <system value="url" /> <value value="http://hl7.org/fhir" /> </telecom> </contact> <description value="Data Element for Element.extension" /> <purpose value="Data Elements are defined for each element to assist in questionnaire construction etc" /> <fhirVersion value="4.0.0" /> <mapping> <identity value="rim" /> <uri value="http://hl7.org/v3" /> <name value="RIM Mapping" /> </mapping> <kind value="logical" /> <abstract value="false" /> <type value="Element.extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Element" /> <derivation value="specialization" /> <snapshot> <element id="Element.extension"> <path value="Element.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> <isModifier value="false" /> <isSummary value="false" /> <mapping> <identity value="rim" /> <map value="n/a" /> </mapping> </element> </snapshot> </StructureDefinition>