FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.2.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions
Guidance on how to interpret the contents of this table can be found here
0. Extension
Definition
Specifies the expansion parameters that should be used to expand ValueSets referenced from artifacts in the Library or ImplementationGuide.
Optional Extension Element - found in all resources.
Short
What expansion rulesOptional Extensions Element
Comments
Expansion parameters specified in an ImplementationGuide override expansion parameters specified in dependency IGs, and can in turn be overridden by expansion parameters specified in downstream IGs, where override in this context means a complete replacement (i.e. there is no attempt to merge parameters from upstream implementation guides). When this extension is used, it is intended to be binding (i.e. expansion SHALL take the expansion parameters into account, according to the Expansion Rules discussed in the CRMI Artifact Terminology Service Expansion Rules topic.
ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.url
Definition
Source of the definition for the extension code - a logical name or a URL.
Short
identifies the meaning of the extension
Comments
The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
Guidance on how to interpret the contents of this table can be found here
0. Extension
Definition
Specifies the expansion parameters that should be used to expand ValueSets referenced from artifacts in the Library or ImplementationGuide.
Short
What expansion rules
Comments
Expansion parameters specified in an ImplementationGuide override expansion parameters specified in dependency IGs, and can in turn be overridden by expansion parameters specified in downstream IGs, where override in this context means a complete replacement (i.e. there is no attempt to merge parameters from upstream implementation guides). When this extension is used, it is intended to be binding (i.e. expansion SHALL take the expansion parameters into account, according to the Expansion Rules discussed in the CRMI Artifact Terminology Service Expansion Rules topic.
Guidance on how to interpret the contents of this table can be found here
0. Extension
Definition
Specifies the expansion parameters that should be used to expand ValueSets referenced from artifacts in the Library or ImplementationGuide.
Short
What expansion rules
Comments
Expansion parameters specified in an ImplementationGuide override expansion parameters specified in dependency IGs, and can in turn be overridden by expansion parameters specified in downstream IGs, where override in this context means a complete replacement (i.e. there is no attempt to merge parameters from upstream implementation guides). When this extension is used, it is intended to be binding (i.e. expansion SHALL take the expansion parameters into account, according to the Expansion Rules discussed in the CRMI Artifact Terminology Service Expansion Rules topic.
ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.id
Definition
Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
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 managable, 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.
Short
Additional content defined by implementations
Comments
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.
ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
value @ url
6. Extension.url
Definition
Source of the definition for the extension code - a logical name or a URL.
Short
identifies the meaning of the extension
Comments
The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
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