Australian Digital Health Agency FHIR Implementation Guide
1.2.0-ci-build - draft Australia flag

Australian Digital Health Agency FHIR Implementation Guide, published by Australian Digital Health Agency. This guide is not an authorized publication; it is the continuous build for version 1.2.0-ci-build built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/AuDigitalHealth/ci-fhir-r4/ and changes regularly. See the Directory of published versions

Extension: ADHAHL7V2AttachmentBase64 - Detailed Descriptions

Draft as of 2024-09-12

Definitions for the dh-attachment-hl7-v2-base64-1 extension.

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition

HL7 V2 message as an attachment with the actual content conveyed directly as data inline, base64 encoded.

ShortHL7 V2 message as an attachment, data inline, base64 encoded
Control0..1
2. Extension.url
Fixed Valuehttp://ns.electronichealth.net.au/fhir/StructureDefinition/dh-attachment-hl7-v2-base64-1
4. Extension.value[x]
Definition

The actual data of the HL7 V2 message - a sequence of bytes, base64 encoded.

ShortData inline, base64ed
Control1..1
TypeAttachment, date, Meta, Address, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
6. Extension.value[x].contentType
Shortmessage is a 'vertical bar' encoded HL7 v2.x message
Control1..?
Fixed Valuex-application/hl7-v2+er7
8. Extension.value[x].data
Control1..?

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition

HL7 V2 message as an attachment with the actual content conveyed directly as data inline, base64 encoded.


Optional Extension Element - found in all resources.

ShortHL7 V2 message as an attachment, data inline, base64 encodedOptional Extensions Element
Control0..1*
This element is affected by the following invariants: ele-1
Is Modifierfalse
Invariantsele-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())
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.

Shortidentifies 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.

Control1..1
Typeuri
Is Modifierfalse
XML FormatIn the XML format, this property is represented as an attribute.
Summaryfalse
Fixed Valuehttp://ns.electronichealth.net.au/fhir/StructureDefinition/dh-attachment-hl7-v2-base64-1
4. Extension.value[x]
Definition

The actual data of the HL7 V2 message - a sequence of bytes, base64 encoded.


Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

ShortData inline, base64edValue of extension
Control10..1
TypeAttachment, date, Meta, Address, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Is Modifierfalse
Summaryfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
6. Extension.value[x].contentType
Definition

Identifies the type of the data in the attachment and allows a method to be chosen to interpret or render the data. Includes mime type parameters such as charset where appropriate.

Shortmessage is a 'vertical bar' encoded HL7 v2.x messageMime type of the content, with charset etc.
Control10..1
BindingThe codes SHALL be taken from Mime Typeshttp://hl7.org/fhir/ValueSet/mimetypes|4.0.1
(required to http://hl7.org/fhir/ValueSet/mimetypes|4.0.1)

The mime type of an attachment. Any valid mime type is allowed.

Typecode
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Processors of the data need to be able to know how to interpret the data.

Fixed Valuex-application/hl7-v2+er7
Example<br/><b>General</b>:text/plain; charset=UTF-8, image/png
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
8. Extension.value[x].data
Definition

The actual data of the attachment - a sequence of bytes, base64 encoded.

ShortData inline, base64ed
Comments

The base64-encoded data SHALL be expressed in the same character set as the base resource XML or JSON.

Control10..1
Typebase64Binary
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summaryfalse
Requirements

The data needs to able to be transmitted inline.

Invariantsele-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

HL7 V2 message as an attachment with the actual content conveyed directly as data inline, base64 encoded.

ShortHL7 V2 message as an attachment, data inline, base64 encoded
Control0..1
This element is affected by the following invariants: ele-1
Is Modifierfalse
Invariantsele-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.

ShortUnique id for inter-element referencing
Control0..1
Typestring
Is Modifierfalse
XML FormatIn the XML format, this property is represented as an attribute.
Summaryfalse
4. Extension.extension
Definition

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.

ShortAdditional 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.

Control0..*
TypeExtension
Is Modifierfalse
Summaryfalse
Alternate Namesextensions, user content
Invariantsele-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())
SlicingThis 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.

    Shortidentifies 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.

    Control1..1
    Typeuri
    Is Modifierfalse
    XML FormatIn the XML format, this property is represented as an attribute.
    Summaryfalse
    Fixed Valuehttp://ns.electronichealth.net.au/fhir/StructureDefinition/dh-attachment-hl7-v2-base64-1
    8. Extension.value[x]
    Definition

    The actual data of the HL7 V2 message - a sequence of bytes, base64 encoded.

    ShortData inline, base64ed
    Control1..1
    TypeAttachment
    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
    Is Modifierfalse
    Summaryfalse
    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
    10. Extension.value[x].id
    Definition

    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

    ShortUnique id for inter-element referencing
    Control0..1
    Typestring
    Is Modifierfalse
    XML FormatIn the XML format, this property is represented as an attribute.
    Summaryfalse
    12. Extension.value[x].extension
    Definition

    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.

    ShortAdditional 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.

    Control0..*
    TypeExtension
    Is Modifierfalse
    Summaryfalse
    Alternate Namesextensions, user content
    Invariantsele-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())
    SlicingThis element introduces a set of slices on Extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
    • value @ url
    • 14. Extension.value[x].contentType
      Definition

      Identifies the type of the data in the attachment and allows a method to be chosen to interpret or render the data. Includes mime type parameters such as charset where appropriate.

      Shortmessage is a 'vertical bar' encoded HL7 v2.x message
      Control1..1
      BindingThe codes SHALL be taken from Mime Types
      (required to http://hl7.org/fhir/ValueSet/mimetypes|4.0.1)

      The mime type of an attachment. Any valid mime type is allowed.

      Typecode
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      Processors of the data need to be able to know how to interpret the data.

      Fixed Valuex-application/hl7-v2+er7
      Example<br/><b>General</b>:text/plain; charset=UTF-8, image/png
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      16. Extension.value[x].language
      Definition

      The human language of the content. The value can be any valid value according to BCP 47.

      ShortHuman language of the content (BCP-47)
      Control0..1
      BindingThe codes SHOULD be taken from CommonLanguages
      (preferred to http://hl7.org/fhir/ValueSet/languages)

      A human language.

      Additional BindingsPurpose
      AllLanguagesMax Binding
      Typecode
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      Users need to be able to choose between the languages in a set of attachments.

      Example<br/><b>General</b>:en-AU
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      18. Extension.value[x].data
      Definition

      The actual data of the attachment - a sequence of bytes, base64 encoded.

      ShortData inline, base64ed
      Comments

      The base64-encoded data SHALL be expressed in the same character set as the base resource XML or JSON.

      Control1..1
      Typebase64Binary
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summaryfalse
      Requirements

      The data needs to able to be transmitted inline.

      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      20. Extension.value[x].url
      Definition

      A location where the data can be accessed.

      ShortUri where the data can be found
      Comments

      If both data and url are provided, the url SHALL point to the same content as the data contains. Urls may be relative references or may reference transient locations such as a wrapping envelope using cid: though this has ramifications for using signatures. Relative URLs are interpreted relative to the service url, like a resource reference, rather than relative to the resource itself. If a URL is provided, it SHALL resolve to actual data.

      Control0..1
      Typeurl
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      The data needs to be transmitted by reference.

      Example<br/><b>General</b>:http://www.acme.com/logo-small.png
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      22. Extension.value[x].size
      Definition

      The number of bytes of data that make up this attachment (before base64 encoding, if that is done).

      ShortNumber of bytes of content (if url provided)
      Comments

      The number of bytes is redundant if the data is provided as a base64binary, but is useful if the data is provided as a url reference.

      Control0..1
      TypeunsignedInt
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      Representing the size allows applications to determine whether they should fetch the content automatically in advance, or refuse to fetch it at all.

      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      24. Extension.value[x].hash
      Definition

      The calculated hash of the data using SHA-1. Represented using base64.

      ShortHash of the data (sha-1, base64ed)
      Comments

      The hash is calculated on the data prior to base64 encoding, if the data is based64 encoded. The hash is not intended to support digital signatures. Where protection against malicious threats a digital signature should be considered, see Provenance.signature for mechanism to protect a resource with a digital signature.

      Control0..1
      Typebase64Binary
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      Included so that applications can verify that the contents of a location have not changed due to technical failures (e.g., storage rot, transport glitch, incorrect version).

      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      26. Extension.value[x].title
      Definition

      A label or set of text to display in place of the data.

      ShortLabel to display in place of the data
      Control0..1
      Typestring
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      Applications need a label to display to a human user in place of the actual data if the data cannot be rendered or perceived by the viewer.

      Example<br/><b>General</b>:Official Corporate Logo
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      28. Extension.value[x].creation
      Definition

      The date that the attachment was first created.

      ShortDate attachment was first created
      Control0..1
      TypedateTime
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summarytrue
      Requirements

      This is often tracked as an integrity issue for use of the attachment.

      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))