Smart4Health Implementation Guide

Attachment

Profile status: Draft
Canonical URL: http://fhir.smart4health.eu/StructureDefinition/s4h-attachment

Mandatory and must-support data elements

A valid instance according to this profile must satisfy the following constraints:

a MIME-type (element: contentType) - Smart4Health constraint, to support targeted security-related check on content.

In addition, 4 top-level elements are marked as must-support.

Additional business rules

If the hash element is filled, the hash will be checked upon upload and the resource rejected if the hash is incorrect. This business rule cannot be enforced by the profile.

Examples

For examples of S4H-conformant attachments, see the examples for the DocumentReference profile.

Formal views of profile content

Differential view

Shows only differences relative to the base resource definition.

Attachment	I		Attachment	There are no (further) constraints on this element Element id Attachment Short description Content in a format defined elsewhere Definition For referring to data content defined in other formats. Comments When providing a summary view (for example with Observation.value[x]) Attachment should be represented with a brief display text such as "Signed Procedure Consent". Data type Attachment Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` att-1: If the Attachment has data, it SHALL have a contentType `data.empty() or contentType.exists()` Mappings rim: n/a v2: ED/RP rim: ED
id		0..1	string	There are no (further) constraints on this element Element id Attachment.id Short description Unique id for inter-element referencing Definition Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. Data type string Mappings rim: n/a
extension	I	0..*	Extension	There are no (further) constraints on this element Element id Attachment.extension Short description Additional content defined by implementations Alternate names extensions, user content 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. 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. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints 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()` Mappings rim: n/a rim: N/A
contentType	S Σ	1..1	codeBinding	There are no (further) constraints on this element Element id Attachment.contentType Short description Mime type of the content, with charset etc. 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. Requirements Processors of the data need to be able to know how to interpret the data. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding The mime type of an attachment. Any valid mime type is allowed. Mime Types (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General text/plain; charset=UTF-8, image/png Mappings rim: n/a v2: ED.2+ED.3/RP.2+RP.3. Note conversion may be needed if old style values are being used rim: ./mediaType, ./charset
language	Σ	0..1	codeBinding	There are no (further) constraints on this element Element id Attachment.language Short description Human language of the content (BCP-47) Definition The human language of the content. The value can be any valid value according to BCP 47. Requirements Users need to be able to choose between the languages in a set of attachments. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding A human language. CommonLanguages (preferred) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General en-AU Mappings rim: n/a rim: ./language
data	S	0..1	base64Binary	There are no (further) constraints on this element Element id Attachment.data Short description Data inline, base64ed Definition The actual data of the attachment - a sequence of bytes, base64 encoded. Requirements The data needs to able to be transmitted inline. Comments The base64-encoded data SHALL be expressed in the same character set as the base resource XML or JSON. Data type base64Binary Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: ED.5 rim: ./data
url	S Σ	0..1	url	Element id Attachment.url Short description Uri where the data can be found Definition A location where the data can be accessed. Requirements The data needs to be transmitted by reference. Smart4Health-specific constraint: attachment must declare their content type to allow security-related checks on the content. 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. Data type url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General http://www.acme.com/logo-small.png Mappings rim: n/a v2: RP.1+RP.2 - if they refer to a URL (see v2.6) rim: ./reference/literal
size	Σ	0..1	unsignedInt	There are no (further) constraints on this element Element id Attachment.size Short description Number of bytes of content (if url provided) Definition The number of bytes of data that make up this attachment (before base64 encoding, if that is done). Requirements Representing the size allows applications to determine whether they should fetch the content automatically in advance, or refuse to fetch it at all. 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. Data type unsignedInt Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A (needs data type R3 proposal)
hash	S Σ	0..1	base64Binary	There are no (further) constraints on this element Element id Attachment.hash Short description Hash of the data (sha-1, base64ed) Definition The calculated hash of the data using SHA-1. Represented using base64. 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). 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. Data type base64Binary Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: .integrityCheck[parent::ED/integrityCheckAlgorithm="SHA-1"]
title	Σ	0..1	string	There are no (further) constraints on this element Element id Attachment.title Short description Label to display in place of the data Definition A label or set of text to display in place of the data. 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. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General Official Corporate Logo Mappings rim: n/a rim: ./title/data
creation	S Σ	0..1	dateTime	There are no (further) constraints on this element Element id Attachment.creation Short description Date attachment was first created Definition The date that the attachment was first created. Requirements This is often tracked as an integrity issue for use of the attachment. Data type dateTime Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A (needs data type R3 proposal)

Snapshot view

Shows all constraints, including those from underlying profiles and the base resource definition.

Attachment	I		Attachment	There are no (further) constraints on this element Element id Attachment Short description Content in a format defined elsewhere Definition For referring to data content defined in other formats. Comments When providing a summary view (for example with Observation.value[x]) Attachment should be represented with a brief display text such as "Signed Procedure Consent". Data type Attachment Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` att-1: If the Attachment has data, it SHALL have a contentType `data.empty() or contentType.exists()` Mappings rim: n/a v2: ED/RP rim: ED
id		0..1	string	There are no (further) constraints on this element Element id Attachment.id Short description Unique id for inter-element referencing Definition Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. Data type string Mappings rim: n/a
extension	I	0..*	Extension	There are no (further) constraints on this element Element id Attachment.extension Short description Additional content defined by implementations Alternate names extensions, user content 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. 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. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints 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()` Mappings rim: n/a rim: N/A
contentType	S Σ	1..1	codeBinding	There are no (further) constraints on this element Element id Attachment.contentType Short description Mime type of the content, with charset etc. 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. Requirements Processors of the data need to be able to know how to interpret the data. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding The mime type of an attachment. Any valid mime type is allowed. Mime Types (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General text/plain; charset=UTF-8, image/png Mappings rim: n/a v2: ED.2+ED.3/RP.2+RP.3. Note conversion may be needed if old style values are being used rim: ./mediaType, ./charset
language	Σ	0..1	codeBinding	There are no (further) constraints on this element Element id Attachment.language Short description Human language of the content (BCP-47) Definition The human language of the content. The value can be any valid value according to BCP 47. Requirements Users need to be able to choose between the languages in a set of attachments. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding A human language. CommonLanguages (preferred) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General en-AU Mappings rim: n/a rim: ./language
data	S	0..1	base64Binary	There are no (further) constraints on this element Element id Attachment.data Short description Data inline, base64ed Definition The actual data of the attachment - a sequence of bytes, base64 encoded. Requirements The data needs to able to be transmitted inline. Comments The base64-encoded data SHALL be expressed in the same character set as the base resource XML or JSON. Data type base64Binary Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: ED.5 rim: ./data
url	S Σ	0..1	url	Element id Attachment.url Short description Uri where the data can be found Definition A location where the data can be accessed. Requirements The data needs to be transmitted by reference. Smart4Health-specific constraint: attachment must declare their content type to allow security-related checks on the content. 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. Data type url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General http://www.acme.com/logo-small.png Mappings rim: n/a v2: RP.1+RP.2 - if they refer to a URL (see v2.6) rim: ./reference/literal
size	Σ	0..1	unsignedInt	There are no (further) constraints on this element Element id Attachment.size Short description Number of bytes of content (if url provided) Definition The number of bytes of data that make up this attachment (before base64 encoding, if that is done). Requirements Representing the size allows applications to determine whether they should fetch the content automatically in advance, or refuse to fetch it at all. 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. Data type unsignedInt Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A (needs data type R3 proposal)
hash	S Σ	0..1	base64Binary	There are no (further) constraints on this element Element id Attachment.hash Short description Hash of the data (sha-1, base64ed) Definition The calculated hash of the data using SHA-1. Represented using base64. 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). 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. Data type base64Binary Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: .integrityCheck[parent::ED/integrityCheckAlgorithm="SHA-1"]
title	Σ	0..1	string	There are no (further) constraints on this element Element id Attachment.title Short description Label to display in place of the data Definition A label or set of text to display in place of the data. 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. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Examples General Official Corporate Logo Mappings rim: n/a rim: ./title/data
creation	S Σ	0..1	dateTime	There are no (further) constraints on this element Element id Attachment.creation Short description Date attachment was first created Definition The date that the attachment was first created. Requirements This is often tracked as an integrity issue for use of the attachment. Data type dateTime Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A (needs data type R3 proposal)