This page is part of the Clinical Guidelines (v2.0.0-ballot: STU2 Ballot 1) based on FHIR (HL7® FHIR® Standard) R4. The current version which supersedes this version is 1.0.0. For a full list of available versions, see the Directory of published versions
Official URL: http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-patient | Version: 2.0.0-ballot | |||
Active as of 2023-12-19 | Computable Name: CPGPatient |
Profile of Patient for use with CPG Implementation Guide
This is a domain case/instance profile
Usage:
Description of Profiles, Differentials, Snapshots and how the different presentations work.
This structure is derived from Patient
Name | Flags | Card. | Type | Description & Constraints |
---|---|---|---|---|
Patient | Patient | |||
identifier | S | 0..* | Identifier | An identifier for this patient |
use | S | 0..1 | code | usual | official | temp | secondary | old (If known) |
value | S | 0..1 | string | The value that is unique |
active | S | 0..1 | boolean | Whether this patient's record is in active use |
name | S | 1..* | HumanName | A name associated with the patient |
use | S | 0..1 | code | usual | official | temp | nickname | anonymous | old | maiden |
Documentation for this format |
Name | Flags | Card. | Type | Description & Constraints |
---|---|---|---|---|
Patient | 0..* | Patient | Information about an individual or animal receiving health care services | |
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created |
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored |
identifier | SΣ | 0..* | Identifier | An identifier for this patient |
use | ?!SΣ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . |
value | SΣ | 0..1 | string | The value that is unique Example General: 123456 |
active | ?!SΣ | 0..1 | boolean | Whether this patient's record is in active use |
name | SΣ | 1..* | HumanName | A name associated with the patient |
use | ?!SΣ | 0..1 | code | usual | official | temp | nickname | anonymous | old | maiden Binding: NameUse (required): The use of a human name. |
deceased[x] | ?!Σ | 0..1 | Indicates if the individual is deceased or not | |
deceasedBoolean | boolean | |||
deceasedDateTime | dateTime | |||
link | ?!Σ | 0..* | BackboneElement | Link to another patient resource that concerns the same actual person |
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
other | Σ | 1..1 | Reference(Patient | RelatedPerson) | The other patient or related person resource that the link refers to |
type | Σ | 1..1 | code | replaced-by | replaces | refer | seealso Binding: LinkType (required): The type of link between this patient resource and another patient resource. |
Documentation for this format |
Path | Conformance | ValueSet |
Patient.identifier.use | required | IdentifierUse |
Patient.name.use | required | NameUse |
Patient.link.type | required | LinkType |
Id | Grade | Path(s) | Details | Requirements |
dom-2 | error | Patient | If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty() | |
dom-3 | error | Patient | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty() | |
dom-4 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty() | |
dom-5 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty() | |
dom-6 | best practice | Patient | A resource should have narrative for robust management : text.`div`.exists() | |
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count()) | |
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both : extension.exists() != value.exists() |
Name | Flags | Card. | Type | Description & Constraints | ||||
---|---|---|---|---|---|---|---|---|
Patient | 0..* | Patient | Information about an individual or animal receiving health care services | |||||
id | Σ | 0..1 | id | Logical id of this artifact | ||||
meta | Σ | 0..1 | Meta | Metadata about the resource | ||||
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created | ||||
language | 0..1 | code | Language of the resource content Binding: CommonLanguages (preferred): A human language.
| |||||
text | 0..1 | Narrative | Text summary of the resource, for human interpretation | |||||
contained | 0..* | Resource | Contained, inline Resources | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored | ||||
identifier | SΣ | 0..* | Identifier | An identifier for this patient | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |||||
use | ?!SΣ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . | ||||
type | Σ | 0..1 | CodeableConcept | Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose. | ||||
system | Σ | 0..1 | uri | The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient | ||||
value | SΣ | 0..1 | string | The value that is unique Example General: 123456 | ||||
period | Σ | 0..1 | Period | Time period when id is/was valid for use | ||||
assigner | Σ | 0..1 | Reference(Organization) | Organization that issued id (may be just text) | ||||
active | ?!SΣ | 0..1 | boolean | Whether this patient's record is in active use | ||||
name | SΣ | 1..* | HumanName | A name associated with the patient | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |||||
use | ?!SΣ | 0..1 | code | usual | official | temp | nickname | anonymous | old | maiden Binding: NameUse (required): The use of a human name. | ||||
text | Σ | 0..1 | string | Text representation of the full name | ||||
family | Σ | 0..1 | string | Family name (often called 'Surname') | ||||
given | Σ | 0..* | string | Given names (not always 'first'). Includes middle names This repeating element order: Given Names appear in the correct order for presenting the name | ||||
prefix | Σ | 0..* | string | Parts that come before the name This repeating element order: Prefixes appear in the correct order for presenting the name | ||||
suffix | Σ | 0..* | string | Parts that come after the name This repeating element order: Suffixes appear in the correct order for presenting the name | ||||
period | Σ | 0..1 | Period | Time period when name was/is in use | ||||
telecom | Σ | 0..* | ContactPoint | A contact detail for the individual | ||||
gender | Σ | 0..1 | code | male | female | other | unknown Binding: AdministrativeGender (required): The gender of a person used for administrative purposes. | ||||
birthDate | Σ | 0..1 | date | The date of birth for the individual | ||||
deceased[x] | ?!Σ | 0..1 | Indicates if the individual is deceased or not | |||||
deceasedBoolean | boolean | |||||||
deceasedDateTime | dateTime | |||||||
address | Σ | 0..* | Address | An address for the individual | ||||
maritalStatus | 0..1 | CodeableConcept | Marital (civil) status of a patient Binding: Marital Status Codes (extensible): The domestic partnership status of a person. | |||||
multipleBirth[x] | 0..1 | Whether patient is part of a multiple birth | ||||||
multipleBirthBoolean | boolean | |||||||
multipleBirthInteger | integer | |||||||
photo | 0..* | Attachment | Image of the patient | |||||
contact | C | 0..* | BackboneElement | A contact party (e.g. guardian, partner, friend) for the patient | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized | ||||
relationship | 0..* | CodeableConcept | The kind of relationship Binding: PatientContactRelationship (extensible): The nature of the relationship between a patient and a contact person for that patient. | |||||
name | 0..1 | HumanName | A name associated with the contact person | |||||
telecom | 0..* | ContactPoint | A contact detail for the person | |||||
address | 0..1 | Address | Address for the contact person | |||||
gender | 0..1 | code | male | female | other | unknown Binding: AdministrativeGender (required): The gender of a person used for administrative purposes. | |||||
organization | C | 0..1 | Reference(Organization) | Organization that is associated with the contact | ||||
period | 0..1 | Period | The period during which this contact person or organization is valid to be contacted relating to this patient | |||||
communication | 0..* | BackboneElement | A language which may be used to communicate with the patient about his or her health | |||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized | ||||
language | 1..1 | CodeableConcept | The language which can be used to communicate with the patient about his or her health Binding: CommonLanguages (preferred): A human language.
| |||||
preferred | 0..1 | boolean | Language preference indicator | |||||
generalPractitioner | 0..* | Reference(Organization | Practitioner | PractitionerRole) | Patient's nominated primary care provider | |||||
managingOrganization | Σ | 0..1 | Reference(Organization) | Organization that is the custodian of the patient record | ||||
link | ?!Σ | 0..* | BackboneElement | Link to another patient resource that concerns the same actual person | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized | ||||
other | Σ | 1..1 | Reference(Patient | RelatedPerson) | The other patient or related person resource that the link refers to | ||||
type | Σ | 1..1 | code | replaced-by | replaces | refer | seealso Binding: LinkType (required): The type of link between this patient resource and another patient resource. | ||||
Documentation for this format |
Path | Conformance | ValueSet | ||||
Patient.language | preferred | CommonLanguages
| ||||
Patient.identifier.use | required | IdentifierUse | ||||
Patient.identifier.type | extensible | Identifier Type Codes | ||||
Patient.name.use | required | NameUse | ||||
Patient.gender | required | AdministrativeGender | ||||
Patient.maritalStatus | extensible | Marital Status Codes | ||||
Patient.contact.relationship | extensible | PatientContactRelationship | ||||
Patient.contact.gender | required | AdministrativeGender | ||||
Patient.communication.language | preferred | CommonLanguages
| ||||
Patient.link.type | required | LinkType |
Id | Grade | Path(s) | Details | Requirements |
dom-2 | error | Patient | If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty() | |
dom-3 | error | Patient | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty() | |
dom-4 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty() | |
dom-5 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty() | |
dom-6 | best practice | Patient | A resource should have narrative for robust management : text.`div`.exists() | |
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count()) | |
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both : extension.exists() != value.exists() | |
pat-1 | error | Patient.contact | SHALL at least contain a contact's details or a reference to an organization : name.exists() or telecom.exists() or address.exists() or organization.exists() |
This structure is derived from Patient
Differential View
This structure is derived from Patient
Name | Flags | Card. | Type | Description & Constraints |
---|---|---|---|---|
Patient | Patient | |||
identifier | S | 0..* | Identifier | An identifier for this patient |
use | S | 0..1 | code | usual | official | temp | secondary | old (If known) |
value | S | 0..1 | string | The value that is unique |
active | S | 0..1 | boolean | Whether this patient's record is in active use |
name | S | 1..* | HumanName | A name associated with the patient |
use | S | 0..1 | code | usual | official | temp | nickname | anonymous | old | maiden |
Documentation for this format |
Key Elements View
Name | Flags | Card. | Type | Description & Constraints |
---|---|---|---|---|
Patient | 0..* | Patient | Information about an individual or animal receiving health care services | |
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created |
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored |
identifier | SΣ | 0..* | Identifier | An identifier for this patient |
use | ?!SΣ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . |
value | SΣ | 0..1 | string | The value that is unique Example General: 123456 |
active | ?!SΣ | 0..1 | boolean | Whether this patient's record is in active use |
name | SΣ | 1..* | HumanName | A name associated with the patient |
use | ?!SΣ | 0..1 | code | usual | official | temp | nickname | anonymous | old | maiden Binding: NameUse (required): The use of a human name. |
deceased[x] | ?!Σ | 0..1 | Indicates if the individual is deceased or not | |
deceasedBoolean | boolean | |||
deceasedDateTime | dateTime | |||
link | ?!Σ | 0..* | BackboneElement | Link to another patient resource that concerns the same actual person |
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
other | Σ | 1..1 | Reference(Patient | RelatedPerson) | The other patient or related person resource that the link refers to |
type | Σ | 1..1 | code | replaced-by | replaces | refer | seealso Binding: LinkType (required): The type of link between this patient resource and another patient resource. |
Documentation for this format |
Path | Conformance | ValueSet |
Patient.identifier.use | required | IdentifierUse |
Patient.name.use | required | NameUse |
Patient.link.type | required | LinkType |
Id | Grade | Path(s) | Details | Requirements |
dom-2 | error | Patient | If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty() | |
dom-3 | error | Patient | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty() | |
dom-4 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty() | |
dom-5 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty() | |
dom-6 | best practice | Patient | A resource should have narrative for robust management : text.`div`.exists() | |
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count()) | |
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both : extension.exists() != value.exists() |
Snapshot View
Name | Flags | Card. | Type | Description & Constraints | ||||
---|---|---|---|---|---|---|---|---|
Patient | 0..* | Patient | Information about an individual or animal receiving health care services | |||||
id | Σ | 0..1 | id | Logical id of this artifact | ||||
meta | Σ | 0..1 | Meta | Metadata about the resource | ||||
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created | ||||
language | 0..1 | code | Language of the resource content Binding: CommonLanguages (preferred): A human language.
| |||||
text | 0..1 | Narrative | Text summary of the resource, for human interpretation | |||||
contained | 0..* | Resource | Contained, inline Resources | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored | ||||
identifier | SΣ | 0..* | Identifier | An identifier for this patient | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |||||
use | ?!SΣ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . | ||||
type | Σ | 0..1 | CodeableConcept | Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose. | ||||
system | Σ | 0..1 | uri | The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient | ||||
value | SΣ | 0..1 | string | The value that is unique Example General: 123456 | ||||
period | Σ | 0..1 | Period | Time period when id is/was valid for use | ||||
assigner | Σ | 0..1 | Reference(Organization) | Organization that issued id (may be just text) | ||||
active | ?!SΣ | 0..1 | boolean | Whether this patient's record is in active use | ||||
name | SΣ | 1..* | HumanName | A name associated with the patient | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |||||
use | ?!SΣ | 0..1 | code | usual | official | temp | nickname | anonymous | old | maiden Binding: NameUse (required): The use of a human name. | ||||
text | Σ | 0..1 | string | Text representation of the full name | ||||
family | Σ | 0..1 | string | Family name (often called 'Surname') | ||||
given | Σ | 0..* | string | Given names (not always 'first'). Includes middle names This repeating element order: Given Names appear in the correct order for presenting the name | ||||
prefix | Σ | 0..* | string | Parts that come before the name This repeating element order: Prefixes appear in the correct order for presenting the name | ||||
suffix | Σ | 0..* | string | Parts that come after the name This repeating element order: Suffixes appear in the correct order for presenting the name | ||||
period | Σ | 0..1 | Period | Time period when name was/is in use | ||||
telecom | Σ | 0..* | ContactPoint | A contact detail for the individual | ||||
gender | Σ | 0..1 | code | male | female | other | unknown Binding: AdministrativeGender (required): The gender of a person used for administrative purposes. | ||||
birthDate | Σ | 0..1 | date | The date of birth for the individual | ||||
deceased[x] | ?!Σ | 0..1 | Indicates if the individual is deceased or not | |||||
deceasedBoolean | boolean | |||||||
deceasedDateTime | dateTime | |||||||
address | Σ | 0..* | Address | An address for the individual | ||||
maritalStatus | 0..1 | CodeableConcept | Marital (civil) status of a patient Binding: Marital Status Codes (extensible): The domestic partnership status of a person. | |||||
multipleBirth[x] | 0..1 | Whether patient is part of a multiple birth | ||||||
multipleBirthBoolean | boolean | |||||||
multipleBirthInteger | integer | |||||||
photo | 0..* | Attachment | Image of the patient | |||||
contact | C | 0..* | BackboneElement | A contact party (e.g. guardian, partner, friend) for the patient | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized | ||||
relationship | 0..* | CodeableConcept | The kind of relationship Binding: PatientContactRelationship (extensible): The nature of the relationship between a patient and a contact person for that patient. | |||||
name | 0..1 | HumanName | A name associated with the contact person | |||||
telecom | 0..* | ContactPoint | A contact detail for the person | |||||
address | 0..1 | Address | Address for the contact person | |||||
gender | 0..1 | code | male | female | other | unknown Binding: AdministrativeGender (required): The gender of a person used for administrative purposes. | |||||
organization | C | 0..1 | Reference(Organization) | Organization that is associated with the contact | ||||
period | 0..1 | Period | The period during which this contact person or organization is valid to be contacted relating to this patient | |||||
communication | 0..* | BackboneElement | A language which may be used to communicate with the patient about his or her health | |||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized | ||||
language | 1..1 | CodeableConcept | The language which can be used to communicate with the patient about his or her health Binding: CommonLanguages (preferred): A human language.
| |||||
preferred | 0..1 | boolean | Language preference indicator | |||||
generalPractitioner | 0..* | Reference(Organization | Practitioner | PractitionerRole) | Patient's nominated primary care provider | |||||
managingOrganization | Σ | 0..1 | Reference(Organization) | Organization that is the custodian of the patient record | ||||
link | ?!Σ | 0..* | BackboneElement | Link to another patient resource that concerns the same actual person | ||||
id | 0..1 | string | Unique id for inter-element referencing | |||||
extension | 0..* | Extension | Additional content defined by implementations | |||||
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized | ||||
other | Σ | 1..1 | Reference(Patient | RelatedPerson) | The other patient or related person resource that the link refers to | ||||
type | Σ | 1..1 | code | replaced-by | replaces | refer | seealso Binding: LinkType (required): The type of link between this patient resource and another patient resource. | ||||
Documentation for this format |
Path | Conformance | ValueSet | ||||
Patient.language | preferred | CommonLanguages
| ||||
Patient.identifier.use | required | IdentifierUse | ||||
Patient.identifier.type | extensible | Identifier Type Codes | ||||
Patient.name.use | required | NameUse | ||||
Patient.gender | required | AdministrativeGender | ||||
Patient.maritalStatus | extensible | Marital Status Codes | ||||
Patient.contact.relationship | extensible | PatientContactRelationship | ||||
Patient.contact.gender | required | AdministrativeGender | ||||
Patient.communication.language | preferred | CommonLanguages
| ||||
Patient.link.type | required | LinkType |
Id | Grade | Path(s) | Details | Requirements |
dom-2 | error | Patient | If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty() | |
dom-3 | error | Patient | If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty() | |
dom-4 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty() | |
dom-5 | error | Patient | If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty() | |
dom-6 | best practice | Patient | A resource should have narrative for robust management : text.`div`.exists() | |
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count()) | |
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both : extension.exists() != value.exists() | |
pat-1 | error | Patient.contact | SHALL at least contain a contact's details or a reference to an organization : name.exists() or telecom.exists() or address.exists() or organization.exists() |
This structure is derived from Patient
Other representations of profile: CSV, Excel, Schematron