WHO Antenatal Care Guideline Implementation Guide
0.3.0 - CI Build International flag

WHO Antenatal Care Guideline Implementation Guide, published by World Health Organization (WHO). This guide is not an authorized publication; it is the continuous build for version 0.3.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/costateixeira/smart-anc/ and changes regularly. See the Directory of published versions

Resource Profile: ANC PractitionerRole

Official URL: http://fhir.org/guides/who/anc-cds/StructureDefinition/anc-practitionerrole Version: 0.3.0
Draft as of 2024-09-10 Computable Name: ANCPractitionerRole

ANC PractitionerRole

Usage:

Formal Views of Profile Content

Description of Profiles, Differentials, Snapshots and how the different presentations work.

This structure is derived from WHOPractitionerRole

NameFlagsCard.TypeDescription & Constraintsdoco
.. PractitionerRole 0..* WHOPractitionerRole Roles/organizations the practitioner is associated with
... practitioner 1..1 Reference(ANC Practitioner) Practitioner that is able to provide the defined services for the organization
... organization 1..1 Reference(ANC Organization) Organization where the roles are available
... code S 1..* CodeableConcept Roles which this practitioner may perform
Binding: ANC Persona (extensible)

doco Documentation for this format

Terminology Bindings (Differential)

PathConformanceValueSetURI
PractitionerRole.codeextensibleANCPersona (a valid code from ANC Personas)
http://fhir.org/guides/who/anc-cds/ValueSet/anc-persona
from this IG
NameFlagsCard.TypeDescription & Constraintsdoco
.. PractitionerRole 0..* WHOPractitionerRole Roles/organizations the practitioner is associated with
... 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 1..* Identifier Business Identifiers that are specific to a role/location
.... use ?!SΣ 1..1 code usual | official | temp | secondary | old (If known)
Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .

.... system SΣ 1..1 uri The namespace for the identifier value
Example General: http://www.acme.com/identifiers/patient
.... value SΣ 1..1 string The value that is unique
Example General: 123456
... period SΣ 1..1 Period The period during which the practitioner is authorized to perform in these role(s)
... practitioner SΣ 1..1 Reference(ANC Practitioner) Practitioner that is able to provide the defined services for the organization
... organization SΣ 1..1 Reference(ANC Organization) Organization where the roles are available
... code SΣ 1..* CodeableConcept Roles which this practitioner may perform
Binding: ANC Persona (extensible)
... specialty SΣ 1..* CodeableConcept Specific specialty of the practitioner
Binding: PracticeSettingCodeValueSet (preferred): Specific specialty associated with the agency.


... location SΣ 1..* Reference(ANC Location) The location(s) at which this practitioner provides care
... telecom SΣ 0..* ContactPoint Contact details that are specific to the role/location/service
.... Slices for extension Content/Rules for all slices
..... telecom-preferred S 0..1 boolean Preferred
URL: http://hl7.org/fhir/StructureDefinition/iso21090-preferred
.... system SΣC 1..1 code phone | fax | email | pager | url | sms | other
Binding: ContactPointSystem (required): Telecommunications form for contact point.

.... value SΣ 1..1 string The actual contact point details
.... use ?!SΣ 1..1 code home | work | temp | old | mobile - purpose of this contact point
Binding: ContactPointUse (required): Use of contact point.


doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
PractitionerRole.identifier.userequiredIdentifierUse
http://hl7.org/fhir/ValueSet/identifier-use|4.0.1
from the FHIR Standard
PractitionerRole.codeextensibleANCPersona (a valid code from ANC Personas)
http://fhir.org/guides/who/anc-cds/ValueSet/anc-persona
from this IG
PractitionerRole.specialtypreferredPracticeSettingCodeValueSet
http://hl7.org/fhir/ValueSet/c80-practice-codes
from the FHIR Standard
PractitionerRole.telecom.systemrequiredContactPointSystem
http://hl7.org/fhir/ValueSet/contact-point-system|4.0.1
from the FHIR Standard
PractitionerRole.telecom.userequiredContactPointUse
http://hl7.org/fhir/ValueSet/contact-point-use|4.0.1
from the FHIR Standard

Constraints

IdGradePath(s)DetailsRequirements
dom-2errorPractitionerRoleIf the resource is contained in another resource, it SHALL NOT contain nested Resources
: contained.contained.empty()
dom-3errorPractitionerRoleIf 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-4errorPractitionerRoleIf 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-5errorPractitionerRoleIf a resource is contained in another resource, it SHALL NOT have a security label
: contained.meta.security.empty()
dom-6best practicePractitionerRoleA resource should have narrative for robust management
: text.`div`.exists()
ele-1error**ALL** elementsAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1error**ALL** extensionsMust have either extensions or value[x], not both
: extension.exists() != value.exists()
NameFlagsCard.TypeDescription & Constraintsdoco
.. PractitionerRole 0..* WHOPractitionerRole Roles/organizations the practitioner is associated with
... 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
... 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 1..* Identifier Business Identifiers that are specific to a role/location
.... 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 1..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 SΣ 1..1 uri The namespace for the identifier value
Example General: http://www.acme.com/identifiers/patient
.... value SΣ 1..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 1..1 boolean Whether this practitioner role record is in active use
... period SΣ 1..1 Period The period during which the practitioner is authorized to perform in these role(s)
... practitioner SΣ 1..1 Reference(ANC Practitioner) Practitioner that is able to provide the defined services for the organization
... organization SΣ 1..1 Reference(ANC Organization) Organization where the roles are available
... code SΣ 1..* CodeableConcept Roles which this practitioner may perform
Binding: ANC Persona (extensible)
... specialty SΣ 1..* CodeableConcept Specific specialty of the practitioner
Binding: PracticeSettingCodeValueSet (preferred): Specific specialty associated with the agency.


... location SΣ 1..* Reference(ANC Location) The location(s) at which this practitioner provides care
... healthcareService 0..* Reference(HealthcareService) The list of healthcare services that this worker provides for this role's Organization/Location(s)
... telecom SΣ 0..* ContactPoint Contact details that are specific to the role/location/service
.... id 0..1 string Unique id for inter-element referencing
.... Slices for extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url
..... telecom-preferred S 0..1 boolean Preferred
URL: http://hl7.org/fhir/StructureDefinition/iso21090-preferred
.... system SΣC 1..1 code phone | fax | email | pager | url | sms | other
Binding: ContactPointSystem (required): Telecommunications form for contact point.

.... value SΣ 1..1 string The actual contact point details
.... use ?!SΣ 1..1 code home | work | temp | old | mobile - purpose of this contact point
Binding: ContactPointUse (required): Use of contact point.

.... rank Σ 0..1 positiveInt Specify preferred order of use (1 = highest)
.... period Σ 0..1 Period Time period when the contact point was/is in use
... availableTime 0..* BackboneElement Times the Service Site is available
.... 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
.... daysOfWeek 0..* code mon | tue | wed | thu | fri | sat | sun
Binding: DaysOfWeek (required): The days of the week.


.... allDay 0..1 boolean Always available? e.g. 24 hour service
.... availableStartTime 0..1 time Opening time of day (ignored if allDay = true)
.... availableEndTime 0..1 time Closing time of day (ignored if allDay = true)
... notAvailable 0..* BackboneElement Not available during this time due to provided reason
.... 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
.... description 1..1 string Reason presented to the user explaining why time not available
.... during 0..1 Period Service not available from this date
... availabilityExceptions 0..1 string Description of availability exceptions
... endpoint 0..* Reference(Endpoint) Technical endpoints providing access to services operated for the practitioner with this role

doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
PractitionerRole.languagepreferredCommonLanguages
Additional Bindings Purpose
AllLanguages Max Binding
http://hl7.org/fhir/ValueSet/languages
from the FHIR Standard
PractitionerRole.identifier.userequiredIdentifierUse
http://hl7.org/fhir/ValueSet/identifier-use|4.0.1
from the FHIR Standard
PractitionerRole.identifier.typeextensibleIdentifier Type Codes
http://hl7.org/fhir/ValueSet/identifier-type
from the FHIR Standard
PractitionerRole.codeextensibleANCPersona (a valid code from ANC Personas)
http://fhir.org/guides/who/anc-cds/ValueSet/anc-persona
from this IG
PractitionerRole.specialtypreferredPracticeSettingCodeValueSet
http://hl7.org/fhir/ValueSet/c80-practice-codes
from the FHIR Standard
PractitionerRole.telecom.systemrequiredContactPointSystem
http://hl7.org/fhir/ValueSet/contact-point-system|4.0.1
from the FHIR Standard
PractitionerRole.telecom.userequiredContactPointUse
http://hl7.org/fhir/ValueSet/contact-point-use|4.0.1
from the FHIR Standard
PractitionerRole.availableTime.daysOfWeekrequiredDaysOfWeek
http://hl7.org/fhir/ValueSet/days-of-week|4.0.1
from the FHIR Standard

Constraints

IdGradePath(s)DetailsRequirements
dom-2errorPractitionerRoleIf the resource is contained in another resource, it SHALL NOT contain nested Resources
: contained.contained.empty()
dom-3errorPractitionerRoleIf 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-4errorPractitionerRoleIf 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-5errorPractitionerRoleIf a resource is contained in another resource, it SHALL NOT have a security label
: contained.meta.security.empty()
dom-6best practicePractitionerRoleA resource should have narrative for robust management
: text.`div`.exists()
ele-1error**ALL** elementsAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1error**ALL** extensionsMust have either extensions or value[x], not both
: extension.exists() != value.exists()

Differential View

This structure is derived from WHOPractitionerRole

NameFlagsCard.TypeDescription & Constraintsdoco
.. PractitionerRole 0..* WHOPractitionerRole Roles/organizations the practitioner is associated with
... practitioner 1..1 Reference(ANC Practitioner) Practitioner that is able to provide the defined services for the organization
... organization 1..1 Reference(ANC Organization) Organization where the roles are available
... code S 1..* CodeableConcept Roles which this practitioner may perform
Binding: ANC Persona (extensible)

doco Documentation for this format

Terminology Bindings (Differential)

PathConformanceValueSetURI
PractitionerRole.codeextensibleANCPersona (a valid code from ANC Personas)
http://fhir.org/guides/who/anc-cds/ValueSet/anc-persona
from this IG

Key Elements View

NameFlagsCard.TypeDescription & Constraintsdoco
.. PractitionerRole 0..* WHOPractitionerRole Roles/organizations the practitioner is associated with
... 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 1..* Identifier Business Identifiers that are specific to a role/location
.... use ?!SΣ 1..1 code usual | official | temp | secondary | old (If known)
Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .

.... system SΣ 1..1 uri The namespace for the identifier value
Example General: http://www.acme.com/identifiers/patient
.... value SΣ 1..1 string The value that is unique
Example General: 123456
... period SΣ 1..1 Period The period during which the practitioner is authorized to perform in these role(s)
... practitioner SΣ 1..1 Reference(ANC Practitioner) Practitioner that is able to provide the defined services for the organization
... organization SΣ 1..1 Reference(ANC Organization) Organization where the roles are available
... code SΣ 1..* CodeableConcept Roles which this practitioner may perform
Binding: ANC Persona (extensible)
... specialty SΣ 1..* CodeableConcept Specific specialty of the practitioner
Binding: PracticeSettingCodeValueSet (preferred): Specific specialty associated with the agency.


... location SΣ 1..* Reference(ANC Location) The location(s) at which this practitioner provides care
... telecom SΣ 0..* ContactPoint Contact details that are specific to the role/location/service
.... Slices for extension Content/Rules for all slices
..... telecom-preferred S 0..1 boolean Preferred
URL: http://hl7.org/fhir/StructureDefinition/iso21090-preferred
.... system SΣC 1..1 code phone | fax | email | pager | url | sms | other
Binding: ContactPointSystem (required): Telecommunications form for contact point.

.... value SΣ 1..1 string The actual contact point details
.... use ?!SΣ 1..1 code home | work | temp | old | mobile - purpose of this contact point
Binding: ContactPointUse (required): Use of contact point.


doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
PractitionerRole.identifier.userequiredIdentifierUse
http://hl7.org/fhir/ValueSet/identifier-use|4.0.1
from the FHIR Standard
PractitionerRole.codeextensibleANCPersona (a valid code from ANC Personas)
http://fhir.org/guides/who/anc-cds/ValueSet/anc-persona
from this IG
PractitionerRole.specialtypreferredPracticeSettingCodeValueSet
http://hl7.org/fhir/ValueSet/c80-practice-codes
from the FHIR Standard
PractitionerRole.telecom.systemrequiredContactPointSystem
http://hl7.org/fhir/ValueSet/contact-point-system|4.0.1
from the FHIR Standard
PractitionerRole.telecom.userequiredContactPointUse
http://hl7.org/fhir/ValueSet/contact-point-use|4.0.1
from the FHIR Standard

Constraints

IdGradePath(s)DetailsRequirements
dom-2errorPractitionerRoleIf the resource is contained in another resource, it SHALL NOT contain nested Resources
: contained.contained.empty()
dom-3errorPractitionerRoleIf 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-4errorPractitionerRoleIf 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-5errorPractitionerRoleIf a resource is contained in another resource, it SHALL NOT have a security label
: contained.meta.security.empty()
dom-6best practicePractitionerRoleA resource should have narrative for robust management
: text.`div`.exists()
ele-1error**ALL** elementsAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1error**ALL** extensionsMust have either extensions or value[x], not both
: extension.exists() != value.exists()

Snapshot View

NameFlagsCard.TypeDescription & Constraintsdoco
.. PractitionerRole 0..* WHOPractitionerRole Roles/organizations the practitioner is associated with
... 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
... 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 1..* Identifier Business Identifiers that are specific to a role/location
.... 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 1..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 SΣ 1..1 uri The namespace for the identifier value
Example General: http://www.acme.com/identifiers/patient
.... value SΣ 1..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 1..1 boolean Whether this practitioner role record is in active use
... period SΣ 1..1 Period The period during which the practitioner is authorized to perform in these role(s)
... practitioner SΣ 1..1 Reference(ANC Practitioner) Practitioner that is able to provide the defined services for the organization
... organization SΣ 1..1 Reference(ANC Organization) Organization where the roles are available
... code SΣ 1..* CodeableConcept Roles which this practitioner may perform
Binding: ANC Persona (extensible)
... specialty SΣ 1..* CodeableConcept Specific specialty of the practitioner
Binding: PracticeSettingCodeValueSet (preferred): Specific specialty associated with the agency.


... location SΣ 1..* Reference(ANC Location) The location(s) at which this practitioner provides care
... healthcareService 0..* Reference(HealthcareService) The list of healthcare services that this worker provides for this role's Organization/Location(s)
... telecom SΣ 0..* ContactPoint Contact details that are specific to the role/location/service
.... id 0..1 string Unique id for inter-element referencing
.... Slices for extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url
..... telecom-preferred S 0..1 boolean Preferred
URL: http://hl7.org/fhir/StructureDefinition/iso21090-preferred
.... system SΣC 1..1 code phone | fax | email | pager | url | sms | other
Binding: ContactPointSystem (required): Telecommunications form for contact point.

.... value SΣ 1..1 string The actual contact point details
.... use ?!SΣ 1..1 code home | work | temp | old | mobile - purpose of this contact point
Binding: ContactPointUse (required): Use of contact point.

.... rank Σ 0..1 positiveInt Specify preferred order of use (1 = highest)
.... period Σ 0..1 Period Time period when the contact point was/is in use
... availableTime 0..* BackboneElement Times the Service Site is available
.... 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
.... daysOfWeek 0..* code mon | tue | wed | thu | fri | sat | sun
Binding: DaysOfWeek (required): The days of the week.


.... allDay 0..1 boolean Always available? e.g. 24 hour service
.... availableStartTime 0..1 time Opening time of day (ignored if allDay = true)
.... availableEndTime 0..1 time Closing time of day (ignored if allDay = true)
... notAvailable 0..* BackboneElement Not available during this time due to provided reason
.... 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
.... description 1..1 string Reason presented to the user explaining why time not available
.... during 0..1 Period Service not available from this date
... availabilityExceptions 0..1 string Description of availability exceptions
... endpoint 0..* Reference(Endpoint) Technical endpoints providing access to services operated for the practitioner with this role

doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
PractitionerRole.languagepreferredCommonLanguages
Additional Bindings Purpose
AllLanguages Max Binding
http://hl7.org/fhir/ValueSet/languages
from the FHIR Standard
PractitionerRole.identifier.userequiredIdentifierUse
http://hl7.org/fhir/ValueSet/identifier-use|4.0.1
from the FHIR Standard
PractitionerRole.identifier.typeextensibleIdentifier Type Codes
http://hl7.org/fhir/ValueSet/identifier-type
from the FHIR Standard
PractitionerRole.codeextensibleANCPersona (a valid code from ANC Personas)
http://fhir.org/guides/who/anc-cds/ValueSet/anc-persona
from this IG
PractitionerRole.specialtypreferredPracticeSettingCodeValueSet
http://hl7.org/fhir/ValueSet/c80-practice-codes
from the FHIR Standard
PractitionerRole.telecom.systemrequiredContactPointSystem
http://hl7.org/fhir/ValueSet/contact-point-system|4.0.1
from the FHIR Standard
PractitionerRole.telecom.userequiredContactPointUse
http://hl7.org/fhir/ValueSet/contact-point-use|4.0.1
from the FHIR Standard
PractitionerRole.availableTime.daysOfWeekrequiredDaysOfWeek
http://hl7.org/fhir/ValueSet/days-of-week|4.0.1
from the FHIR Standard

Constraints

IdGradePath(s)DetailsRequirements
dom-2errorPractitionerRoleIf the resource is contained in another resource, it SHALL NOT contain nested Resources
: contained.contained.empty()
dom-3errorPractitionerRoleIf 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-4errorPractitionerRoleIf 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-5errorPractitionerRoleIf a resource is contained in another resource, it SHALL NOT have a security label
: contained.meta.security.empty()
dom-6best practicePractitionerRoleA resource should have narrative for robust management
: text.`div`.exists()
ele-1error**ALL** elementsAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1error**ALL** extensionsMust have either extensions or value[x], not both
: extension.exists() != value.exists()

 

Other representations of profile: CSV, Excel, Schematron