This page is part of the FHIR Specification (v1.2.0: STU 3 Draft). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions
StructureDefinition for decisionsupportrule
{ "resourceType": "StructureDefinition", "id": "DecisionSupportRule", "meta": { "lastUpdated": "2015-12-11T17:38:40.294+11:00" }, "text": { "status": "generated", "div": "<div>!-- Snipped for Brevity --></div>" }, "extension": [ { "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm", "valueInteger": 0 } ], "url": "http://hl7.org/fhir/StructureDefinition/DecisionSupportRule", "name": "DecisionSupportRule", "status": "draft", "publisher": "Health Level Seven International (Clinical Decision Support)", "contact": [ { "telecom": [ { "system": "other", "value": "http://hl7.org/fhir" } ] }, { "telecom": [ { "system": "other", "value": "http://www.hl7.org/Special/committees/dss/index.cfm" } ] } ], "date": "2015-12-11T17:38:40+11:00", "description": "Base StructureDefinition for DecisionSupportRule Resource", "fhirVersion": "1.2.0", "mapping": [ { "identity": "w5", "uri": "http://hl7.org/fhir/w5", "name": "W5 Mapping" }, { "identity": "rim", "uri": "http://hl7.org/v3", "name": "RIM" } ], "kind": "resource", "abstract": false, "base": "http://hl7.org/fhir/StructureDefinition/DomainResource", "snapshot": { "element": [ { "path": "DecisionSupportRule", "short": "A decision support rule", "definition": "This resource defines a decision support rule of the form [on Event] if Condition then Action.", "min": 0, "max": "*", "type": [ { "code": "DomainResource" } ], "mapping": [ { "identity": "w5", "map": "clinical.general" } ] }, { "path": "DecisionSupportRule.id", "short": "Logical id of this artifact", "definition": "The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.", "comments": "The only time that a resource does not have an id is when it is being submitted to the server using a create operation. Bundles always have an id, though it is usually a generated UUID.", "min": 0, "max": "1", "type": [ { "code": "id" } ], "isSummary": true }, { "path": "DecisionSupportRule.meta", "short": "Metadata about the resource", "definition": "The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content may not always be associated with version changes to the resource.", "min": 0, "max": "1", "type": [ { "code": "Meta" } ], "isSummary": true }, { "path": "DecisionSupportRule.implicitRules", "short": "A set of rules under which this content was created", "definition": "A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content.", "comments": "Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element as much as possible.", "min": 0, "max": "1", "type": [ { "code": "uri" } ], "isModifier": true, "isSummary": true }, { "path": "DecisionSupportRule.language", "short": "Language of the resource content", "definition": "The base language in which the resource is written.", "comments": "Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).", "min": 0, "max": "1", "type": [ { "code": "code" } ], "binding": { "strength": "required", "description": "A human language.", "valueSetUri": "http://tools.ietf.org/html/bcp47" } }, { "path": "DecisionSupportRule.text", "short": "Text summary of the resource, for human interpretation", "definition": "A human-readable narrative that contains a summary of the resource, and may be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it \"clinically safe\" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.", "comments": "Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative.", "alias": [ "narrative", "html", "xhtml", "display" ], "min": 0, "max": "1", "type": [ { "code": "Narrative" } ], "condition": [ "dom-1" ], "mapping": [ { "identity": "rim", "map": "Act.text?" } ] }, { "path": "DecisionSupportRule.contained", "short": "Contained, inline Resources", "definition": "These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.", "comments": "This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again.", "alias": [ "inline resources", "anonymous resources", "contained resources" ], "min": 0, "max": "*", "type": [ { "code": "Resource" } ], "mapping": [ { "identity": "rim", "map": "N/A" } ] }, { "path": "DecisionSupportRule.extension", "short": "Additional Content defined by implementations", "definition": "May be used to represent additional information that is not part of the basic definition of the resource. In order 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 is allowed to 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.", "alias": [ "extensions", "user content" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "mapping": [ { "identity": "rim", "map": "N/A" } ] }, { "path": "DecisionSupportRule.modifierExtension", "short": "Extensions that cannot be ignored", "definition": "May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order 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 is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.", "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.", "alias": [ "extensions", "user content" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "isModifier": true, "mapping": [ { "identity": "rim", "map": "N/A" } ] }, { "path": "DecisionSupportRule.identifier", "short": "Logical identifier", "definition": "A logical identifier for the module such as the CMS or NQF identifiers for a measure artifact.", "min": 0, "max": "*", "type": [ { "code": "Identifier" } ], "isSummary": true, "mapping": [ { "identity": "w5", "map": "id" } ] }, { "path": "DecisionSupportRule.version", "short": "The version of the module, if any", "definition": "The version of the module, if any. To provide a version consistent with the Decision Support Service specification, use the format Major.Minor.Revision (e.g. 1.0.0). For more information on versioning knowledge modules, refer to the Decision Support Service specification.", "min": 0, "max": "1", "type": [ { "code": "string" } ], "isSummary": true }, { "path": "DecisionSupportRule.moduleMetadata", "short": "Module information for the rule", "definition": "A reference to a ModuleMetadata resource that provides metadata for the rule.", "min": 0, "max": "1", "type": [ { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/ModuleMetadata" ] } ] }, { "path": "DecisionSupportRule.library", "short": "A library containing logic used by the rule", "definition": "A reference to a Library containing the formal logic used by the rule.", "min": 0, "max": "*", "type": [ { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/Library" ] } ] }, { "path": "DecisionSupportRule.trigger", "definition": "A description of a triggering event.", "min": 0, "max": "*", "type": [ { "code": "BackboneElement" } ] }, { "path": "DecisionSupportRule.trigger.id", "representation": [ "xmlAttr" ], "short": "xml:id (or equivalent in JSON)", "definition": "unique id for the element within a resource (for internal references).", "min": 0, "max": "1", "type": [ { "code": "id" } ], "mapping": [ { "identity": "rim", "map": "n/a" } ] }, { "path": "DecisionSupportRule.trigger.extension", "short": "Additional Content defined by implementations", "definition": "May be used to represent additional information that is not part of the basic definition of the element. In order 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 is allowed to 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.", "alias": [ "extensions", "user content" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "mapping": [ { "identity": "rim", "map": "n/a" } ] }, { "path": "DecisionSupportRule.trigger.modifierExtension", "short": "Extensions that cannot be ignored", "definition": "May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order 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 is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.", "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.", "alias": [ "extensions", "user content", "modifiers" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "isModifier": true, "mapping": [ { "identity": "rim", "map": "N/A" } ] }, { "path": "DecisionSupportRule.trigger.type", "short": "named-event | periodic | data-added | data-modified | data-removed | data-accessed | data-access-ended", "definition": "The type of triggering event.", "min": 1, "max": "1", "type": [ { "code": "code" } ], "binding": { "strength": "required", "description": "The type of trigger", "valueSetReference": { "reference": "http://hl7.org/fhir/ValueSet/cds-rule-trigger-type" } } }, { "path": "DecisionSupportRule.trigger.eventName", "definition": "The name of the event (if this is a named-event trigger).", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.trigger.eventTiming[x]", "definition": "The timing of the event (if this is a period trigger).", "min": 0, "max": "1", "type": [ { "code": "Timing" }, { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/Schedule" ] }, { "code": "date" }, { "code": "dateTime" } ] }, { "path": "DecisionSupportRule.condition", "definition": "The condition for the artifact.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action", "name": "action", "definition": "The definition of the actions that should be returned by evaluation of the artifact.", "min": 0, "max": "*", "type": [ { "code": "BackboneElement" } ] }, { "path": "DecisionSupportRule.action.id", "representation": [ "xmlAttr" ], "short": "xml:id (or equivalent in JSON)", "definition": "unique id for the element within a resource (for internal references).", "min": 0, "max": "1", "type": [ { "code": "id" } ], "mapping": [ { "identity": "rim", "map": "n/a" } ] }, { "path": "DecisionSupportRule.action.extension", "short": "Additional Content defined by implementations", "definition": "May be used to represent additional information that is not part of the basic definition of the element. In order 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 is allowed to 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.", "alias": [ "extensions", "user content" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "mapping": [ { "identity": "rim", "map": "n/a" } ] }, { "path": "DecisionSupportRule.action.modifierExtension", "short": "Extensions that cannot be ignored", "definition": "May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order 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 is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.", "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.", "alias": [ "extensions", "user content", "modifiers" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "isModifier": true, "mapping": [ { "identity": "rim", "map": "N/A" } ] }, { "path": "DecisionSupportRule.action.actionIdentifier", "definition": "A unique identifier for the action.", "min": 0, "max": "1", "type": [ { "code": "Identifier" } ] }, { "path": "DecisionSupportRule.action.number", "definition": "A user-visible number for the action.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.supportingEvidence", "definition": "Supporting evidence for the action.", "min": 0, "max": "*", "type": [ { "code": "Attachment" } ] }, { "path": "DecisionSupportRule.action.documentation", "definition": "Supporting documentation for the action.", "min": 0, "max": "*", "type": [ { "code": "Attachment" } ] }, { "path": "DecisionSupportRule.action.participantType", "short": "patient | person | practitioner | related-person", "definition": "The type of participant in the action.", "min": 0, "max": "*", "type": [ { "code": "code" } ], "binding": { "strength": "required", "description": "The type of participant for an action in the module", "valueSetReference": { "reference": "http://hl7.org/fhir/ValueSet/cds-rule-participant" } } }, { "path": "DecisionSupportRule.action.title", "definition": "The title of the action.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.description", "definition": "A short description of the action.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.textEquivalent", "definition": "A text equivalent of the action to be performed.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.concept", "definition": "Concepts associated with the action.", "min": 0, "max": "*", "type": [ { "code": "CodeableConcept" } ] }, { "path": "DecisionSupportRule.action.type", "short": "create | update | remove | fire-event", "definition": "The type of action to perform (create, update, remove).", "min": 0, "max": "1", "type": [ { "code": "code" } ], "binding": { "strength": "extensible", "description": "The type of action to be performed", "valueSetReference": { "reference": "http://hl7.org/fhir/ValueSet/cds-rule-action-type" } } }, { "path": "DecisionSupportRule.action.resource", "definition": "The resource that is the target of the action (e.g. CommunicationRequest).", "min": 0, "max": "1", "type": [ { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/Resource" ] } ] }, { "path": "DecisionSupportRule.action.customization", "definition": "Customizations that should be applied to the statically defined resource.", "min": 0, "max": "*", "type": [ { "code": "BackboneElement" } ] }, { "path": "DecisionSupportRule.action.customization.id", "representation": [ "xmlAttr" ], "short": "xml:id (or equivalent in JSON)", "definition": "unique id for the element within a resource (for internal references).", "min": 0, "max": "1", "type": [ { "code": "id" } ], "mapping": [ { "identity": "rim", "map": "n/a" } ] }, { "path": "DecisionSupportRule.action.customization.extension", "short": "Additional Content defined by implementations", "definition": "May be used to represent additional information that is not part of the basic definition of the element. In order 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 is allowed to 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.", "alias": [ "extensions", "user content" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "mapping": [ { "identity": "rim", "map": "n/a" } ] }, { "path": "DecisionSupportRule.action.customization.modifierExtension", "short": "Extensions that cannot be ignored", "definition": "May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order 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 is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.", "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.", "alias": [ "extensions", "user content", "modifiers" ], "min": 0, "max": "*", "type": [ { "code": "Extension" } ], "isModifier": true, "mapping": [ { "identity": "rim", "map": "N/A" } ] }, { "path": "DecisionSupportRule.action.customization.path", "definition": "The path to the element to be customized.", "min": 1, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.customization.expression", "definition": "An expression specifying the value of the customized element.", "min": 1, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.actions", "definition": "Sub actions.", "min": 0, "max": "*", "nameReference": "action" } ] }, "differential": { "element": [ { "path": "DecisionSupportRule", "short": "A decision support rule", "definition": "This resource defines a decision support rule of the form [on Event] if Condition then Action.", "min": 0, "max": "*", "type": [ { "code": "DomainResource" } ], "mapping": [ { "identity": "w5", "map": "clinical.general" } ] }, { "path": "DecisionSupportRule.identifier", "short": "Logical identifier", "definition": "A logical identifier for the module such as the CMS or NQF identifiers for a measure artifact.", "min": 0, "max": "*", "type": [ { "code": "Identifier" } ], "isSummary": true, "mapping": [ { "identity": "w5", "map": "id" } ] }, { "path": "DecisionSupportRule.version", "short": "The version of the module, if any", "definition": "The version of the module, if any. To provide a version consistent with the Decision Support Service specification, use the format Major.Minor.Revision (e.g. 1.0.0). For more information on versioning knowledge modules, refer to the Decision Support Service specification.", "min": 0, "max": "1", "type": [ { "code": "string" } ], "isSummary": true }, { "path": "DecisionSupportRule.moduleMetadata", "short": "Module information for the rule", "definition": "A reference to a ModuleMetadata resource that provides metadata for the rule.", "min": 0, "max": "1", "type": [ { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/ModuleMetadata" ] } ] }, { "path": "DecisionSupportRule.library", "short": "A library containing logic used by the rule", "definition": "A reference to a Library containing the formal logic used by the rule.", "min": 0, "max": "*", "type": [ { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/Library" ] } ] }, { "path": "DecisionSupportRule.trigger", "definition": "A description of a triggering event.", "min": 0, "max": "*", "type": [ { "code": "BackboneElement" } ] }, { "path": "DecisionSupportRule.trigger.type", "short": "named-event | periodic | data-added | data-modified | data-removed | data-accessed | data-access-ended", "definition": "The type of triggering event.", "min": 1, "max": "1", "type": [ { "code": "code" } ], "binding": { "strength": "required", "description": "The type of trigger", "valueSetReference": { "reference": "http://hl7.org/fhir/ValueSet/cds-rule-trigger-type" } } }, { "path": "DecisionSupportRule.trigger.eventName", "definition": "The name of the event (if this is a named-event trigger).", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.trigger.eventTiming[x]", "definition": "The timing of the event (if this is a period trigger).", "min": 0, "max": "1", "type": [ { "code": "Timing" }, { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/Schedule" ] }, { "code": "date" }, { "code": "dateTime" } ] }, { "path": "DecisionSupportRule.condition", "definition": "The condition for the artifact.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action", "name": "action", "definition": "The definition of the actions that should be returned by evaluation of the artifact.", "min": 0, "max": "*", "type": [ { "code": "BackboneElement" } ] }, { "path": "DecisionSupportRule.action.actionIdentifier", "definition": "A unique identifier for the action.", "min": 0, "max": "1", "type": [ { "code": "Identifier" } ] }, { "path": "DecisionSupportRule.action.number", "definition": "A user-visible number for the action.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.supportingEvidence", "definition": "Supporting evidence for the action.", "min": 0, "max": "*", "type": [ { "code": "Attachment" } ] }, { "path": "DecisionSupportRule.action.documentation", "definition": "Supporting documentation for the action.", "min": 0, "max": "*", "type": [ { "code": "Attachment" } ] }, { "path": "DecisionSupportRule.action.participantType", "short": "patient | person | practitioner | related-person", "definition": "The type of participant in the action.", "min": 0, "max": "*", "type": [ { "code": "code" } ], "binding": { "strength": "required", "description": "The type of participant for an action in the module", "valueSetReference": { "reference": "http://hl7.org/fhir/ValueSet/cds-rule-participant" } } }, { "path": "DecisionSupportRule.action.title", "definition": "The title of the action.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.description", "definition": "A short description of the action.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.textEquivalent", "definition": "A text equivalent of the action to be performed.", "min": 0, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.concept", "definition": "Concepts associated with the action.", "min": 0, "max": "*", "type": [ { "code": "CodeableConcept" } ] }, { "path": "DecisionSupportRule.action.type", "short": "create | update | remove | fire-event", "definition": "The type of action to perform (create, update, remove).", "min": 0, "max": "1", "type": [ { "code": "code" } ], "binding": { "strength": "extensible", "description": "The type of action to be performed", "valueSetReference": { "reference": "http://hl7.org/fhir/ValueSet/cds-rule-action-type" } } }, { "path": "DecisionSupportRule.action.resource", "definition": "The resource that is the target of the action (e.g. CommunicationRequest).", "min": 0, "max": "1", "type": [ { "code": "Reference", "profile": [ "http://hl7.org/fhir/StructureDefinition/Resource" ] } ] }, { "path": "DecisionSupportRule.action.customization", "definition": "Customizations that should be applied to the statically defined resource.", "min": 0, "max": "*", "type": [ { "code": "BackboneElement" } ] }, { "path": "DecisionSupportRule.action.customization.path", "definition": "The path to the element to be customized.", "min": 1, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.customization.expression", "definition": "An expression specifying the value of the customized element.", "min": 1, "max": "1", "type": [ { "code": "string" } ] }, { "path": "DecisionSupportRule.action.actions", "definition": "Sub actions.", "min": 0, "max": "*", "nameReference": "action" } ] } }
Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.