Figure 1: Constraint Conformance Including "such that it" Syntax Example Open and Closed Templates In open templates, all of the features of the CDA R2 base specification are allowed except as constrained by the templates. By contrast, a closed template specifies everything that is allowed and nothing further may be included. Open templates allow HL7 implementers to develop additional structured content not constrained within this guide. HL7 encourages implementers to bring their use cases forward as candidate requirements to be formalized in a subsequent version of the standard to maximize the use of shared semantics. Conformance Verbs (Keywords) The keywords shall, should, may, need not, should not, and shall not in this document are to be interpreted as described in the HL7 Version 3 Publishing Facilitator's Guide. shall: an absolute requirement shall not: an absolute prohibition against inclusion should/should not: best practice or recommendation. There may be valid reasons to ignore an item, but the full implications must be understood and carefully weighed before choosing a different course may/need not: truly optional; can be included or omitted as the author decides with no implications The keyword "shall" allows the use of nullFlavor unless the requirement is on an attribute or the use of nullFlavor is explicitly precluded. When conformance statements are nested (or have subordinate clauses) the conformance statements are to be read and interpreted in hierarchical order. These hierarchical clauses can be interpreted as "if then, else" clauses. Thus... This structuredBody contain zero or one [0..1] component SHOULD such that it contain exactly one [1..1] Plan of Treatment Section (V2) SHALL (identifier: (CONF:1098-29067). ...is understood as: It is recommended (SHOULD) that the structureBody contains a component. If the component exists, then it must contain a Plan of Treatment Section (V2), else the component does not exist, and the conformance statement about the Plan of Treatment Section (V2) should be skipped. In the case where the higher level conformance statement is a SHALL, there is no conditional clause. Thus... This structuredBody contain exactly one [1..1] component such that it
Figure 1: Constraint Conformance Including "such that it" Syntax Example Open and Closed Templates In open templates, all of the features of the CDA R2 base specification are allowed except as constrained by the templates. By contrast, a closed template specifies everything that is allowed and nothing further may be included. Open templates allow HL7 implementers to develop additional structured content not constrained within this guide. HL7 encourages implementers to bring their use cases forward as candidate requirements to be formalized in a subsequent version of the standard to maximize the use of shared semantics. Conformance Verbs (Keywords) The keywords shall, should, may, need not, should not, and shall not in this document are to be interpreted as described in the HL7 Version 3 Publishing Facilitator's Guide. shall: an absolute requirement shall not: an absolute prohibition against inclusion should/should not: best practice or recommendation. There may be valid reasons to ignore an item, but the full implications must be understood and carefully weighed before choosing a different course may/need not: truly optional; can be included or omitted as the author decides with no implications The keyword "shall" allows the use of nullFlavor unless the requirement is on an attribute or the use of nullFlavor is explicitly precluded. When conformance statements are nested (or have subordinate clauses) the conformance statements are to be read and interpreted in hierarchical order. These hierarchical clauses can be interpreted as "if then, else" clauses. Thus... This structuredBody SHOULD contain zero or one [0..1] component such that it SHALL contain exactly one [1..1] Plan of Treatment Section (V2) (identifier: (CONF:1098-29067). ...is understood as: It is recommended (SHOULD) that the structureBody contains a component. If the component exists, then it must contain a Plan of Treatment Section (V2), else the component does not exist, and the conformance statement about the Plan of Treatment Section (V2) should be skipped. In the case where the higher level conformance statement is a SHALL, there is no conditional clause. Thus... This structuredBody contain exactly one [1..1] component such that it
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