[OASIS Issue Tracker] Commented: (TOSCA-53) How to represent "invariant "

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    [ http://tools.oasis-open.org/issues/browse/TOSCA-53?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31286#action_31286 ] 

Paul Lipton  commented on TOSCA-53:
-----------------------------------

Due to standing rules, this will be tentatively scheduled for the meeting of October 4th unless resolved to the reporter's satisfaction by comment prior to that date. 

> How to represent "invariant "
> -----------------------------
>
>                 Key: TOSCA-53
>                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-53
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Improvement
>    Affects Versions: CSD05
>            Reporter: Paul Zhang
>
> In CSD4, "properties defined by an Artifact Type are assummed to be invariant across the contexts in which corresponding artifacts are used". So, we can define a "const" attribute  to mean the corresponding element MUST be invariant. For example, an ArfifactType with PropertiesDefinition which cannot be invariant can be defined as: 
> <ArtifactType name="RPMPackage">
>      <DerivedFrom typeRef="ba:OSPackage"/>
>     <PropertiesDefinition element="map:RPMPackageProperties" const="true"/>
> </ArtifactType>
> Additionally, this method can also cover the Mr. Tad Deffler [defta01@ca.com]'s suggestion, i.e. if a ServiceTemplate (or xxxType) developer does not want others to modify his/her definition, how to guarantee this? (details can be seen in the email of Mr. Tad Deffler). So, a NodeType element can be defined as 
> <NodeType name="xs:NCName" targetNamespace="xs:anyURI"? abstract="yes|no"? final="yes|no"? const="yes|no"?>
> A serviceTemplate element can be defined as 
> 	<ServiceTemplate id="xs:ID"
> 	                 name="xs:string"?
> 	                 targetNamespace="xs:anyURI"
> 	                 substitutableNodeType="xs:QName"?
>                          const="yes|no"?> 
> Other elements can be defined similarly. 
>  

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