[OASIS Issue Tracker] Commented: (TOSCA-19) The current version of TOSCA does not support to share EnvironmentConstraint among several NodeTemplate. This document presents a method to realize the element sharing.

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    [ http://tools.oasis-open.org/issues/browse/TOSCA-19?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=30568#action_30568 ] 

Derek Palma commented on TOSCA-19:
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Are you trying to model two applications in the same Service Template? What I mean is if this would be like two SugarCRMs if yo look at our SugarCRM usecase. 

It is fine to have multiple apps in the same template, it just means you won't be able to deploy them separately. This may or may not be a consideration.

You'll need to have some NodeTypes and RelationshipTypes (either your own or the proposed ones) in addition to your templates. 

We are thinking to add a new kind of constraint which can reference properties from other nodes in the current context. The context would be defined by the containing node, i.e. hostedOn one or any others in this hierarchy.

If you want a "root node" (which is natural and expected) you can get it by using the ApplicationContainer NodeType, again from the set of proposed NodeTypes (see https://tools.oasis-open.org/issues/browse/TOSCA-12) 

> The current version of TOSCA does not support to share EnvironmentConstraint among several NodeTemplate. This document presents a method to realize the element sharing. 
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: TOSCA-19
>                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-19
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Improvement
>            Reporter: Yi Zhang
>            Priority: Minor
>
> In the current version of TOSCA, the EnvironmentConstraint in EnvironmentConstraints is defined in a NodeTemplate. So, if several NodeTempalte have the same EnvironmentConstraint, this EnvironmentConstraint should be defined in each NodeTemplate. Therefore, one EnvironmentConstraint is defined several times totally. 

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