[OASIS Issue Tracker] (TOSCA-190) Fix grammar for "Constraints" on a Target node of a requirement (Chapter 11)

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

    [ https://issues.oasis-open.org/browse/TOSCA-190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=48246#comment-48246 ] 

Matthew Rutkowski  commented on TOSCA-190:
------------------------------------------

These discussions seems to make us work on https://issues.oasis-open.org/browse/TOSCA-152 ("Extend Requirement grammar to support "Optional/Best Can" Capability Type matching ") as a base capability to enable more expressivenes of target filters.h

> Fix grammar for "Constraints" on a Target node of a requirement  (Chapter 11)
> -----------------------------------------------------------------------------
>
>                 Key: TOSCA-190
>                 URL: https://issues.oasis-open.org/browse/TOSCA-190
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Task
>          Components: Profile-YAML
>    Affects Versions: CSD03
>            Reporter: Matthew Rutkowski 
>            Assignee: Thomas Spatzier 
>            Priority: Critical
>
> Section 11  of WD03, Rev05 has the following example which shows constraints on a requirement.  The intent is to constrain the properties used for finding/matching the Target (Compute) node of a relationship.  If we still want to allow this, we have no grammar for doing this and need one. Also, the grammar implied by the example perhaps is not sufficient to indicate that these constraints are on the properties of the Target node.  
> Here is the example as written:
> node_templates:
>   mysql:
>     type: tosca.nodes.DBMS.MySQL
>     properties:
>       # omitted here for sake of brevity
>     requirements:
>       - host: tosca.nodes.Compute
>         constraints:
>           - num_cpus: { in_range: [ 1, 4 ] }
>           - mem_size: { greater_or_equal: 2 }
>           - os_arch: x86_64
>           - os_type: linux
>           - os_distribution: ubuntu



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