TODO: Need a way to declare the "schema" namespace apart from the version of the TOSCA (grammar) that the service template is declared to be composed with.

e.g. tosca_simple_1_0

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As TOSCA normative type are essential to simplified grammar, could this keyname be used to automatically import the normative types that aligned with/matched the same schema version?

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Can we use this key (implied) to also bring in the matchin TOSCA normative definitions (that was defined with the same schema version)?

<or> <and> could override with explicit import in service template import section.