Use Case: Sharing Nodes (e.g. a Database) between two separate (deployed) service templates

Desire to have one service template reference nodes or artifacts in another (already deployed) service template.

Example:
Sugar_eCard service template wishes to share an existing DB Node (instance) with already deployed SugarCrm service template.

Notes:
Aaron: High Level Suggestion: Extend TOSCA ServiceTemplate to support referencing to existing nodes.
Derek: generic deployed component to ref. an instance already deployed, need access credentials and simply need to connect (you own it or don't own).
Aaron: If you want to ref. an existing node, the intent was the node was owned by the same customer.
Matt: Perhaps there is a relationship with one of Derek's use cases involving access (control) to access a DB. That is the 2nd service template would need to know/pass credentials.

References:
https://www.oasis-open.org/apps/org/workgroup/tosca-interop/download.php/48504/New%20Scenarios%20for%20TOSCA%20from%20Huawei.pptxx