SCE — Incorrect Mapping from Metamodel to XSD

The current SCE XSDs were developed with a faulty translation of UML class relationships to the XSD elements.
To resolve this issue we need to specify the XSD patterns that correspond to the UML class relationships and then update the XSDs.

Use same MM-XSD Mapping as in BPMN, CMMN & DMN

Use the MM-XSD mapping approach that BPMN pioneered for the BPM+ ecosystem to remain backwards compatible (for SCE-40) and allow vendors to reuse their existing language tooling based on that mapping. SDMN is following the same approach in SDMN-111.