Parsing canonical XMI for UML models

[ronaldtse]

This issue is to parse XMI in a way similar to Expressir -- to allow LutaML to read in XMI and make the UML model tree available for navigation.

The intention is to allow people to use Enterprise Architect to create *.{eap,eapx} files, and then export to XMI 2.4.2 or 2.5.1, and then LutaML can directly parse the XMIs.

We have prepared the Metanorma Requirements Model in different formats for this task:

• (for information only) Enterprise Architect https://github.com/metanorma/metanorma-requirements-models/tree/master/models/ea
• XMI 2.4.2: https://github.com/metanorma/metanorma-requirements-models/blob/master/models/xmi/ea-xmi-2.4.2.xmi
• XMI 2.5.1: https://github.com/metanorma/metanorma-requirements-models/blob/master/models/xmi/ea-xmi-2.5.1.xmi
• PlantUML version: https://github.com/metanorma/metanorma-requirements-models/blob/master/models/requirements.wsd
• LutaML UML version to be created

[w00lf]

This one was implemented as a new gem - lutaml/lutaml-xmi, @ronaldtse can we close this one?

[ronaldtse]

Agree. Thanks!