Handle import tags in schema

[suleman-uzair]

Handle imports in XSD schemas.

Originally posted by @ronaldtse in lutaml/lutaml-xsd#2 (review)

[suleman-uzair]

@ronaldtse, do you have any thoughts on how to handle the imports?

1. Import the schemas recursively?
   a. Import the schema or document from the input. If any imports exist within that schema or document, continue importing recursively.
2. Handle like shale does, as discussed in Implement XSD parsing and lutaml-model generation functionality #37 (comment)

[ronaldtse]

I think the xsd gem should have a functionality called "flatten" that unrolls the imports. Then the lutaml-model gem can directly import that XSD just once?

[suleman-uzair]

I think the xsd gem should have a functionality called “flatten” that unrolls the imports. Then the lutaml-model gem can directly import that XSD just once?

@ronadltse, Sounds good.
I’ll start working on it right away and move back to XSD compiling functionality ( in Lutaml-Model ) once it’s finalized.