Enable loading more than one xml source schema

[JohannaOtt]

It currently is not possible to load more than one xml source schema except for creating a combined schema in which all schemas needed for the transformation get imported. This is e.g. necessary when source data is retrieved from several WFS (which will likely get a more frequent use case in the next months and years where data is increasingly published using services).

The implementation could either be to add a function that creates a combined schema that users can then use afterwards or not letting the user know at all about the existance of a combined schema that is created and used in the backgorund.

If it is easy to implement together, it might make sense to implement the same functionality for target schemas - but the source schema use case is definitely occurring more often.

[thorsten-reitz]

@stempler any idea how much effort this would be?

[stempler]

@thorsten-reitz can you describe the use case (where the workaround is not feasible)? It would be helpful to have the requirements clear. To get a clear picture related to the implementation effort best way would be to start an experiment, e.g. to clarify if there are any side effects to replacing the loaded schemas at runtime.

[thorsten-reitz]

@stempler My main use case has also been Johannas ("This is e.g. necessary when source data is retrieved from several WFS"). The woraround works, but can be a lot of work in this case. I've had one project with more than 40 different WFSes a while back.

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