File type check requires file ending

[Schmoho]

The code referenced below requires a file to both have the proper file name ending and for its content to be proper SBML/SBGN.
This seems unnecessarily restrictive to me, as the second check is arguably stronger - i.e. this could well do with "logical or" instead of "and".

https://github.com/draeger-lab/SysBio/blob/2d6520704440397ab7fcf0b59d6adbdd82942b1a/src/de/zbit/io/filefilter/SBFileFilter.java#L911C1-L925C4

This came up in downstream development on the ModelPolisher.

[Clemens82]

My two cents:
Yes, a logical or would be less restrictive and also detect correct files even if they have a different extension.

However, please consider the architectural design of those filefilters. Aren't they applied as soon as the browser window is opening a folder? Consider a folder with thousands of files. The second check would require the filefilter to open all those files in order to do a content base check.