fix_base_path: multiple patterns

Try do define multiple nested tags with needed patterns.

[language=xml:3bxr5yn6] Content to apply the tags to

[/language:3bxr5yn6]

On the other hand recent versions of PD4ML are able to resolve absolute web paths via ServletContext. I would recommend to add debug=”true” to and ispect STDOUT what it tries to load and whether the URLs are correct.