Including other XML files
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Limitations
The use of the <include ...> XML tag is allowed almost everywhere, but not arbitrarily anywhere.
You can use it:
In the main
*.world.xmlworld definition file, anywhere as a direct child node of the top-level<world>tag.As a child of these XML tags: -
<vehicle>-<vehicle:class>-<block:class>As a top level entry in any other included file.