5.5. Implicit

This defines a tag as implicit, meaning it can just be an attribute instead of an attribute=value pair. It must be a recognized attribute in the tag definition, or there will be big problems. Use this with caution!

    UserTag tagname Implicit attribute value

If you want to set a standard include file to a fixed value by default, but don't want to have to specify [include file="/long/path/to/file"] every time, you can just put:

    UserTag include Implicit file file=/long/path/to/file

and [include file] will be the equivalent. You can still specify another value with [include file="/another/path/to/file"].