Which variables are available, e.g. for the xdoclet-maven-plugin?

[Stefan Rademacher <Ra...@hhla.de>]

Hello,

on the page for the xdoclet-maven-plugin there is an example, which
contains a variable ${project.build.outputDirectory}.
Where can I find out generally, which variables are available in a
pom.xml? And another question is: Can I define my own variables
somwhere?

Would be great, if anyone can tell me.
Bye,
Stefan

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