This will return an alphabetical list of all file categories in the referenced project.
<attachment-categories>
<attachment-category>
...
</attachment-category>
<attachment-category>
...
</attachment-category>
...
</attachment-categories>
This will return an alphabetical list of all message categories in the referenced project.
<post-categories>
<post-category>
...
</post-category>
<post-category>
...
</post-category>
...
</post-categories>
This will return a list of all active, on-hold, and archived projects that you have access to. The list is not ordered.
<projects>
<project>
...
</project>
<project>
...
</project>
...
</projects>