PHPDoc and it's sitemap.xml
Not all pages are getting listed within the sitemap.xml document.
Looking through the https://phpdoc.apiopenstudio.com/indices/files.html page, we can see that all files seem to being parsed.
We can also see them via the namespaces page (i.e. https://phpdoc.apiopenstudio.com/namespaces/apiopenstudio-processor.html).
However, sitemap.xml is only showing a very small portion of the available pages and links.
Attached, is the verbose output from the sitemap generator, which may yield some clues into the causes: output.txt