Please elaborate.

I use the online documentation to semi automatically generate the php syntax file for the midnight commander. When comparing the newly generated output with the previous version of the mc php syntax files I noticed some of the PCRE constants were missing. This is caused by the absence of these tags in that particular page.

Which exactly are missing ?

In table 1 in http://www.php.net/manual/en/ref.pcre.php all the constants in the left column miss these tags. Only the constant mentioned in the right column of the third row is properly tagged. You can compare other pages as well if you need to.

From what I can see, there are lots of constants that are documented in such way.
Look for example at http://www.php.net/manual/en/ref.mysql.php and http://www.php.net/manual/en/ref.network.php .

I agree, this is a small incosistency, but this is definitely not a bug, since noone and nowhere told you that all constants will be enclosed with <constant></constant> tag.

Well, it would be convenient for such purposes as I described. Indeed I see more inconsistencies: ref.tidy.html is ugly as it tags some pseudo constants but not most of the real ones.

What's the use of the <TT CLASS="constant"> tag in some pages if it's not used consistently and you don't even want to make an effort to implement this consistently? Who maintains these documentation pages anyway? Can I help?

Maybe the consistent use of these tags should be promoted?

Of course your help would be appreciated.
Read here: http://www.php.net/manual/en/about.howtohelp.php
and here http://doc.php.net/php/dochowto/ about that.
Yes, I guess it'd be good to have all the docs consistent, so feel free to send your patches to the phpdoc@lists.php.net mailing list.

And Leonard, you will probably also find out that generating your files from the XML sources of the documentation is a much better idea, as it done by the phpedit.net team for example. Look at:

  http://www.waterproof.fr/products/PHPEdit/download.php
  (PHP Functions definition files maker)

It works from our XML sources.

I was already wondering what to create patches against. It seems a bit silly to supply patches against the html pages if these pages are generated from another source (XML).

What username 
Wshould I use to do anonymous checkouts? anoncvs, anon, anonymous, nobody, all don't seem to work. Sadly this is not mentioned at http://doc.php.net/php/dochowto/chapter-cvs.php .

Please ignore that last remark ;) . That page actually does have a pointer to the anonymous CVS account name.