Michael Van Canneyt wrote 24 lines
I haven't given much thought yet, so I will think something up, while typing. ;-)
What I tried was this:
http://www.freepascal.org/cgi-bin/viewcvs.cgi/trunk/docs/xml/lcl/xmlpropstorage.xml?root=lazarus&rev=8903&view=diff&r1=8904&r2=8902&p1=trunk/docs/xml/lcl/xmlpropstorage.xml&p2=/trunk/docs/xml/lcl/xmlpropstorage.xml
But that didn't work, so I started reading the docs about the <seealso> tag and the <link> tag. I think that can be extended to allow external links, or maybe you want to give it a different name: <externallink id="#wiki:TXMLPropStorage">My descriptive text</externallink>. The part before the colon must be externally configurable, so that you don't need to change the xml files, if the hosting server changes. Actually just like xct file references to other packages.
For example:
fpcmake --externallink="wiki=http://wiki.lazarus.freepascal.org/index.php/"
Vincent.