Creating a Generator completed

[Berin Loritsch]

This is one that I think could use a second pair of eyes to make it more 
understandable.  The URL is here:

http://cocoon.zones.apache.org/daisy/documentation/writing/sitemapcomponents/688.html
I also had to introduce the XML Pipeline contracts documentation here:

http://cocoon.zones.apache.org/daisy/documentation/writing/corecontracts/689.html

Now this is something where the JavaDocs should be updated to reflect it.