how to know which tags and tag attributes are valid?

[Patrick]

I am going through the hotwax tutorial,
http://www.hotwaxmedia.com/apache-ofbiz-blog/category/ofbiz-tutorials/,
 and I just learned that <order-by> is a sub-tag of
<entity-condition>.  I also learned that <order-by> has attribute
"field-name".  Where can I find a list of all the valid tags and
sub-tags?  Also where can I find a list of all the valid tag
attributes?  Also, I know this is a long shot, but is there anyway to
hook up OfBiz so that there is autocompletion of tags and tag
attributes?