def count_content_words(node)
     ws = count_words(node)
     # Count the remark text contained in the paragraph and subtract it from the real thing
     wsr = node.find('db:remark').reduce(0) {|m,r| m+count_words(r)}
     ws - wsr
   end
def count_content_words(node)
     ws = count_words(node)
     # Count the remark text contained in the paragraph and subtract it from the real thing
     wsr = node.find('db:remark').reduce(0) {|m,r| m+count_words(r)}
     ws - wsr
   end
Counts the words in the contents of the given node.
 It is assumed that the node is a kind of pure content (a paragraph) and therefore everything in it
 should be included in the word count. An exception to this are
 _remark_ elements, which are conisdered as comments, not meant for final publication.