CHTML works by transforming static HTML documents residing on the server into 
dynamic HTML documents that are actually seen by the user.  This is similar to 
but different from server-side-include (e.g. shtml) or web-sql/gsql mechanisms 
in that it: 

      * avoids embedding into HTML the kinds of directives which only 
        programmers would be comfortable with. 
      * avoids overly extending HTML semantics in a way that prevents the 
        documents from being edited by wysiwyg tools. 
      * only uses templates that are complete and valid stand-alone HTML 
        documents. Therefore the documents can be verified as to HTML
        level conformance independently from running the scripts that use them. 

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