dbhtml-include_href — Copies an external well-formed HTML/XML file into current doc
<?dbhtml-include href="URI"?>Use the <?dbhtml-include href?> PI anywhere in a
      document to cause the contents of the file referenced by the
      href pseudo-attribute to be copied/inserted “as
      is” into your HTML output at the point in document order
      where the PI occurs in the source.
The referenced file may contain plain text (as long as
        it is “wrapped” in an html element — see the
        note below) or markup in any arbitrary vocabulary,
        including HTML — but it must conform to XML
        well-formedness constraints (because the feature in XSLT
        1.0 for opening external files, the
        document() function, can only handle
        files that meet XML well-formedness constraints).
Among other things, XML well-formedness constraints
        require a document to have a single root
          element. So if the content you want to
        include is plain text or is markup that does
        not have a single root element,
        wrap the content in an
          html element. The stylesheets will
        strip out that surrounding html “wrapper” when
        they find it, leaving just the content you want to
        insert.
URI"Specifies the URI for the file to include; the URI
            can be, for example, a remote http:
            URI, or a local filesystem file:
            URI