Re: [oXygen-user] RNC-DTD problem

27 Apr 2004

      Hi Xavier,

The only way you mixed content can be specified in a DTD is like:

<!ELEMENT element (#PCDATA|child1|child2|child3)*>

In words that will be zero or more #text or child1 or child2 or child3 (and
so on).
...
default namespace = ""
start =
  element Vertices {
    (text
     | element Vertex {
         (text
          | element Data {
              attribute Constant { text },
              attribute Name { text },
              attribute Vector { text }
            })+
       })+
  }
The problem with this is that the model is one or more instead of zero or
more. If you change the + to * then the conversion should work.
...
default namespace = ""
start =
    element Vertices {
        text,
        element Vertex {
            text,
            element Data {
                attribute Constant { text },
                attribute Name { text },
                attribute Vector { text }
            }
        }
    }
In this case you have a sequence model, a text node followed by an element
in both cases. This is not supported by DTDs, so changing , (group) to |
(choice) will make the conversion work.

default namespace = ""

start =
    element Vertices {
        text |
        element Vertex {
            text |
            element Data {
                attribute Constant { text },
                attribute Name { text },
                attribute Vector { text }
            }
        }
    }

will give you:

<?xml encoding="UTF-8"?>

<!ELEMENT Vertices (#PCDATA|Vertex)*>
<!ATTLIST Vertices
  xmlns CDATA #FIXED ''>

<!ELEMENT Vertex (#PCDATA|Data)*>
<!ATTLIST Vertex
  xmlns CDATA #FIXED ''>

<!ELEMENT Data EMPTY>
<!ATTLIST Data
  xmlns CDATA #FIXED ''
  Constant CDATA #REQUIRED
  Name CDATA #REQUIRED
  Vector CDATA #REQUIRED>

Best Regards,
 George
-------------------------------------------------------------
George Cristian Bina mailto:george@oxygenxml.com
<oXygen/> XML Editor - http://www.oxygenxml.com/