XML properties in the schema
When you open a schema in the schema designer after you imported it from a DTD or XML Schema, the XML-specific properties are displayed as read-only fields.
For each type in the resulting schema, the Intent property is either General (indicating non-XML) or XML. All category types that are created during the import process are considered non-XML properties. All group and item types that are created during the import process are considered XML properties.
Any types that you manually add to the XML type tree are considered non-XML and have General intent. In such a case where there are both XML and non-XML types present (such as EDI data), the appropriate method of validation is determined automatically.