- From: <David.Cantrell@Gunter.AF.mil>
- Date: Fri, 25 Oct 2002 15:48:15 -0500
- To: xmlschema-dev@frink.w3.org
Hello again schemers, I am going through the XFront schema tutorial[0] and have hit a spot that I don't quite understand. Why are the simpleContent and extension elements required here: <xsd:complexType name="linkType"> <xsd:simpleContent> <xsd:extension base="xsd:string"> <xsd:attribute name="title" type="xsd:string" use="required"/> <xsd:attribute name="action" type="xsd:string" use="required"/> </xsd:extension> </xsd:simpleContent> </xsd:complexType> I'm not extending any types, at least not intentionally, so I'm not sure why it's required. The element I'm trying to create should look like this: <link title="foo" action="bar"/> There are no child elements or character data, the element will always be empty except for the two required attributes. Also, I don't quite understand exactly what the simpleContent element really does. The MSXML docs state: "Contains extensions or restrictions on a complexType element with character data or a simpleType element as content and contains no elements." I don't fully understand exactly what that means. Since there is no CDATA and it is not a simpleType, and definitely does not contain any child elements, I see no reason for this element to be required. However, if I eliminate either the extension or the entire simpleContent wrapper, the validation fails and reports I did not declare a root element (not shown in the above schema snippet)... :( Thanks, -dave [0] http://www.xfront.com/#schema
Received on Friday, 25 October 2002 16:48:32 UTC