- From: Joseph Reagle <reagle@w3.org>
- Date: Wed, 28 Nov 2001 17:13:04 -0500
- To: xmlschema-dev@w3.org, henry@w3.org
- Cc: xenc <xml-encryption@w3.org>
How do I extend descendents of a complex type? I have an abstract type EncryptedType which relies upon a definition of a CipherDataType. <complexType name='EncryptedType' abstract='true'> <sequence> <element ref='xenc:CipherData'/> <element ... /> </sequence> </complexType> <element name='CipherData' type='xenc:CipherDataType'/> <complexType name='CipherDataType'> <choice> <element name='CipherValue' type='base64Binary'/> <element ref='xenc:CipherReference'/> </choice> </complexType> From this abstract type, I derive two related but slightly different complexTypes. One of the derived types, EncrypteKeyType is a straightfoward extension, I'm adding children and attributes to the EncryptedType. *However*, the other type is tricky. EncryptedDataType needs nothing more complex than an Nonce attribute added to its CipherData. Simple requirement, but complex in practice I'm finding. Can I do this sort of overload and nesting, or do I need to do something else, and what is recommended? <element name='EncryptedData' type='xenc:EncryptedDataType'/> <complexType name='EncryptedDataType'> <complexContent> <extension base='xenc:EncryptedType'> <sequence> <element name='CipherData'> <complexType> <complexContent> <extension base='xenc:CipherDataType'> <attribute name='Nonce' type='integer' use='optional'/> </extension> </complexContent> </complexType> </sequence> </extension> </complexContent> </complexType> If I can't do something like this, I expect I need to make CipherDataType and abstract type as well, and then each derivation of EncryptedType will also use a derivation of CipherDataType... Does that sound right? Any better ideas? -- Joseph Reagle Jr. http://www.w3.org/People/Reagle/ W3C Policy Analyst mailto:reagle@w3.org IETF/W3C XML-Signature Co-Chair http://www.w3.org/Signature/ W3C XML Encryption Chair http://www.w3.org/Encryption/2001/
Received on Wednesday, 28 November 2001 17:13:07 UTC