Hi Mark, Mark Brucks <bru...@charter.net> wrote on 09/09/2009 07:03:53 PM:
> I want to know what the legal values are (the key values) that are > valid for a given keyref that references said key. I haven't been > able to find any methods in the DOM or the Schema interfaces that > could be combined to derive the answer. Right. Xerces has no such API. I don't know of any API which exposes this information. > And since the answer depends > on info from both the schema and the document instance, I suspect > there are no existing methods. So my next question... > > Is there any document that explains key/keyref in more detail? Aside from the spec? :-) There are some tutorials and presentations [1] referenced from the W3C website that you may find useful. I've never looked at them though. > Actually, what I would prefer is something that falls between the > complexity of "XML Schema Part 0 - Primer" and "XML Schema Part 1 - > Structures". Despite the huge conceptual gap between those two > documents, both have key/keyref examples that are simple - both the > key and keyref are defined on the same element, and that element is > always the root node. From my initial reading of Part 1, the keys > must be defined on self-or-descendant modes of the keyrefs. But it > doesn't explain any required relationship between the target node sets > (qualified node sets) of the key and keyref. It's defined in the spec [2][3] though admittedly challenging to decipher and not easily explained in plain English. > I still don't understand, in the general case, how to determine > the context node used for evaluation of the key selector xpath. The context node for a selector XPath is each element node in the instance whose corresponding element declaration contains the identity constraint with that selector XPath. > Any help, whether pointers to existing xerces methods or > recommendations for other documentation to read would be appreciated. > > Thanks - Mark Brucks > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: j-users-unsubscr...@xerces.apache.org > For additional commands, e-mail: j-users-h...@xerces.apache.org Thanks. [1] http://www.w3.org/XML/Schema#usage [2] http://www.w3.org/TR/xmlschema-1/#cl-krv [3] http://www.w3.org/TR/xmlschema-1/#sic-key Michael Glavassevich XML Parser Development IBM Toronto Lab E-mail: mrgla...@ca.ibm.com E-mail: mrgla...@apache.org
