[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Validating IDREFS...
Tyler Baker writes: > > You need to maintain a hash table of IDs in order to enforce the ID VC > > (uniqueness of IDs). To check matching of IDs you just add a boolean > > that says whether the ID has been defined yet. At the end of the > > document, iterate over the hash table and give an error for each > > undefined ID. > > This I know is one idea to get around this problem and this is > basically my current implementation as well, but shouldn't a > validating XML parser flag an error if an IDREF does not have a > corresponding ID when the error occurs. In other words, I would > think that deferring errors before the content is passed to the > document would be illegal. Here are three points to note: 1. It is more important to pass information to the application about _where_ the error occurs, and you can keep that information in the hash table. 2. In a tree-based API, the error will be spotted before the tree is completed, so the application will know about the error right at the start before it can work with the tree. 3. In a stream-based API, the error will be obvious when you have parsed the end tag of the document element -- you can report the error before you report the element end. All the best, David -- David Megginson david@m... http://www.megginson.com/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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