[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: SAX2: DTDDeclHandler (minimalist position)
* David Megginson | | I'm still shying away from reporting element-type declarations, at | least until someone shows me an easy and concise way of doing it (in | AElfred, I simply provided the content model as a fully-normalised | string). This is difficult in Java, mainly because of a gross deficiency in the language: the difficulties of representing general nested list structures in memory. Over-emphasis on objects has some ugly side-effects. I think this would be easier in C, even. (Arrays and unions should do it.) xmlproc uses Python lists and tuples to do this: <URL: http://www.stud.ifi.uio.no/~larsga/download/python/xml/xmlproc-dtd-doco.html#ElementType> and similarly easy solutions are easily imaginable in other scripting languages, as well as industrial-strength ones like Common Lisp. For Java I suppose the string solution is the most natural one. I don't think that approach will be chosen in the Python version, though. Also, if element declarations are included, I suppose notations should be, too. Shouldn't be very hard, and I think the benefits are great enough that both should be included. This should be enough to present a SAX 1.0-like view of DTDs, more or less without lexical information, and still be simple enough to warrant the name SAX. | public interface DTDDeclHandler | { | public final static int ATTRIBUTE_DEFAULTED = 1; | public final static int ATTRIBUTE_IMPLIED = 2; | public final static int ATTRIBUTE_REQUIRED = 3; | public final static int ATTRIBUTE_FIXED = 4; | | public abstract void attributeDecl (String element, | String name, | String type, Here we need some convention for representing enumerations. "ENUMERATION" will probably do. :) | public abstract void externalEntityDecl (String name, | boolean isParameterEntity, | String publicId, | String systemId) | throws SAXException; I think it would be more natural to have separate callbacks for parameter entities. It makes the interface grow, but I think it is more intuitive to learn (the first look at the javadoc shows how it works, you don't have to study the parameters in detail to figure it out) and also more natural to use. | public abstract void internalEntityDecl (String name, | boolean isParameterEntity, | String value) | throws SAXException; Should value be named 'replacementText', just to make it clearer what it is? --Lars M. 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/ and on CD-ROM/ISBN 981-02-3594-1 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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