Re: SAX: Attributes and Entity Resolution
David Megginson wrote: > While I agree that a full entity manager would be more powerful than a > simple callback, I am not certain that the power will really be needed > by most SAX users; furthermore, if it is needed, that functionality > can be supplied more generally by an HTTP or FTP proxy server. For > now, then, I recommend that we stick with the resolveEntity callback, > which is simple to use and to learn, but provides 80% of the required > functionality (that's 80% in the abstract 80/20 sense). I don't think the entity manager interface has to be any more complicated than a single resolveEntity callback. My main point is that this doesn't belong as part of the App. Putting separate pieces of functionality into separate interfaces does not make things harder to use and learn; on the contrary it makes it easier. > public void attribute (String elementName, String aname, String value); > > For example, with the following markup > > <para id="p1" level="advanced">This is a paragraph.</para> > > We would have five SAX events: > > attribute: elementName="para" aname="id" value="p1" > attribute: elementName="para" aname="level" value="advanced" > startElement: name="para" Putting attributes before the start element would be seriously confusing: in the markup the element name comes before the attributes, and the attributes are logically part of the element. Having an attribute callback that happens after the startElement makes some sense. It is to some extent arbitrary whether information is represented as subelements or attributes; having subelements and attributes be represented in a similar way would be consistent with this. I think I would also pass the element type name as an additional argument to the attribute call, since the name of an attribute is in general meaningful only in the context of a particular element type. It's also useful to know when the attributes have ended and the content is starting, and I would have a callback for this that also passed the element type name. This isn't pretty. An alternative simple approach would be to have startElement(String elemName, String attNames, String attVals, int nAtts); As with the charData callback, the parser would be free to mutate the arrays once the startElement method returns, and so it would not need to allocate two arrays for every element. James 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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