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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: I have implemented SAX based XPath Engine
 Looks like a nice piece of work (if it
works)
A few questions:
(a) I note that you support multiple downward selections in
a predicate, for example
/root/pub[book/name and book/author]//book I would be interested to know whether you do this in a pure
streaming way, or whether you build an in-memory tree for any element that has
such a predicate. (Saxon's streamable subset of XPath currently doesn't allow
multiple downward selections).
(b) You've got an example that does
*[last()]. Do you allow *[last() - 1]? Is this done with a pure
streaming approach?
And a couple of comments:
(c) When you say "XPath", you seem to mean "XPath 1.0". It
would avoid confusion to say that explicitly.
(d) I would think that a common way to use a SAX-based
XPath engine is to filter the events, so that events are passed on to the next
stage in the SAX pipeline only if they belong to nodes selected by the XPath
expression. You don't seem to support this in your API.
Michael Kay
http://www.saxonica.com/
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