Re: Nasty XPath expressions
On Thu, 13 Dec 2001, Kelvin Yeow wrote: > I wonder what XPath expressions would cause an "XPath processor" to sweat? > Any "XPath processor" developer out there? Howdy, I'm Bob, one of the developers of Jaxen (http://jaxen.org/), a 'universal' XPath engine for Java. The biggest issue we've had (it's Today's Big Issue) is regarding document-ordering when using a union expression. $foo/bar | $cheese/melty XPath says that nodes should be returned in 'document order', which becomes a non-trivial in the case of some expressions involving the union operator. One developer has a solution, but it is of O(tree-size) complexity. Do that against a 30mb document, and suddenly XPath isn't nearly as attractive. Long/complex xpaths, or xpaths involving '//' and such aren't really that hairy. -bob
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