RE: How expensive is //?
> Is // (memory) equivalent to /Records/Record when there is > only one Records, and only one child Record? > It depends entirely on your processor. For Saxon: the first time you do //x on a given document (for a given x) it searches the whole document looking for elements named x. In the majority of cases, this will take longer than an explicit path expression such as /a/b/c/x. However, the list of x elements that it finds is saved as a kind of index, linked to the document node, so that the next time you do //x on the same document it already knows the answer: which is therefore cheaper than repeating the /a/b/c/x query. This also applies if the //x is part of a longer path expression. But you seem to be suggesting that your document is tiny, in which case none of this makes any measurable difference. Do you actually have a performance problem, and if so what is it? Michael Kay http://www.saxonica.com/
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