Conal Tuohy <[EMAIL PROTECTED]> writes: > Peter Hunsberger wrote: > > > Conal Tuohy <[EMAIL PROTECTED]> wrote: > > > > > Alfred Fuchs wrote: > > > > > > > in my expamle I extract the title of a HTML page in this way: if > > > > <title> exist and <title> not empty, use it as title. > > otherwise use > > > > the first <h1> etc... this is logic, simply done in a xslt, > > > but hoe to > > > > do this in a single xpath-query? > > > > > > string(/html/head/title[normalize-space()]|/html/body//h1[1]) > > > > Except that will get both when both exists, which I don't > > think is what > > he wanted... > > He should only get the title if the title exists: > > The first sub-expression > "/html/head/title[normalize-space()]" defines a nodeset > containing any non-whitespace title element. > > The second expression "/html/body//h1[1]" selects a nodeset > containing the first heading 1. > > The | operator merges the 2 nodesets. > > The string() function returns the string value of the FIRST > NODE in the resulting nodeset.
Ahh, that would do the trick. I believe in some old implementations (Xerces/Xalan) I've run into that wasn't the case; I'm pretty sure I've seen the union of the strings. Might be a tad expensive, but most likely he can be more specific on the path to the h1...
