Re: [xml] xpath contains() function

[Daniel Veillard <veillard redhat com>]

On Mon, Nov 05, 2001 at 11:38:06AM -0700, Vakoc, Mark wrote:
> I seem to get differing results from various processers when using the xpath
> contains() function with the second string as an empty string.  I checked
> the spec( http://www.w3.org/tr/xpath#function-contains and it makes no
> mention of this case.
>
> Other processors tested evaluate contains('test','') to false, while libxml
> returns true which doesn't seem correct to me.  Any idea on who is correct?

  libxml is correct, they are wrong, please give them bug reports:
    http://www.w3.org/1999/11/REC-xpath-19991116-errata/
    Section 4.2
    Add the following to the description of the contains function:
    If the second argument string is the empty string, then true is returned.

which simply makes sense because any string contains an empty string.
Kind of a topological definition the empty set contains the empty set.

Daniel

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