Re: Use of data() function

Mukul Gandhi wrote:

> test="" would test for EBV of the expression in "". That is
> the semantics of test="" syntax.

  Yes.  As well as for a few XPath constructs.  The idea is that from
any sequence you want to have just 'yes' or 'no.'  You don't have to
provide an expression that results in a singleton xs:boolean.  The
rules are something like:

    - if empty($seq) -> false
    - if non-empty sequence of nodes -> true
    - if singleton number -> flase if 0 or NaN
    - if singleton string or URI -> false if ''
    - if singleton boolean -> that boolean's value
    - else: type error

  See http://www.w3.org/TR/xpath20/#id-ebv for details.  Note in
particular that you can't have a sequence of atomic values.

  Without the EBV, you should provide a singleton xs:boolean each time
you use xsl:if, if, xsl:when, and, predicates, etc.  For instance
test="@married" would be an error; you should say
test="exists(@married)" or test="xs:boolean(@married)" instead.

  Regards,

--drkm






















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