At 2010-02-04 09:29 +0000, Andrew Welch wrote:
>> Could you do a fn:prefix-from-QName($x) = fn:in-scope-prefixes(.)
>> check before doing the castable as check?
>
> Nope:
>
> http://www.w3.org/TR/2007/REC-xpath20-20070123/#id-castable
> "[if] the input argument of the expression is of type xs:string but it is
> not a literal string, the result of the castable expression is false."
To help me understand that :-)
Not a problem, Andrew ... I get asked about this terminology in the classroom.
can you provide an example of a user
constructed string that is not a string literal?
For example, tokenizing a string into a sequence of strings... they
are all string literals aren't they?
Nope ... a string literal is "literally a string in the stylesheet"
written with string delimiters. The term "literal" here is in
reference to the XPath written syntax.
A sequence of strings is just that: a sequence of string values in memory.
A literal string in the stylesheet is just that: a string value
literally delimited in the stylesheet. See production 74 of the XPath syntax:
http://www.w3.org/TR/2007/REC-xpath20-20070123/#doc-xpath-StringLiteral
The difference is a syntax issue: a string literal is a type of
primary expression (production 41) written in the stylesheet syntax
and it is the way to represent a string value in the XPath syntax
different from the representations of other literal values.
I hope that clarifies the distinction.
. . . . . . . . . . Ken
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