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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." 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? 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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