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Re: [xsl] XPath 1.0 challenge: select all XML Schema element declarations with type string


Subject: Re: [xsl] XPath 1.0 challenge: select all XML Schema element declarations with type string
From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Jul 2015 17:28:00 -0000

Thanks for the outstanding responses.

Let's summarize:

1. The problem cannot be solved in XPath 1.0.

2. XPath 1.0 is not "relationally complete" in Codd's sense.

3. The following two XPath expressions come close to solving the problem.
However, sometimes they return an element which should not be returned and
sometimes they don't return an element which should be returned.

(a) //xs:element[(@type = 'string') or (substring-after(@type, ':') =
'string')]

(b) //xs:element[@type= concat(substring-before(name(),'element'),'string')]

I must use XPath 1.0.  So which of those two XPath expressions would you
recommend I use?

Michael says that (b) is a 99.9% solution. Is (a) less than, greater than, or
equal to 99.9%? That is, which of (a) or (b) will work correctly most often?

/Roger


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