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Re: XPath related query
Subject: Re: XPath related query
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Sun, 23 Jan 2011 18:38:04 +0000
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On 23/01/2011 14:14, Florent Georges wrote:
Vineet Chaoji wrote:
Hi,
So the query that I am trying to represent is: Is there a Book
"Book1" that has a chapter 'c1' that cites some article 'a' and
does this article 'a' have a chapter 'c2' which has a section
's' which has a figure 'f' which is called "Example semi-joins".
This is a binary yes/no type of query.
Given that $dblp is bound to the element DBLP, the following
expression should return what you are looking for, and is I think
self-explanatory:
exists(
$dblp
/Book[@rdf:about eq 'Book1']
/chapter
/Chapter[@rdf:about eq 'c1']
I think c1 was intended as a range variable rather than an actual
chapter name - though I can't be sure. Certainly it looks to me as if
"a" is intended as a range variable, since the join (books cites
article) seems to be the essence of this query. Florent's query doesn't
seem to include this join condition. I don't think I can correct it,
however, without a better formulation of the requirement.
Michael Kay
Saxonica
/section
/Section
/cites[@rdf:resource eq 'a']
/../../../../../..
/Article[@rdf:about eq 'a']
/chapter
/Chapter[@rdf:about eq 'c2']
/section
/Section[@rdf:about eq 's']
/figure[. eq '"Example Semi-join"']
)
Regards,
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