Hello All,
The following sample XML document is generated from an RDF graph:
<DBLP>
<Book rdf:about="Book1">
<chapter>
<Chapter rdf:about="Introduction">
<section>
<Section rdf:about="Section1">
<cites rdf:resource="Article2"/>
<figure>"Example RDF graph"</figure>
</Section>
</section>
</Chapter>
</chapter>
</Book>
<Article rdf:about="Article2">
<chapter>
<Chapter rdf:about="Proof">
<section>
<Section rdf:about="Semi-joins">
<cites rdf:resource="Book3"/>
<figure>"Example Semi-join"</figure>
</Section>
</section>
</Chapter>
</chapter>
</Article>
</DBLP>
I am trying to understand if a path query on an RDF graph can be
represented as an XPath query over the corresponding XML structure.
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.
'c1', 'c2', 'a', 's' and 'f' are introduced for the sake of explaining
the query. In the XML above, c1=Introduction, a="Article 2",
c2="Proof", s="Semi-Joins".
Since I am new to XPath, I am finding it hard to express this query.I
am not even sure if this can be expressed in XPath.
I have just broken down a single query to explain my line of thinking.
This is how far I could come:
If X = //*[@rdf:about='Book1']//Chapter//cites@ref:resource ---- I
expect this to give me all the ref:resource attribute nodes?
//Article[@ref:about==X]//Chapter//Section//figure[text() == "Example
semi-joins"] ---- Can I match the attribute nodes above with the
ref:about attribute in Article?
Any ideas how I could do this?
Thanks in anticipation,
Vineet
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