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XQJ: html page screen scrap
Added by Anonymous about 13 years ago
Legacy ID: #9388554
Legacy Poster: Chris (chr1sbau)
I have been trying to use the XQJ api to screen scrap a html page that has been
loaded into dom via HTML tidy. The Query I am try to run is: { for $x in
//div[@id='ctl09_RacePanel'] return {$x} } When I
run the query it results in just empty , however if I change for
$x in .//div[@id='ctl09_RacePanel'] to for $x in //[@id='ctl09_RacePanel'] the query
returns the html between the tag which is what I want, but I
need to filter the results down futher but cannot as even
//[@id='ctl09_RacePanel']/div/h3 returns empty tags. I have checked my
orignal query using the xquisitor gui tool and it works, but just not when I try to
implement it using XQJ The XQJ code I am using is: Document doc = fetchPage(); //fetchs
and runs html tidy and returns W3C dom document SaxonXQDataSource ds = new
SaxonXQDataSource(config); XQConnection con = ds.getConnection(); XQItem item =
con.createItemFromNode(doc.getChildNodes().item(1), con.createNodeType());
XQPreparedExpression xpres = con.prepareExpression(queryabove);
xpres.bindItem(XQConstants.CONTEXT_ITEM, item); XQResultSequence seq =
xpres.executeQuery(); I'm new to xquery and XQJ so i'm not sure if the problem is with
my XQJ code or the xquery I'm trying to run.
Legacy ID: #9389790
Legacy Poster: Michael Kay (mhkay)
If you look more closely at your source XML you will almost certainly find that the
elements are in a namespace, probably http://www.w3.org/1999/xhtml. So if you want to
select elements from this namespace, you will need to start your query with
[code]declare default element namespace =
"http://www.w3.org/1999/xhtml";[/code] Unfortunately this will have the
side-effect of putting your output elements (run and race) in this namespace as well,
which is probably not what you want. The workaround is to bind a specific prefix
[code]declare namespace h = "http://www.w3.org/1999/xhtml"; [/code] then write
[code]for $x in //h:div[...] return ...[/code] This is a weakness in the design of the
XQuery language. Please note that this forum isn't really intended for general XQuery
coding help that's independent of the Saxon product. You should try the talk @
x-query.com mailing list, or stackoverflow.com.
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