RE: doc() concat expression and whitespace error

You would get extra flexibility by issuing an "abstract query" from your
stylesheet and using a URIResolver to convert it to a concrete eXist query.

The "abstract query" might be a URI such as

http://query/?citekeys= + $citekeys

which you could parse in your URIResolver using the methods available on the
java.net.URI class.

Then all you would need to get the data from a different source would be a
different URIResolver.

Michael Kay
http://www.saxonica.com/ 

> -----Original Message-----
> From: Bruce D'Arcus [mailto:bdarcus@xxxxxxxxxxxxx] 
> Sent: 18 November 2004 22:44
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  doc() concat expression and whitespace error
> 
> On Nov 16, 2004, at 12:02 PM, Bruce D'Arcus wrote:
> 
> >> Can the former be made faster?
> >
> > The easiest way is instead of sending a single query for each 
> > distinct-value of the "citekey" key, I somehow send a query 
> that asks 
> > for all of them at once.
> >
> > I'm not quite sure who to do that, though.  I know that I 
> want a "for 
> > $key in $keys return mods:mods[ID='$key']" sort of 
> expression; I just 
> > don't know how to do that with the key.
> 
> OK, we got it working so the stylesheets grab the entire 
> collection of 
> bibliographic records at once (sort of a PITA with the url 
> escaping).  
> With a bug fixed in eXist, it seems to be much faster than 
> the earlier 
> approach.
> 
> Does anyone have any feedback on if there is a better, more flexible, 
> way to code this?  I'd like to make it easy for people to switch to 
> different storage options (flat files and other sorts of 
> url-queries in 
> particular), probably even with a parameter option.
> 
>    <xsl:template match="db:bibliography" mode="create-bibcollection">
>       <xsl:variable name="citekeys">
>         <xsl:text>(</xsl:text>
>         <xsl:for-each select="distinct-values(key('citekey', 'all'))">
>           <xsl:if test="position() &gt; 1">,%20</xsl:if>
>           <xsl:text>&apos;</xsl:text>
>           <xsl:value-of select="."/>
>           <xsl:text>&apos;</xsl:text>
>         </xsl:for-each>
>         <xsl:text>)</xsl:text>
>       </xsl:variable>
>    <!--+ 
> ==============================================================
>      | bibrecord variable identifies where to locate the bib 
> records; in
>      | this case, we access them via http from an eXist XML DB
>      +-->
>       <xsl:variable name="bibrecord"
>          
> select='doc(concat("http://localhost:8080/exist/servlet/db/biblio?",
>          
> "_query=declare%20namespace%20mods=%22http://www.loc.gov/mods/v3%22;",
>          "%20for%20$citekey%20in%20",
>          $citekeys,
>          
> "%20return%20/mods:modsCollection/mods:mods[@ID=$citekey]"))' />
>       <bibliography>
>         <modsCollection xmlns="http://www.loc.gov/mods/v3">
>            <xsl:copy-of select="$bibrecord/exist:result/mods:mods" />
>        </modsCollection>
>      </bibliography>
>    </xsl:template>
> 
> Bruce