[xsl] Combining XML XBEL files

["Aaron Gray" <aaronngray.lists@xxxxxxxxxxxxxx>]

I want to combine two XML Bookmark Exchange Language files into one.

       http://pyxml.sourceforge.net/topics/xbel/

basically they are hierarchical XML files with folder, bookmark and title 
elements.

They need sorting alphabetically and combining.

I have basic XSLT knowledge and have written a XBEL to HTML converter in XSL 
which gives a contents list of folders with links to the full hierarchical 
list of bookmarks, but am stumped by combining two XBEL files.

If you could either give an example of a simular problems solution or a 
basic guideline or structure of how to go about this.

Theres an example xbel file below.

Many thanks in advance,

Aaron

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE xbel PUBLIC "+//IDN python.org//DTD XML Bookmark Exchange Language 
1.0//EN//XML" "http://www.python.org/topics/xml/dtds/xbel-1.0.dtd";>
<xbel>
<folder>
<title>Astrophysics</title>
<bookmark 
href="http://space.newscientist.com/article/mg19626303.500-deflected-asteroids-may-keep-coming-back.html?feedId=online-news_rss20";>
<title>Deflected asteroids may keep coming back - space - 17 November 2007 - 
New Scientist Space</title>
</bookmark>
<bookmark 
href="http://space.newscientist.com/article.ns?id=dn12665&amp;feedId=online-news_rss20";>
<title>Did the big bang spawn trillions of black holes - space - 19 
September 2007 - New Scientist Space</title>
</bookmark>
</folder>
<folder>
<title>Brain</title>
<bookmark 
href="http://technology.newscientist.com/channel/tech/dn13491-blue-leds-to-reset-tired-truckers-body-clocks.html?feedId=online-news_rss20";>
<title>Blue LEDs to reset tired truckers&apos; body clocks - tech - 18 March 
2008 - New Scientist Tech</title>
</bookmark>
<bookmark 
href="http://www.newscientist.com/channel/health/dn13458-brain-map-project-set-to-revolutionise-neuroscience.html?feedId=online-news_rss20";>
<title>Brain map project set to revolutionise neuroscience - health - 13 
March 2008 - New Scientist</title>
</bookmark>
<bookmark 
href="http://technology.newscientist.com/channel/tech/dn12991-invention-schizophrenia-spotter.html?feedId=online-news_rss20";>
<title>invention Schizophrenia spotter - tech - 03 December 2007 - New 
Scientist Tech</title>
</bookmark>
<bookmark href="http://www.newscientist.com/channel/health/brain";>
<title>Special Report on The Human Brain - New Scientist</title>
</bookmark>
<bookmark 
href="http://www.sciam.com/article.cfm?chanID=sa003&amp;articleID=26362807-E7F2-99DF-3071E2B871080EB8&amp;ref=rss";>
<title>The Birth of a Brain Cell Scientists Witness Neurogenesis Scientific 
American</title>
</bookmark>
<bookmark 
href="http://science-community.sciam.com/blog-entry/Mind-Matters/Reading-Brain/5800000217";>
<title>The Reading Brain Blogs Scientific American Community</title>
</bookmark>
</folder>
<folder>
<title>XSLT</title>
<bookmark 
href="http://www.microsoft.com/downloads/details.aspx?FamilyId=2FB55371-C94E-4373-B0E9-DB4816552E41&amp;displaylang=en#filelist";>
<title>Download details Command Line Transformation Utility 
(msxsl.exe)</title>
</bookmark>
<bookmark href="http://msdn2.microsoft.com/en-us/library/ms950776.aspx";>
<title>exslt Enhancing the Power of XSLT</title>
</bookmark>
<bookmark href="http://mvp-xml.sourceforge.net/exslt/";>
<title>Mvp.Xml project EXSLT.NET module</title>
</bookmark>
<bookmark href="http://www.xmlplease.com/xhtmlxhtml#footnote-1";>
<title>Transform XHTML to XHTML with XSLT</title>
</bookmark>
<bookmark href="http://www.w3.org/TR/xslt";>
<title>XSL Transformations (XSLT)</title>
</bookmark>
<bookmark href="http://www.xmlplease.com/xhtml";>
<title>XSLT for XHTML</title>
</bookmark>
</folder>
<bookmark href="https://www.bethere.co.uk/";>
<title>Be 24 meg broadband, the UK&apos;s fastest broadband ISP</title>
</bookmark>
<bookmark href="http://www.chomsky.info/index.htm";>
<title>chomsky.info  The Noam Chomsky Website</title>
</bookmark>
<bookmark 
href="http://java.sun.com/docs/books/jls/download/langspec-3.0.pdf";>
<title>http--java.sun.com-docs-books-jls-download-langspec-3.0.pdf</title>
</bookmark>
<bookmark 
href="http://support.thetechguys.com/Layout.aspx?ID={37851ef7-2cd7-4464-9daa-732da20d94c6}&amp;CatID={c7c9a717-9744-4545-bc0f-6cb07c02a705}";>
<title>The TechGuys  Welcome to The TechGuys</title>
</bookmark>
<bookmark href="http://www.research.att.com/sw/tools/uwin/";>
<title>UWIN</title>
</bookmark>
</xbel>