1. A Match Made In (Ethereal) Heaven
CCEL & XML
A Match Made In
(Ethereal) Heaven

2. The CCEL The Christian Classics Ethereal Library
Online library of electronic texts

3. The CCEL The Christian Classics Ethereal Library
Online library of electronic texts
Different applications require different formats

4. The CCEL The Christian Classics Ethereal Library
Online library of electronic texts
Different applications require different formats
Which format is authoritative?

5. The CCEL The Christian Classics Ethereal Library
Online library of electronic texts
Different applications require different formats
Which format is authoritative?
ThML (Theological Markup Language)
XML application
Master version of most (someday all) texts on ccel.org

6. ThML Defined as an XML application several years ago
Perl scripts and other “hacks” used to transform ThML into HTML (and other formats) for presentation on site
Static transformation
Error prone
Difficult to maintain

7. ThML Defined as an XML application several years ago
Perl scripts and other “hacks” used to transform ThML into HTML (and other formats) for presentation on site
Static transformation
Error prone
Difficult to maintain
Isn’t there a better way?

8. XSLT XML Stylesheet Language Transformations
Stylesheets written in XML that “explain” to a piece of software called a “transformer” how to change an XML document into a different format (XML or other)
Example: Client-side transformations with Internet Explorer 6

9. XSLT on the CCEL Summer of 2001
Two students (myself and Jimmy Osborn) wrote XSLT stylesheets that duplicated the functionality of the Perl script transformations
From user’s perspective, the XSLT-transformed docs look no different from the Perl-transformed docs
From developer’s perspective, there is now only one file for every text in the library (the ThML file), all other formats are generated on-the-fly at the user’s request

10. XSLT on the CCEL Summer of 2001 How does this work?
Two students (myself and Jimmy Osborn) wrote XSLT stylesheets that duplicated the functionality of the Perl script transformations
From user’s perspective, the XSLT-transformed docs look no different from the Perl-transformed docs
From developer’s perspective, there is now only one file for every text in the library (the ThML file), all other formats are generated on-the-fly at the user’s request
How does this work?
Client-side transformations are not powerful enough for our purposes
We needed a more powerful, server-side transformer

11. Apache Cocoon Java webapp (webapps are servlets with an attitude)
Runs inside a Java servlet engine (e.g. Apache Tomcat), which is then connected to a web server
Not just a transformer, but an “XML Publishing Framework”
Brings together of host of different XML technologies for the purpose of publishing XML docs online
Does XSLT transformations, XSL-FO to PDF conversion, renders SVG graphics, executes eXtensible Server Pages (XSP), integrates with databases, washes your dog and more

12. Sitemap
The sitemap is where Cocoon really shows that it is more than just a kludge of XML-processing programs
Using regexp matching (or simple wildcard, if you’re into that sort of thing…), it maps URLs to an XML document, a stylesheet, and a transformer (and a few other things I won’t get into here)
Based on the URL, you can match any XML source doc with any XSLT stylesheet and then send the result through any transformer you like!

13. CCEL Sitemap

14. CCEL Sitemap
New Problem: People browsing online don’t want the whole text in one big HTML file
Cocoon’s sitemap helps us here too…

15. CCEL Sitemap
New Problem: People browsing online don’t want the whole text in one big HTML file
Cocoon’s sitemap helps us here too…

16. Current Status Still in “beta” stage
This new system still has a few bugs, but it will be going online in a preliminary form very soon

17. Current Status Still in “beta” stage
This new system still has a few bugs, but it will be going online in a preliminary form very soon
As more and more documents are converted to well-formed ThML, they can be used by Cocoon and we will hopefully phase out the old system over time
There are SO many documents on the CCEL, this may take some time

18. Current Status New Server
Our new Dell PowerEdge 2500 server runs Cocoon (being a Java app, its not the most efficient user of system resources)

19. Current Status New Server
Our new Dell PowerEdge 2500 server runs Cocoon (being a Java app, its not the most efficient user of system resources)
We are currently in the process of moving the entire site over to the PowerEdge
When this is complete, the new XML-based system will be available for people to try out

20. Current Status New Server
Our new Dell PowerEdge 2500 server runs Cocoon (being a Java app, its not the most efficient user of system resources)
We are currently in the process of moving the entire site over to the PowerEdge
When this is complete, the new XML-based system will be available for people to try out
Some examples from the new site…