perrin at apache
Feb 3, 2008, 8:03 PM
Post #1 of 1
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svn commit: r618166 - /perl/modperl/docs/trunk/src/docs/tutorials/tmpl/comparison/comparison.pod
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Author: perrin
Date: Sun Feb 3 20:03:42 2008
New Revision: 618166
URL: http://svn.apache.org/viewvc?rev=618166&view=rev
Log:
Remove AxKit and add AxKit2, remove useless matrix at bottom of document
Modified:
perl/modperl/docs/trunk/src/docs/tutorials/tmpl/comparison/comparison.pod
Modified: perl/modperl/docs/trunk/src/docs/tutorials/tmpl/comparison/comparison.pod
URL: http://svn.apache.org/viewvc/perl/modperl/docs/trunk/src/docs/tutorials/tmpl/comparison/comparison.pod?rev=618166&r1=618165&r2=618166&view=diff
==============================================================================
--- perl/modperl/docs/trunk/src/docs/tutorials/tmpl/comparison/comparison.pod (original)
+++ perl/modperl/docs/trunk/src/docs/tutorials/tmpl/comparison/comparison.pod Sun Feb 3 20:03:42 2008
@@ -142,11 +142,11 @@
using object calls or in-line Perl. This would be using it in a
callback style.
-HTML::Template and some of the AxKit XML processors are fairly rigid
-about insisting on a pipeline approach. Neither provide methods for
+HTML::Template is fairly rigid
+about insisting on a pipeline approach. It doesn't provide methods for
calling back into Perl code during the HTML formatting stage; you have
-to do the work before running the template. The authors of these
-tools consider this a feature since it prevents developers from
+to do the work before running the template. The author of the
+module consider this a feature since it prevents developers from
cheating on the separation of application code and presentation.
=head2 Languages
@@ -164,8 +164,7 @@
addition to) in-line Perl. These will typically have just enough
syntax to handle variable substitution, conditionals, and looping.
HTML::Template and Template Toolkit are popular systems using this
-approach. AxKit straddles the fence, providing both a (not-so-)
-mini-language - XSLT - and an in-line Perl approach - XPathScript.
+approach.
Here's how a typical discussion of the merits of these approaches might go:
@@ -331,11 +330,9 @@
=head3 Output Caching
-Caching is the key to good performance in many web systems, and some
-of these tools provide user-controlled caching of output. This is one
-of the major features of both Mason and AxKit. AxKit can cache at the
-page level, while Mason also offers fine-grained caching of components
-within the page.
+While caching of output is outside the scope of most templating systems, Mason
+includes it as a standard feature. In addition to page-level caching, Mason also
+offers fine-grained caching of output from sections within a page.
=head3 Form Handling
@@ -535,72 +532,6 @@
supports direct use of the Perl debugger on Embperl templates, and
provides performance improvements.
-=head2 Apache::AxKit
-
-AxKit is the first mod_perl page generation system to be built from the
-ground up around XML. Technically, AxKit itself is not a templating
-tool but rather a framework for stringing together different modules
-that generate and transform XML data. In fact, it can optionally use
-Template Toolkit as an XML transformation language. However, it
-deserves coverage here since it is also the home of some templating
-tools that are not represented elsewhere.
-
-In its simplest form, AxKit maps XML files to XSL stylesheets which it
-can process using commonly available XSLT modules like XML::XSLT or
-XML::Sablotron. The rules for mapping a stylesheet to a request are
-very flexible, and they can incorporate query strings, cookies, and
-other attributes of the request. The idea is that you can use this
-feature to handle a wide variety of clients with differing display
-capabilities by choosing the right stylesheet.
-
-Recognizing that not everyone is a fan of XSL's somewhat obtuse
-syntax, Matt Sergeant has provided an alternate stylesheet language
-called XPathScript. XPathScript allows you to write a stylesheet
-using text with embedded Perl code. This is similar to the other
-embedded Perl templating tools, but the focus is on using the built in
-XPath functions for querying an XML document and manipulating the
-retrieved data. XPathScript can also be used in a declarative
-fashion, specifying the formatting of particular elements in the XML
-input. For example this snippet will change all C<E<lt>fooE<gt>> tags
-in an XML document to BAR in the output::
-
- <%
- $t->{'foo'}{pre} = 'BAR';
- $t->{'foo'}{post} = '';
- $t->{'foo'}{showtag} = 0;
- %>
- <%= apply_templates() %>
-
-By using XPathScript's include function (which looks just like SSI),
-you can build up libraries of useful transformations that use this
-technique.
-
-This is all well and good if you have a bunch of XML files sitting on
-a disk somewhere, but what about dynamic content? AxKit handles this
-by allowing you to substitute a different data source for the default
-file-based one. This can include running some dynamic code on each
-request to generate the XML data that will be transformed. The
-distribution includes a module for doing this called XSP. XSP is a
-language for building an XML DOM using in-line Perl and tag libraries.
-The tag libraries are specified as stylesheets which can turn XML tags
-into Perl code. This is demonstrated through the included SQL tag
-library, which allows you to write an XSP page using XML tags which
-will connect to a database, execute queries, and generate an XML
-document with the results.
-
-AxKit has some nice performance boosts built into it. It can cache
-the full output of a page and serve it as a static file on future
-requests. It can also compress output to speed up downloads for
-browsers that understand gzip encoding. These can be done with other
-systems, but they require you to setup additional software . With
-AxKit, you just enable them in the configuration file.
-
-If all of these languages, tag libraries, and stylesheets sound
-intimidating to you, AxKit may be overkill for your project. However,
-AxKit has the advantage of being built on approved W3C standards, and
-many of the skills used in developing for it carry over to other
-languages and tools.
-
=head2 Apache::ASP
Apache::ASP started out as a port of Microsoft's Active Server Pages
@@ -804,6 +735,23 @@
And now, a few honorable mentions:
+=head2 AxKit2
+
+Previous versions of this document covered Apache::AxKit. However, the coverage
+was not very good and that project has since been replaced by AxKit2.
+
+Like its predecessor, AxKit2 is all about XML. It is more of a framework than a
+templating system per se, but includes support for multiple templating systems
+within it. The systems supported in the core release include XSLT, TAL (see
+the notes on Petal and Template::TAL below), XSP, an XML-based mini-language
+which can be extended with your own tags, and facilities for writing custom tag
+libraries.
+
+Rather than short-change AxKit2 here with an inadequate description, I would
+encourage people who are intrigued by what they've heard so far to go and check
+out AxKit2 on CPAN. If you like working with XML, this may be a very good fit
+for you.
+
=head2 HTML_Tree
As mentioned earlier, HTML Tree uses a fairly unique method of
@@ -933,180 +881,6 @@
simple regex parsing and doesn't need to eval any in-line Perl code.
Almost everything else mentioned here will add tenths of seconds to
each page in compilation time alone.
-
-=head1 Matrix
-
-To help you choose a system, I'll summarize the basic characteristics
-of the major systems along the decision points I've explained in the
-beginning of the article. Keep in mind that in many cases a system
-can be used in more than one way, and I've simply shown the dominant
-method as seen in the documentation and real world use. You should
-not eliminate options based on this chart without reading the more
-detailed explanations above.
-
-=for html
- <table border="0" cellpadding="1" cellspacing="1">
- <tr>
- <th class="table-title-bg"><br></th>
- <th class="table-title-bg">
- <div class="table-title">
- Application Framework
- </div>
- </th>
- <th class="table-title-bg">
- <div class="table-title">
- Pipeline or Callback
- </div>
- </th>
- <th class="table-title-bg">
- <div class="table-title">
- Parsing Method
- </div>
- </th>
- <th class="table-title-bg">
- <div class="table-title">
- Language
- </div>
- </th>
- </tr>
- <tr>
- <td class="table-bg">
- HTML::Mason
- </td>
- <td class="table-bg">
- Framework
- </td>
- <td class="table-bg">
- Callback
- </td>
- <td class="table-bg">
- Compiled
- </td>
- <td class="table-bg">
- Perl
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- Template Toolkit
- </td>
- <td class="table-bg">
- Just Templates
- </td>
- <td class="table-bg">
- Pipeline
- </td>
- <td class="table-bg">
- Compiled
- </td>
- <td class="table-bg">
- Mini-Language
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- Apache::ASP
- </td>
- <td class="table-bg">
- Framework
- </td>
- <td class="table-bg">
- Callback
- </td>
- <td class="table-bg">
- Compiled
- </td>
- <td class="table-bg">
- Perl and XSL
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- HTML::Embperl
- </td>
- <td class="table-bg">
- Framework
- </td>
- <td class="table-bg">
- Callback
- </td>
- <td class="table-bg">
- Compiled
- </td>
- <td class="table-bg">
- Perl
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- SSI
- </td>
- <td class="table-bg">
- Just Templates
- </td>
- <td class="table-bg">
- Callback
- </td>
- <td class="table-bg">
- Repeated Parse
- </td>
- <td class="table-bg">
- Mini-Language
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- AxKit
- </td>
- <td class="table-bg">
- Framework
- </td>
- <td class="table-bg">
- Pipeline
- </td>
- <td class="table-bg">
- Compiled or Cached Parse Tree
- </td>
- <td class="table-bg">
- Perl and XSL and Mini-Language(s)
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- HTML::Template
- </td>
- <td class="table-bg">
- Just Templates
- </td>
- <td class="table-bg">
- Pipeline
- </td>
- <td class="table-bg">
- Cached Parse Tree
- </td>
- <td class="table-bg">
- Mini-Language
- </td>
- </tr>
- <tr>
- <td class="table-bg">
- Text::Template
- </td>
- <td class="table-bg">
- Just Templates
- </td>
- <td class="table-bg">
- Pipeline
- </td>
- <td class="table-bg">
- Compiled
- </td>
- <td class="table-bg">
- Perl
- </td>
- </tr>
- </table>
-
=head1 Updates
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