Jython
We’ll start our tour of BSF-supported languages with Jython, an implementation of Python written in Java. As you would expect, we must do several things to identify our extension code to Xalan. We’ll cover them, and then look at the source of the extension functions. First we need to define the namespace prefixes we’ll use:
<!-- piechart-jython.xsl --> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:svg="http://www.w3.org/2000/svg" xmlns:months="http://www.oreilly.com/xslt/months" xmlns:lxslt="http://xml.apache.org/xslt" xmlns:jython-extension="http://www.jython.org" extension-element-prefixes="jython-extension" exclude-result-prefixes="lxslt">
We’re generating SVG markup, so we need to define the svg
namespace. The months
namespace is for the <months>
elements we use for a
document('')
lookup table (for
variety’s sake, we’ll avoid using the EXSLT extensions here). For the
last two namespaces, lxslt
is the
namespace Xalan uses to invoke the Bean Scripting Framework, and
jython-extension
is the prefix we
use to identify the extension functions written in Jython.
Tip
In this example, we associated the jython-extension
namespace prefix with the
URI http://www.jython.org
, which
is the home page for the Jython project. The URI could be anything.
The crucial identifier for the BSF is the name of the language, as
we’ll see in just a minute.
Our code goes in a <lxslt:component>
element:
<lxslt:component prefix="jython-extension" functions="cos ...
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