0.3
Jelly <tag>set</tag> and <tag>out</tag> Examples
Introduction
In Jelly a lot of possible. The functionality used most by the user is
the use of variables. It is possible to use variables as text, where XML
is not interpreted, but it is also possible to interpret the XML and even
to select only a part of the XML with an XPath expression.
More information about Jelly can be found in .
Note that the Jelly expression $${..}
will be executed
even from a CDATA tag or a <!-- --> comment
section. The way to escape it is to use an extra dollar as in
$$$${..}
.
Some variables are automatically set and allow access to various
information. It is possible to overwrite these locally, but this is not
recommended. The variables are:
$formdata
For a submitted form this consists of a tag variables,
containing the submitted form data.
$instance
This contains internal information and should not be needed.
First an example will be given with text and then another with XML code.
Note that the namespaces used are xmlns:c='jelly:core' and
xmlns:x='jelly:xml'.
Some Examples
An example with text set and read using <code>jelly:core</code>.
0.3
The version is or $${version}.
]]>
This is an example where the text 0.3
is put in a
variable named version. The trim
attribute eith value true indicates that any whitespace at the
beginning or the end should be removed. The result is displayed
below:
The version is or ${version}.
An example with XML set and read using <code>jelly:xml</code>.
2
1
The formula is . The part of the
formula right of the equals
-sign is
.
]]>
This is an example where an Openmath function definition is put in a
variable called formula. With x:copyOf it
is possible to select the whole object or to select a part of it. The
output is displayed below.
2
1
The formula is . The part of the
formula right of the equals
-sign is
.
More information
The main Jelly page is the Apache Jelly page.
On that sit is also more about the jelly:core
tags (c:-tags), more about the other
tags (one of which is xml)
and more about JEXL, the
Java Expression Language.