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Filter settings are stored as an XML file with a certain structure.

The configuration file begins with the standard XML document starting tag which specifies XML version 1.0 and document encoding.

For example:

<?xml version="1.0" encoding="utf-8"?>

The filter root tag follows with the filter settings. The root tag has the following attributes: name - short name of the filter, and version - filter version. The only version currently supported is "1.0".

For example:

<?xml version="1.0" encoding="utf-8"?>
<filter name="main filter" version="1.0">
   ...
</filter>

You can add an optional comment for the filter (it may be a text description of the filter's purpose). Comments may contain any text and they are ignored when the filter is applied. A comment is added as a separate <comment> tag.

For example:

<?xml version="1.0" encoding="utf-8"?>
<filter name="main filter" version="1.0">
   <comment>This is a comment.</comment>
   ...
</filter>

Similarly, you can specify comments for tables and rules.