The purpose of this mapping is to define a heterogeneous set of fields that belong to some modules. Simply a bunch of fields. This could be used to define a set of fields to launch a mass operation upon or a set of fields which must be excluded/included from some global process.
The accepted format is:
<map>
<module>
<name>ModuleName</name>
<fields>
<field>
<name>fieldname</name>
<info>anything you need</info>
</field>
.....
</fields>
</module>
....
</map>
You will be able to get the set of fields using the getFieldSet() method, and the fields on one module with the getFieldSetModule($module) method.
Next | Chapter 10: Master Detail Mapping.