provides a filtered version of a configuration data Layer.
A layer filter wraps a source XLayer object and
provides access to a filtered version of its data.
The data read from the filter usually is produced from the source data
by adding and removing elements or modifying values.
provides a means to set the source data for the filter.
Call XInitialization::initialize()
with a single argument of type ::com::sun::star::beans::NamedValue,
where ::com::sun::star::beans::NamedValue::Name is "Source"
and ::com::sun::star::beans::NamedValue::Value
is an object implementing XLayer.