A descriptor describing the schema to validate the components {@link org.apache.avalon.framework.parameters.Parameters} or {@link org.apache.avalon.framework.configuration.Configuration} object. If acomponent is neither {@link org.apache.avalon.framework.parameters.Parameterizable}nor {@link org.apache.avalon.framework.configuration.Configurable} then thisdescriptor will hold empty values for location, category and type.
Associated with each Schema is a set of arbitrary Attributes that can be used to store extra information about Schema requirements.
@author Peter Donald
@version $Revision: 1.2 $ $Date: 2004/05/01 12:48:34 $