INTERNAL: Object to hold onto a fetch attribute metadata from a named fetch group metadata. Key notes: - any metadata mapped from XML to this class must be compared in the equals method. - when loading from annotations, the constructor accepts the metadata accessor this metadata was loaded from. Used it to look up any 'companion' annotation needed for processing. - methods should be preserved in alphabetical order.
@author Guy Pelletier
@since EclipseLink 2.1
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