code: public boolean exactMatch(Descriptor descriptor) {
  		return exactMatchField(_group, descriptor.getGroup()) && exactMatchField(_type, descriptor.getType())
  				&& exactMatchField(_kind, descriptor.getKind()) && exactMatchField(_name, descriptor.getName())
  				&& exactMatchField(_version, descriptor.getVersion());
  	}
docs: Matches this descriptor to another descriptor by all fields. No exceptions
  are made.
  
  @param descriptor the descriptor to match this one against.
  @return true if descriptors match and false otherwise.
  
  @see #match(Descriptor)