BranchNode or = new OrNode();
or.addNode( new EqualityNode<String>( OBJECTCLASS_OID,
new ClientStringValue( MetaSchemaConstants.META_ATTRIBUTE_TYPE_OC.toLowerCase() ) ) );
or.addNode( new EqualityNode<String>( OBJECTCLASS_OID,
new ClientStringValue( MetaSchemaConstants.META_OBJECT_CLASS_OC.toLowerCase() ) ) );
filter.addNode( or );
or = new OrNode();
or.addNode( new EqualityNode<String>( M_MAY_OID, new ClientStringValue( at.getOid() ) ) );
or.addNode( new EqualityNode<String>( M_MUST_OID, new ClientStringValue( at.getOid() ) ) );
or.addNode( new EqualityNode<String>( M_SUP_ATTRIBUTE_TYPE_OID, new ClientStringValue( at.getOid() ) ) );