Set<Entry> set = new HashSet<Entry>();
BranchNode filter = new AndNode();
// ( objectClass = metaAttributeType )
BranchNode or = new OrNode();
or.addNode( new EqualityNode<String>( OBJECT_CLASS_AT,
new StringValue( MetaSchemaConstants.META_ATTRIBUTE_TYPE_OC.toLowerCase() ) ) );
or.addNode( new EqualityNode<String>( OBJECT_CLASS_AT,
new StringValue( MetaSchemaConstants.META_OBJECT_CLASS_OC.toLowerCase() ) ) );
filter.addNode( or );