attribute_filter ..

fetch( 'content', 'list',
hash( parent_node_id, $node.node_id, attribute_filter,
array( 'or', array( 152, '=', 'abc' ),
array( 153, '=', '42' ) ) ) )

this query mean :
where 152='abc' or 153=42
??!
also can we use 'and' ?