`lab & v` allows matching the sub-tree `v` below the label `lab`, but not the attributes of the label `lab`'s node or edge. To refer to the label node/edge: `lab$p & v`, where `p` captures the attributes of the label node/edge.
lab & vallows matching the sub-treevbelow the labellab, but not the attributes of the labellab's node or edge.To refer to the label node/edge:
lab$p & v, wherepcaptures the attributes of the label node/edge.