jpx_metanode::get_label

Returns non-NULL if and only if get_box_type returns jp2_label_4cc — i.e., the lbl box type code. The body of all label boxes is stored explicitly by the internal machinery and the null-terminated text string is returned here.

Both intermediate and leaf nodes may be represented by labels. If an intermediate node is represented by a label, all of the node's descendants are semantically associated with the label.