inline node_t tagged_next(node_t, tag_t) const;
inline node_t tagged_descendant(node_t, tag_t) const;
inline node_t tagged_following_before(node_t, tag_t, node_t) const;
inline node_t tagged_child(node_t, tag_t) const;
inline node_t tagged_sibling(node_t, tag_t) const;
node_t select_child(node_t, tag_t*) const;
inline node_t tagged_next(node_t, tag_t) const;
inline node_t tagged_descendant(node_t, tag_t) const;
inline node_t tagged_following_before(node_t, tag_t, node_t) const;
inline node_t tagged_child(node_t, tag_t) const;
inline node_t tagged_sibling(node_t, tag_t) const;
node_t select_child(node_t, tag_t*) const;