The pointer may land on a node reference, a string holding an hm:// or ipfs:// URL, a list of either, or a block tree; the handler scans the value found there for references of all three shapes. For changes kinds the state is the document, so /content reaches every block and /metadata/icon reaches one attribute. Rules never produce dep, parent or proof links; those come from fixed fields. A rule whose path does not exist in a given state produces nothing.

The scanning of blocks and annotations for hm:// and ipfs:// URLs is hard-coded per blob type in the indexer. Rules make it declarative.