Identify, count, and match recurring substructures in glycan structures. Supports concrete and generic monosaccharide matching, several structural alignment modes, node-to-node mappings, and batch analysis using subgraph isomorphism. Includes curated motif annotations derived from the 'GlycoMotif' resource < https://glycomotif.glyomics.org/>. Integrates with 'glyrepr' and 'glyparse' for structural glycomics workflows.