Here are the data structures with brief descriptions:
  gfsmAlphabet | Generic alphabet structure |
| gfsmAlphabetSaveFileData | Datatype used for save_file() iteration |
| gfsmArc | "Heavy" arc structure |
| gfsmArcCompData | Data for new-style generic arc comparison |
| gfsmArcIter | Abstract type for arc iterators |
| gfsmArcLabel | Weighted pair of gfsmLabelId , used by gfsm_automaton_encode() |
| gfsmArcListNode_ | "Heavy" arc-list structure, no longer using GSList |
| gfsmArcPathToStringOptions_ | Utility struct for gfsm_arcpath_to_gstring() and friends |
| gfsmArcRange | Type for searching and iterating over arcs in a gfsmArcTable |
| gfsmArcTableIndex | Basic type for dedicated arc storage state-based arc index |
| gfsmArithParams | Type representing all parameters for a generic automaton arithmetic operation |
| gfsmAutomaton | "Heavy" automaton type |
| gfsmAutomatonFlags | Automaton status flags |
| gfsmAutomatonHeader | Header info for binary files |
| gfsmComposeState | Matched pair of (gfsmStateId)s with an additional filter state (used for transducer composition) |
| gfsmEnum | Structure for mapping symbolic names to numeric IDs |
| gfsmIdentityAlphabet | Sparse identity alphabet structure |
| gfsmIndexedAutomaton | Type for an indexed automaton |
| gfsmIndexedAutomatonHeader | Header info for binary files |
| gfsmIOHandle | Generic I/O handle struct |
| gfsmLookupConfig | Type for gfsm_automaton_lookup() computation state |
| gfsmPath | Type for an automaton path (labels only, no alignment) |
| gfsmPathsToStringsOptions_ | Utility struct for gfsm_paths_to_strings() |
| gfsmPointerAlphabet_ | Pointer-hashing alphabet structure |
| gfsmPosGString | GString with an associated index (read head) |
| gfsmRegexCompiler | Type for a regular expression compiler |
| gfsmSemiring | Struct to represent a builtin semi-ring for gfsm arc weights |
| gfsmState | Automaton state structure |
| gfsmStatePair | Matched pair of state-ids (used for automaton intersection) |
| gfsmStateWeightPair | Type for a (gfsmStateId,gfsmWeight) pair (used by algebraic operations) |
| gfsmStoredArc | Type for a stored arc (no 'source' field) |
| gfsmStoredState | Type for a stored state |
| gfsmTrainConfig_ | Low-level type for gfsm_automaton_train() computation state |
| gfsmTrainer | Top-level type for automaton training data and options |
| gfsmUserAlphabet_ | User-extendable alphabet structure |
| gfsmUserAlphabetMethods | Method table for user-defined alphabets |
| gfsmUserSemiring | User-defined semirings for gfsm operations |
| gfsmVersionInfo | Library Version information |
| gfsmWeightHash | Structure for mapping arbitrary data to gfsmWeights with a hash. really just an ugly wrapper for GHashTable |
| gfsmWeightOrPointer | Union type for converting between gfsmWeight and gpointer. Requires that sizeof(gpointer)>=sizeof(gfsmWeight) in order to work properly |
| yy_buffer_state | Flex-generated lexer input buffer state struct |
 YYSTYPE | Bison-generated parser rule-value union |
