Rust API index

Every stable name Rust exports, and its extension seams.

Package: earthsci-ast 0.6.0

Documentation extracted with rustdoc JSON (rustdoc 1.101.0-nightly (21b707e3f 2026-09-30)), format_version 61.

Capability profiles: core, classification, simulation, runtime I/O.

Extension-tier names are on the Rust extension page .

Stable names

Rust	Canonical	Kind	Summary
`add_coupling`	`add_coupling`	function	Add a coupling entry to an ESM file
`add_equation`	`add_equation`	function	Add an equation to a model
`add_reaction`	`add_reaction`	function	Add a reaction to a reaction system
`add_species`	`add_species`	function	Add a species to a reaction system
`add_variable`	`add_variable`	function	Add a variable to a model
`AffectEquation`	`affect_equation`	type	Equation that modifies state/parameters when event fires
`algebraic_unknowns`	`algebraic_unknowns`	function	Unknowns constrained only implicitly (`HHSO4 ~ Ksp`).
`apply_dae_contract`	`apply_dae_contract`	function	Run the RFC §12 DAE binding contract on `esm` in place and return the classification summary.
`apply_scope_injections`	`apply_scope_injections`	function	esm-spec §9.7.10 forms A + B: fold any scope-directed injection — a subsystem-ref edge’s `injected` import list (form A) or a coupling entry’s injection map (form B) — into the…
`area_tolerance_ok`	`area_tolerance_ok`	function	The combined relative + absolute area-agreement gate with a sliver floor (B.5 / CONFORMANCE_SPEC.md §5.8.2):
`AssertionResult`	`assertion_result`	type	Outcome of one §6.6.5 inline-test assertion evaluated through the simulation pathway.
`brownian_parameters`	`brownian_parameters`	function	Parameters whose `update.kind` is `wiener` — the SDE noise sources.
`build_reference_graph`	`build_reference_graph`	function	Resolve the reference edges of one `model` value into a graph, against the
`build_reference_graph_with_index_sets`	`build_reference_graph`	function	Deprecated alias of `build_reference_graph`.
`build_unit_env`	`build_unit_env`	function	Build a `HashMap<String, Unit>` environment from model variable metadata, together with a list of warnings for any variables whose declared unit string could not be parsed.
`Cadence`	`cadence`	type	The cadence lattice (`CONFORMANCE_SPEC.md` §5.7.1): `const ⊏ discrete ⊏ continuous`.
`CadenceError`	`cadence_error`	error	A cadence-partition contract violation in a fixture or producer output (a wrong `expect_cadence`, a `CONTINUOUS` relational node, a `from_faq` cycle, a float topology key, or a…
`callbacks`	`callbacks`	function	The callbacks declared on `prob` (§2.5.4).
`CallbackSet`	`callback_set`	type	The callbacks declared on a `EsmProblem`.
`can_migrate`	`can_migrate`	function	Whether `migrate` would succeed for this version pair — i.e. whether `to_version` is among supported_migration_targets``(from_version).
`canonical_index_set_json`	`canonical_index_set_json`	function	Canonical byte form of an index set (`CONFORMANCE_SPEC.md` §5.5.3): the `distinct` rows, each tuple serialised as a JSON array, in §5.5.1 sorted order, as compact JSON (`,` /…
`canonical_json`	`canonical_json`	function	Emit the canonical on-wire JSON form of an expression (§5.4.6).
`canonicalize`	`canonicalize`	function	Canonicalize an `Expr` tree per RFC §5.4.
`CanonicalizeError`	`canonicalize_error`	error	Errors raised during canonicalization (per RFC §5.4.6 / §5.4.7).
`closed_function_names`	`closed_function_names`	function	The closed function set.
`ClosedFunctionError`	`closed_function_error`	error	Error type for closed-function dispatch failures (esm-spec §9.1–§9.2).
`Compiler`	`compiler`	type	Which strategy builds a Problem’s right-hand side (API_SPEC §5.8, esm-libraries-spec §2.5.10).
`CompilerReport`	`compiler_report`	type	What built a Problem’s right-hand side, per rule (API_SPEC §5.8).
`component_exists`	`component_exists`	function	Check if a component exists in the ESM file
`component_graph`	`component_graph`	function	Build a component graph from an ESM file
`ComponentGraph`	`component_graph`	type	Component graph representing model structure
`ComponentNode`	`component_node`	type	Node in the component graph
`compose`	`compose`	function	Concatenate two callback sets into a new one.
`constant_parameters`	`constant_parameters`	function	Parameters with neither a distribution nor an update — plain constants.
`contains`	`contains`	function	Check if an expression contains a specific variable
`ContinuousEvent`	`continuous_event`	type	Continuous event that fires on zero-crossings
`Contribution`	`contribution`	type	One summand of a flattened equation’s right-hand side, with its authors (esm-libraries-spec §4.7.5, “Per-term provenance”).
`convert_units`	`convert_units`	function	Convert between compatible units
`Coordinate`	`coordinate`	type	One entry of the document-scoped `EsmFile::coordinates` registry (RFC streaming-output-sinks §8.3): marks an existing data array — or an inline literal vector — as a physical…
`CouplingEdge`	`coupling_edge`	type	Edge in the component graph
`CouplingEntry`	`coupling_entry`	type	Coupling entry with discriminated union based on type field
`CouplingImportOptions`	`coupling_import_options`	type	Options controlling how `coupling_import` refs are resolved at flatten.
`CouplingRole`	`coupling_role`	type	A coupling-library formal component role (esm-spec §10.9).
`DaeInfo`	`dae_info`	type	Summary of DAE classification stamped onto `metadata.dae_info` by `discretize()` per RFC §12.
`DataSource`	`data_source`	type	Generic, runtime-agnostic description of an external data source (esm-spec §8).
`DataSourceBinding`	`data_source_binding`	type	Binds a parameter to ONE variable of a `data_sources` entry (esm-spec §8.5).
`DataSourceDeterminism`	`data_source_determinism`	type	Reproducibility contract a loader advertises to bindings (esm-spec §8.9.2).
`DataSourceKind`	`data_source_kind`	type	Structural kind of a data loader dataset.
`DataSourceLocation`	`data_source_location`	type	File discovery configuration.
`DataSourceTemporal`	`data_source_temporal`	type	Temporal coverage and record layout for a data source.
`Decomposition`	`decomposition`	type	The horizontal decomposition a tile cuts (RFC U3 §1): the decomposed index sets and the face sets that stagger off them, `(face set, cell set)`.
`DEFAULT_ABSTOL`	`default_abstol`	constant	The canonical default absolute tolerance — Julia’s.
`DEFAULT_RELTOL`	`default_reltol`	constant	The canonical default relative tolerance.
`DependencyEdge`	`dependency_edge`	type	Edge representing dependencies between variables in an expression graph
`derive_odes`	`derive_odes`	function	Generate ODE model from a reaction system
`derive_output_gridding`	`derive_output_gridding`	function	Invert the flat state-element names into one `VarGridding` per output base-variable (RFC §7), the flat index of a name being its position in `slot_names` — the shape…
`derive_output_meta`	`derive_output_meta`	function	Distill a run document into `OutputMeta` — the Rust mirror of Julia’s `derive_output_meta`.
`derive_output_plan`	`derive_output_plan`	function	Derive the whole output plan for a run.
`desugar_pushdown`	`desugar_pushdown`	function	Recognise the projection-pushdown pattern in `esm`’s named model and, when it matches, return a NEW document (`Cow::Owned`) with the four constructs desugared in (a…
`Dimension`	`dimension`	type	Base physical dimensions — the eight canonical axes shared across the bindings (`m kg s mol K A cd rad`).
`discrete_parameters`	`discrete_parameters`	function	Parameters carrying any OTHER update — piecewise-constant between refreshes.
`DiscreteEvent`	`discrete_event`	type	Discrete event that can modify the system
`DiscreteEventTrigger`	`discrete_event_trigger`	type	Trigger condition for discrete events
`distinct`	`distinct`	function	Set semantics over `rows`: sort by the §5.5.1 total order, then drop
`Distribution`	`distribution`	type	A parameter’s value drawn from a probability distribution rather than fixed (esm-spec §6.3, schema `Distribution`).
`Domain`	`domain`	type	Spatial/temporal domain specification
`EdgeKind`	`edge_kind`	type	The three kinds of reference edge (RFC §6.1 “Propagation”).
`EditError`	`edit_error`	error	Errors that can occur during editing operations
`EnsembleProblem`	`ensemble_problem`	type	A EsmProblem plus a per-trajectory rewrite, and the family it stands for (§2.5.8) — the canonical form for parameter sweeps, Monte Carlo over declared distributions, and…
`EnumLoweringError`	`enum_lowering_error`	error	Stable diagnostic codes raised by the enum-lowering pass.
`ephemeral_injected_file`	`ephemeral_injected_file`	function	esm-spec §9.7.10 form C: build a throwaway `EsmFile` in which component `model_name` has the test’s `imports` (raw §9.7.2 entries) appended to its own…
`Equation`	`equation`	type	Differential equation
`error_code_names`	`error_code_names`	function	Every diagnostic code string in `ERROR_CODES`, sorted.
`ERROR_CODES`	`error_codes`	constant	The `codes` registry in ENUMERABLE form: `(constant name, code string)` for every diagnostic code this binding emits, in declaration order (grouped by the pass that emits it, as…
`esm_problem`	`esm_problem`	function	Build a `EsmProblem` (§2.5.2).
`EsmFile`	`esm_file`	type	Top-level ESM file structure
`EsmProblem`	`esm_problem`	type	A simulation problem: a document, an interval, and the bindings that fix the document rather than the run.
`evaluate`	`evaluate`	function	Evaluate a scalar AST expression against a map of float variable bindings.
`evaluate_cellwise`	`evaluate_cellwise`	function	Evaluate an array-valued expression (elementwise ops over array-producing `faq`/`makearray` nodes — e.g. a grid-geometry template expanded by a §9.7 import, or a §6.6.5 analytic…
`evaluate_closed_function`	`evaluate_closed_function`	function	Dispatch a closed function call.
`ExactScale`	`exact_scale`	type	The EXACT scale of a unit relative to SI (esm-spec §4.8.1 “Scales are EXACT”).
`expand_coupling_imports`	`expand_coupling_imports`	function	Expand every `coupling_import` entry in `file.coupling` into concrete edges, splicing them in the position of the import entry (esm-spec §10.10.3).
`Expr`	`expr`	type	Mathematical expression: a number literal, variable reference, or operator node.
`expression_graph`	`expression_graph`	function	Build an expression graph from various ESM components
`ExpressionGraph`	`expression_graph`	type	Expression graph representing variable dependencies within expressions
`ExpressionGraphOptions`	`expression_graph_options`	type	Settings for `expression_graph_with_options`.
`ExpressionParseError`	`expression_parse_error`	error	Returned when an expression string cannot be parsed.
`field_reduce`	`field_reduce`	function	Collapse a spatial field to the scalar a §6.6.5 `reduce` assertion compares (esm-spec §6.6.5); semantics identical to the Julia / Python references:
`flatten`	`flatten`	function	Flatten a coupled `EsmFile` into a single unified `FlattenedSystem`.
`flatten_with_options`	`flatten_with_options`	function	Flatten with explicit `CouplingImportOptions` controlling how `coupling_import` `ref`s resolve (esm-spec §10.10.3).
`FlattenedSystem`	`flattened_system`	type	Spec-compliant flattened coupled system (§4.7.5).
`FlattenError`	`flatten_error`	error	Errors raised by `flatten` and `flatten_model` during spec-compliant coupled-system flattening.
`FlattenMetadata`	`flatten_metadata`	type	Provenance metadata for a flattening pipeline run.
`FloatKeyError`	`float_key_error`	error	Raised when a relational key contains a floating-point (or otherwise non-integer / out-of-domain) component, violating `CONFORMANCE_SPEC.md` §5.5.1 rule 1 (“floats are forbidden…
`ForcingSet`	`forcing_set`	type	The forcing a program evaluation reads (API_SPEC §5.8): one immutable buffer per `RhsProgram::forcing_slots` entry, stamped with a process-unique epoch.
`ForcingSlot`	`forcing_slot`	type	One buffer of a `ForcingSet`: the variable it serves, its shape, and its kind.
`format_canonical_float`	`format_canonical_float`	function	Format a finite f64 per RFC §5.4.6.
`free_parameters`	`free_parameters`	function	Extract all free parameters from an expression
`free_variables`	`free_variables`	function	Extract all free variables from an expression
`FunctionalUpdate`	`functional_update`	type	A registered handler computing a parameter’s new value when its update fires (esm-spec §5.5).
`GeometryError`	`geometry_error`	error	An error from the geometry kernel — a degenerate input ring or a failed clip.
`get_component_type`	`get_component_type`	function	Get the type of a component
`get_supported_migration_targets`	`supported_migration_targets`	function	Deprecated alias of `supported_migration_targets`.
`Graph`	`graph`	type	The graph kinds the esm-libraries-spec §4.8.3 text exporters render.
`GridPlan`	`grid_plan`	type	One grid: a set of variables sharing a spatial-dim signature, with the coordinates and dimension lengths that describe it (RFC §9).
`group_aggregate`	`group_aggregate`	function	Group-by + semiring aggregate (rule 5).
`group_gridding_by_grid`	`group_gridding_by_grid`	function	Partition output variables into GRIDS by their spatial-dim signature (RFC §9): variables over the same set of axes form one grid, so an atmosphere over `[lev, lat, lon]` and an…
`init`	`init`	function	Build a stepping integrator for `prob` (§2.5.6).
`InlineTestOptions`	`inline_test_options`	type	Per-document overrides for `run_inline_tests_paths`, returned by its `options_for` callback.
`Integrator`	`integrator`	type	A stepping integrator (§2.5.6) — the same lifecycle `solve` performs internally, exposed for callers that need to interleave their own work with the integration: the coupling…
`intersect_polygon`	`intersect_polygon`	function	Clip polygon `a` against polygon `b` on the given `manifold`, returning the overlap ring as `(lon, lat)` degree vertices.
`is_coupling_library_doc`	`is_coupling_library_doc`	function	True when `raw` has the coupling-library-file FORM (top-level `coupling_roles`, esm-spec §10.9).
`is_ode_state`	`is_ode_state`	function	Membership test for `ode_states`.
`is_template_library_doc`	`is_template_library_doc`	function	True when `raw` has the template-library-file FORM (top-level `expression_templates`, esm-spec §9.7.1).
`LIBRARY_VERSION`	`library_version`	constant	This crate’s OWN version — NOT the `.esm` format version, which is `SCHEMA_VERSION`.
`load_document`	`load_document`	function	Load and parse an ESM document that is ALREADY parsed as a `serde_json::Value` — the same document a `.esm` file holds, just already decoded.
`load_path`	`load_path`	function	Load an ESM file from a filesystem path.
`load_string`	`load_string`	function	Load and parse an ESM file from JSON string
`LoaderField`	`loader_field`	type	One provider-served loaded field the flattened system consumes (esm-spec §8.5; esm-libraries-spec §4.7.5 step 4 `loader_fields`).
`LoadOptions`	`load_options`	type	Options controlling how `load_string_with_options` / `load_document_with_options` / `load_path_with_options` parse an ESM file (esm-spec §9.7).
`lower_enums`	`lower_enums`	function	Lower every `enum`-op node in `file` to a `{op: "const", value: <int>}` node using the document’s top-level `enums` block, returning a NEW document.
`lower_enums_mut`	`lower_enums_mut`	function	`lower_enums`, applied in place.
`lower_reactions_to_equations`	`lower_reactions_to_equations`	function	Lower a reaction network to an ODE equation list.
`materialize_value_invention`	`materialize_value_invention`	function	Run the build-time value-invention engine over a raw model document.
`Metadata`	`metadata`	type	Metadata section
`migrate`	`migrate`	function	Migrate an ESM file from the version it declares to `target_version`.
`MigrationError`	`migration_error`	error	Migration error that occurs when migration fails.
`Model`	`model`	type	ODE-based model component
`ModelVariable`	`model_variable`	type	Variable within a model
`observed_definitions`	`observed_definitions`	function	Each observed unknown’s defining RHS, keyed by name.
`observed_field`	`observed_field`	function	The build-time field named `name`, from `prob`’s construction.
`observed_unknowns`	`observed_unknowns`	function	Unknowns defined by a bare-variable LHS (`y ~ f(…)`) — eliminable, materializable.
`ode_states`	`ode_states`	function	Unknowns appearing under `D(·, t)` on some equation LHS.
`Operator`	`operator`	type	Runtime operator reference
`OutputError`	`output_error`	error	Failure deriving an `OutputPlan` — the output-side mirror of the loader seam’s errors.
`OutputMeta`	`output_meta`	type	The document slice a streaming writer needs so it can name axes and emit CF coordinates (RFC §7–§8) without importing the document model.
`OutputPlan`	`output_plan`	type	The full derived output plan: every grid the run produces.
`ParameterSweep`	`parameter_sweep`	type	A parameter-sweep specification on a `ModelAnalysis` (schema `ParameterSweep`).
`ParameterUpdate`	`parameter_update`	type	One update rule: WHEN a parameter refreshes, and WHAT from (esm-spec §5.4).
`ParamSlot`	`param_slot`	type	One positional parameter of a program: `p[k]` is RhsProgram::parameters``[k].
`parse_equation`	`parse_equation`	function	Parse `lhs = rhs` into an `Equation`.
`parse_expression`	`parse_expression`	function	Parse a single expression string into an AST expression — the inverse of `crate::display::to_ascii`.
`parse_unit`	`parse_unit`	function	Parse a unit string into a Unit struct
`Partition`	`partition`	type	The partition of one model: the class summary, the materialization-point set, and the hot-tree / per-event-handler emptiness (§5.7.5 three execution outputs).
`plan_dimension_coordinates`	`plan_dimension_coordinates`	function	Resolve the `coordinates` registry (§8.3) into the CF dimension coordinates for a set of `VarGridding`s — the Rust mirror of Julia’s `plan_dimension_coordinates`.
`Plot`	`plot`	type	A plot specification of a `ModelAnalysis` (schema `Plot`).
`PlotAxis`	`plot_axis`	type	Axis specification of an analysis `Plot` (schema `PlotAxis`).
`PlotSeries`	`plot_series`	type	A single named series of a multi-series line/scatter `Plot` (schema `PlotSeries`).
`PlotValue`	`plot_value`	type	A scalar value derived from a trajectory, used for heatmap / color channels (schema `PlotValue`).
`polygon_area`	`polygon_area`	function	Unsigned `polygon_area` of an overlap ring under `manifold` — the imperative
`rank`	`rank`	function	Dense integer renumbering (rule 3) at Rust’s native 0-based emission: assign IDs by position in the sorted `distinct` sequence.
`Ranking`	`ranking`	type	Result of `rank`.
`Reaction`	`reaction`	type	Chemical reaction
`ReactionSystem`	`reaction_system`	type	Reaction network component
`ReferenceEdge`	`reference_edge`	type	A directed `source → target` edge: source references / depends on target.
`ReferenceError`	`reference_resolution_error`	error	Deprecated alias of `ReferenceResolutionError`.
`ReferenceGraph`	`reference_graph`	type	The resolved reference DAG for one model — the partition pass’s input.
`ReferenceResolutionError`	`reference_resolution_error`	error	A reference could not be resolved, or the reference graph has a cycle.
`ReferenceVertex`	`reference_vertex`	type	A vertex in the reference graph, addressed by a kind-namespaced `key`.
`reject_solver_external_pre_v13`	`reject_solver_external_pre_v13`	function	Reject `solver.external` in a file declaring esm < 1.3.0.
`reject_solver_pre_v11`	`reject_solver_pre_v11`	function	Reject a top-level `solver` block in a file declaring esm < 1.1.0.
`reject_solver_time_span_pre_v13`	`reject_solver_time_span_pre_v13`	function	Reject `solver.time_span` in a file declaring esm < 1.3.0.
`reject_template_imports_pre_v08`	`reject_template_imports_pre_v08`	function	`expression_template_imports`, top-level `expression_templates` (template-library files), and `metaparameters` arrive at `esm: 0.8.0`; files declaring an earlier version that…
`remake`	`remake`	function	A NEW EsmProblem with `changes` applied and everything else shared (§2.5.5).
`remove_coupling`	`remove_coupling`	function	Remove a coupling entry from an ESM file by index
`remove_equation`	`remove_equation`	function	Remove an equation from a model by index
`remove_reaction`	`remove_reaction`	function	Remove a reaction from a reaction system by index
`remove_species`	`remove_species`	function	Remove a species from a reaction system
`remove_variable`	`remove_variable`	function	Remove a variable from a model
`resolve_references`	`resolve_references`	function	Resolve reference edges for every model in `document`.
`resolve_subsystem_refs`	`resolve_subsystem_refs`	function	Resolve every subsystem `{ “ref”: …
`resolve_template_machinery`	`resolve_template_machinery`	function	Resolve every esm-spec §9.7 construct of the ROOT document `raw_data` (relative import refs resolve against `base_path`): imports recursively with per-edge instantiation,…
`resolve_time_span`	`resolve_time_span`	function	The run interval, most specific first (esm-spec §2.2.7, by the §2.2.2 order):
`resolve_tolerances`	`resolve_tolerances`	function	Resolve integration tolerances most-specific first (esm-spec §2.2.2):
`ReturnCode`	`return_code`	type	Why a solve stopped — the SciML `ReturnCode` vocabulary (`esm-libraries-spec.md` §2.5.3).
`rhs_program`	`rhs_program`	function	The right-hand side `prob` compiled, as a program `RhsProgram::select`, `RhsProgram::halo`, `RhsProgram::tile` and `RhsProgram::lanes` accept (API_SPEC §5.8).
`run_inline_tests`	`run_inline_tests`	function	Run every inline test (esm-spec §6.6, including the §6.6.5 PDE assertions) of the selected model(s) of `file` through the official simulation pathway…
`sampled_parameters`	`sampled_parameters`	function	Parameters with a `distribution` and no update — drawn once at setup.
`SCHEMA_VERSION`	`schema_version`	constant	ESM schema version supported by this implementation.
`SchemaError`	`schema_error`	error	A schema validation error
`simplify`	`simplify`	function	Simplify an expression (basic symbolic simplification).
`SimulateError`	`simulate_error`	error	Errors raised building an `crate::problem::EsmProblem` or running `crate::problem::solve`.
`skolem`	`skolem`	function	Canonical-tuple Skolem key (rule 4).
`skolem_edge`	`skolem_edge`	function	Canonical key for an undirected pair (a symmetric relation): `(min(a,b), max(a,b))`.
`Solution`	`solution`	type	A simulation result.
`solve`	`solve`	function	Run `prob` to completion (§2.5.3).
`Solver`	`solver`	type	Document-scoped, OPTIONAL solver hints (esm-spec §2.2).
`solver_external_location`	`solver_external_location`	function	Where the document’s `solver.external` points (esm-spec §2.2.6), or `Ok(None)` when the document names no run configuration.
`SolverTimeSpan`	`solver_time_span`	type	`solver.time_span` (esm-spec §2.2.7): the `{start, end}` shape of `tests[].time_span` (`TimeSpan`), except that each bound may also be an RFC 3339 UTC timestamp, so it is a…
`Species`	`species`	type	Chemical species in a reaction system.
`StateBlock`	`state_block`	type	One state variable’s block of `u` (API_SPEC §5.8): `shape` column-major from `flat_offset`, first index fastest.
`step`	`step`	function	Advance `integrator` by one grid point (§2.5.6’s `step!`).
`stoichiometric_matrix`	`stoichiometric_matrix`	function	Generate stoichiometric matrix from a reaction system
`StructuralError`	`structural_error`	error	A structural validation error
`substitute`	`substitute`	function	Substitute variables in an expression, returning a new expression.
`substitute_in_model`	`substitute_in_model`	function	Substitute variables in all expressions within a model (equations plus discrete/continuous events; other model fields are cloned unchanged).
`substitute_in_model_with_context`	`substitute_in_model_with_context`	function	`substitute_in_model` with scoped reference resolution.
`substitute_in_reaction_system`	`substitute_in_reaction_system`	function	Substitute variables in all reaction-rate expressions within a reaction system.
`substitute_in_reaction_system_with_context`	`substitute_in_reaction_system_with_context`	function	`substitute_in_reaction_system` with scoped reference resolution.
`substitute_with_context`	`substitute_with_context`	function	Substitute variables in an expression with scoped reference resolution (esm-spec §2.3.3).
`supported_migration_targets`	`supported_migration_targets`	function	The schema versions `from_version` can be migrated to.
`SweepDimension`	`sweep_dimension`	type	One axis of a `ParameterSweep` (schema `SweepDimension`): exactly one of `values` / `range` is present.
`SweepRange`	`sweep_range`	type	Generated range of values for one `SweepDimension` (schema `SweepRange`).
`system_kind`	`system_kind`	function	The DERIVED system kind (esm-spec §6.3.1), which a binding uses when the `system_kind` field is absent and checks against when it is present.
`SystemKind`	`system_kind`	type	The derived system kind (esm-spec §6.3.1).
`TermOrigin`	`term_origin`	type	Who authored one `Contribution` to a flattened equation (esm-libraries-spec §4.7.5, “Per-term provenance”).
`TimePoint`	`time_point`	type	One bound of a `SolverTimeSpan`, kept in its authored form.
`TimeSpan`	`time_span`	type	Simulation time interval used by inline model tests.
`to_ascii`	`to_ascii`	function	Render `target` as plain ASCII.
`to_dot`	`to_dot`	function	Render `graph` as Graphviz DOT (esm-libraries-spec §4.8.3).
`to_json`	`to_json`	function	Serialize an ESM file to JSON string
`to_json_compact`	`to_json_compact`	function	Serialize an ESM file to compact JSON string (no pretty printing)
`to_json_graph`	`to_json_graph`	function	Render `graph` as a JSON adjacency-list document (esm-libraries-spec §4.8.3).
`to_latex`	`to_latex`	function	Render `target` as LaTeX.
`to_mermaid`	`to_mermaid`	function	Render `graph` as Mermaid (esm-libraries-spec §4.8.3).
`to_unicode`	`to_unicode`	function	Render `target` as Unicode mathematical notation.
`Tolerance`	`tolerance`	type	Numerical comparison tolerance used by inline model tests.
`Unit`	`unit`	type	Represents a physical unit with dimensions
`UNIT_FINDING_ANALYSIS`	`unit_finding_analysis`	constant	See `UNIT_FINDING_DIMENSIONAL_MISMATCH`.
`UNIT_FINDING_DIMENSIONAL_MISMATCH`	`unit_finding_dimensional_mismatch`	constant	The cross-binding `code` values a dimensional finding can carry, as surfaced on `crate::validate::UnitWarning::code`.
`UNIT_FINDING_DIMENSIONLESS_LITERAL`	`unit_finding_dimensionless_literal`	constant	A check site the CURRENT neutral-literal rule passes or skips fails once a nonzero bare numeric literal is read as dimensionless at scale 1 (esm-spec §4.8.6).
`UNIT_FINDING_UNPARSEABLE`	`unit_finding_unparseable`	constant	See `UNIT_FINDING_DIMENSIONAL_MISMATCH`.
`UnitFinding`	`unit_finding`	type	A single dimensional finding produced while propagating an expression.
`UnitWarning`	`unit_warning`	type	A dimensional-analysis finding surfaced by validation.
`validate`	`validate`	function	Perform structural validation on an ESM file
`validate_complete`	`validate_text`	function	Deprecated alias of `validate_text`.
`validate_equation_dimensions`	`validate_equation_dimensions`	function	Validate that an equation’s LHS and RHS have matching dimensions.
`validate_text`	`validate_text`	function	Validate an ESM file completely (schema + structural validation)
`ValidationResult`	`validation_result`	type	Result of structural validation
`ValueInventionError`	`value_invention_error`	error	A value-invention build-time materialisation error (the Rust analog of Julia’s `TreeWalkError` value-invention codes).
`ValueInventionResult`	`value_invention_result`	type	Result of `materialize_value_invention`.
`VarGridding`	`var_gridding`	type	The gridded layout of one output base-variable, derived from the flat state-element names (RFC §7).
`VariableKind`	`variable_kind`	type	Type/kind of variable, as the graph renders it.
`VariableNode`	`variable_node`	type	Node representing a variable in an expression graph
`VarPlan`	`var_plan`	type	One output variable: what a writer declares, plus the inversion that fills it.
`VertexKind`	`vertex_kind`	type	The three kinds of vertex in the reference graph.
`write_path`	`write_path`	function	Write an ESM file to `path` as pretty-printed JSON.