Grid Concepts
This is the shared vocabulary for people building and reading Grid models.
Grid Concepts
This is the shared vocabulary for people building and reading Grid models.
Workbook
A workbook is the user-facing container. It contains ordinary sheets and specialized workbook surfaces such as Dataset, Table, Map, Charts, Document, Board, and Discussion.
Model
A model is the executable state behind a workbook. It includes reactive bindings, formulas, inputs, connector bindings, resident values, metadata, and the values those pieces produce.
Binding
A binding associates an address with a value or calculation. Bindings are reactive: when a dependency changes, Grid updates the affected derivations. Most authored calculations use cells or semantic names; large resident values also use named bindings.
Cell
A cell combines a reactive calculation binding with an address in the workbook
model. A grid coordinate such as A1 is a spatial address. A name such as
Revenue = A1 adds a semantic address for the same binding, and a range binding such as
prices = A1:D50 names a spatial region.
Symbol
A symbol is an authored address for a binding. It can be a coordinate such as
A1, a semantic name such as Revenue, a qualified address such as
Sheet1!B2, or a surface slot such as Map_1!config.
When a plain named assignment contains only one reference, the name is an alias:
Revenue = A1 means that both symbols address the same binding. A calculated
assignment such as Tax = Revenue * rate creates another binding.
Formula
A formula computes a value from literals, functions, references, collections, relations, resident values, or external data. Authors write the relationship; Grid handles dependency order, recalculation, and execution strategy.
Symbolic Expression And Hybrid Operation
A symbolic expression is the same resident, portable Tree value used by Grid's
grammar-bound computation, refined under math.expression. symbol
declarations create exact unknowns; SYMBOLIC.* operations return bounded
records with completion, conditions, work, and replayable certificates. Some
operations are entirely Grid-owned. Methods that require FLINT are admitted
only when the selected Pro package advertises the exact qualified native
capability; FLINT never becomes a second language or evaluator.
Predicate
A predicate says what is true about one symbol or between two symbols. Unary
predicates such as proposal is :reviewed attach reactive properties to the
authored symbol. Binary predicates such as design before launch and
parcel inside district support bounded temporal or topological inference,
uncertainty queries, contradiction detection, and explanation. See the
predicate guide.
Rule
A rule reacts to state or time. WHEN, EVERY, and AT blocks let models set
values when conditions or schedules fire.
Connector
A connector brings external data into a model. Event connectors deliver source events; dense range connectors such as Spreadsheet-TV deliver compact rectangle frames.
Durable Coordination
Grid's coordination fabric owns durable jobs, control records, model-home routing, connector delivery, and peer movement. The ordinary lane uses local durable stores and the existing connector paths. An explicitly selected v2 lane adds exact-node authenticated transport, durable replay and outbound authority, and optional fenced DDIL convergence without changing formula meaning.
Frame
A frame is a columnar analytical data shape for bulk reads, filtering, projections, and columnar analytics.
Table
A table is the model-local transactional record path. It is distinct from a frame: tables are for append/update/read record workflows, while frames are for columnar analytical execution.
Geo
Geo covers spatial values, reusable indexes, map surfaces, and spatial kernels such as nearest-neighbor, bbox filtering, distance fields, and joins.
Workbook Surface
A workbook surface is a view over model state. Sheets show cells; maps, charts, documents, boards, datasets, and apps show the same state through a purpose-fit interface.
Research Workspace
Research Workspace is a Pro-only, model-scoped workflow interface rather than a second model or workbook surface. It operates on immutable model artifacts for evidence capture, purpose-bound policy, bibliography standards, specialist validation, and scholarly release. Contextual actions in Experiments, Molecule, and Document open the same workspace and preserve one source of research state.