Define Products. Classify Taxes. Automatically.

Atlas is Espaze's universal product definition engine — a scope-aware catalog language that formally describes any tradeable product and computes its HSN code and GST rate as a deterministic, immutable output.

The Three Definitional Layers

Atlas is built on three hierarchical layers that together constitute a complete, formally grounded language for describing any product.

Global Attribute Dictionary

A typed, scope-annotated vocabulary of every attribute a product can carry — STRING, NUMBER, ENUM, BOOLEAN, and more. One source of truth for your entire catalog, eliminating duplicated and inconsistently named attributes across categories.

Scope-Aware Schema Layer

Bind attributes to schemas at the product master (SPU) or variant (SKU) level. The same attribute can carry different requirement semantics at different scopes — all within a single unified schema, without duplication.

Hierarchical Category Namespace

An infinite-depth category tree where only leaf nodes bear schema bindings and can be the target of product instantiation. Every product is assigned an unambiguous, formally structured definition.

How Atlas Works

From schema definition to tax classification in three formal phases

1

Define Your Schema

  • Compose product schemas from the global attribute dictionary
  • Assign attributes at product master or variant scope independently
  • Mark attributes as required or optional per scope binding
2

Instantiate Products & Variants

  • Validate product records against PRODUCT-scope schema entries
  • Validate SKU records against VARIANT-scope schema entries
  • ENUM values gate through a structured seller review workflow
3

Auto-Classify HSN & GST

  • Merge product and variant attributes into one evaluation map
  • Run priority-ordered, time-effective HSN rules against the map
  • Affix an immutable Tax Stamp — HSN code, GST rate, rule identity, timestamp

The Immutable Tax Stamp

Every SKU created on Atlas receives a Tax Stamp — a permanently sealed record of its HSN code and GST rate, written once at creation and never recalculated. Your tax liability is fixed at the moment of product description, regardless of future rule changes.

Downstream order-processing and invoicing systems can rely on the Tax Stamp directly, with no runtime queries to the classification engine.

Tax Stamp

Immutable · Written once at SKU creation

hsnCodeHSN code as resolved by the rule engine
gstRateGST rate (%) as resolved by the rule engine
ruleCodeIdentity of the rule that produced the classification
ruleVersionVersion of the matched rule
resolvedAtTimestamp at which classification was performed

Built for Reliability & Compliance

Every design decision in Atlas is optimised for correctness, auditability, and long-term catalog integrity.

Immutable Tax Stamps

HSN code and GST rate are computed once at SKU creation and never recalculated. Your tax liability is permanently established at the moment of product description, immune to future rule changes.

Append-Only Schema Versioning

Schemas evolve through strict append-only versioning. No existing version is ever modified — products and SKUs created against older versions retain full historical integrity.

Deterministic Classification

A given product description always produces the same HSN code. Priority-ordered, time-effective rules guarantee fully auditable and reproducible tax outcomes every time.

Brand Schema Extensions

Brands can additively extend base category schemas with their own attributes. Extensions are strictly additive and never interfere with tax classification logic.