# Library Scope Altium Toolkit provides reusable native Altium parsing behind the common ECAD toolkit API. Canonical results use CircuitJSON; source-only facts and historical 1.1.41 APIs remain explicit Altium extensions with maintained implementations. ## In Scope - Canonical `Parser`, `ProjectLoader`, error, progress, cancellation, and worker contracts shared with CircuitJSON, Gerber, and KiCad - Immutable CircuitJSON document envelopes, common project envelopes, and reusable document contexts - Shared CircuitJSON render, interaction, query, manufacturing, simulation, and data-only 3D scene services - Preservation of audited Altium 1.1.41 `/extensions` API signatures and public asset entrypoints and targets, with tested bug fixes and performance improvements - `.SchDoc`, `.PcbDoc`, `.PCBDwf`, `.SchLib`, `.PcbLib`, `.PrjPcb`, `.PrjScr`, and `.IntLib` parsing from `ArrayBuffer` - OLE and binary stream helpers needed by parser recovery - Schematic SVG rendering - PCB SVG rendering - BOM HTML rendering - PCB 3D scene-description data, including board-region outline refinement and silkscreen drill cutout contours - Embedded PCB/PcbLib font extraction and basic text metrics for deterministic SVG rendering - Read-only PCB primitive record registry metadata and base64 raw-record preservation for unsupported or partially decoded PcbDoc/PcbLib streams - Read-only PCB pad/via detail recovery, including hole tolerances, mask/paste semantics, stack metadata, via-protection sidecars, custom pad shape links, and PCB union metadata - Static 3D summary HTML - Parser worker entrypoint for host applications - Optional renderer CSS - Versioned normalized model schema identifiers and machine-readable schema contracts - Source component client, source bundle exporter, generated `.SchLib` and `.PcbLib` byte exporters, and batch export orchestration with progress, checkpoint, append-skip, merged output, and retry-friendly client hooks ## Out Of Scope - Application state management - File picker, drag/drop, or session orchestration - Schematic/PCB pan and zoom event controllers - Three.js runtime, OrbitControls, canvas mounting, and picking - STEP mesh loading and browser script injection - Model ZIP export UI and download orchestration - Choosing a hosted component-source provider for applications; hosts inject fetch and endpoint configuration explicitly - Server, deployment, and app metadata endpoints - Native document authoring, round-trip writing, GUI automation, and compiled multi-sheet project netlist generation - Pretending an Altium-only feature exists in another source toolkit when no truthful CircuitJSON or native implementation is possible