| Accelerator: Spectrum sidecar client | The client for the Spectrum acceleration sidecar. |
| Accessibility: tagging primitives and the PDF/UA-2 structure model | Tagging primitives and the structure model. |
| Ast: semantic document tree and serialization | The semantic document tree and its serialization. |
| Audit: deterministic compliance-evidence export | Compliance-evidence export. |
| Barcode: 1D and 2D symbology encoders | The one-dimensional (1D) and two-dimensional (2D) symbology encoders. |
| Chaos: deterministic resilience-scenario harness | The resilience-scenario harness. |
| Cli: command handlers and external-validator adapters | Command handlers and external-validator adapters. |
| Compliance: PDF/R-1 validator, Arlington grammar, lifecycle tools | The validator, grammar, and lifecycle tooling. |
| Config: immutable document configuration | Immutable document configuration. |
| Conformance: ConformanceMode routing and the validation boundary | ConformanceMode routing and the validation boundary. |
| Content: textual + structured content model | The textual and structured content model. |
| ContentStream: PDF content-stream emitter | The content-stream emitter. |
| Contracts: 41 public interfaces (SPI) | The public interfaces of the service provider interface (SPI). |
| Core: Document facade + concern traits | The Document facade and the concern traits. |
| Document: DParts, split / merge, and vendor extensions | Document Parts, split and merge, and vendor extensions. |
| Event: PSR-14 lifecycle event taxonomy | The lifecycle event taxonomy. |
| Exception: typed exception hierarchy | The typed exception hierarchy. |
| Font: value types, embedding, and fallback | Font value types, embedding, and fallback. |
| Form: AcroForm interactive fields and flattening | Interactive form fields and flattening. |
| Graphics: path + shading + transform primitives | Path, shading, and transform primitives. |
| HTML: HTML+CSS to PDF rendering subsystem | The HTML and Cascading Style Sheets (CSS) rendering subsystem. |
| Inspect: PDF introspection and preflight | Introspection and preflight. |
| Layout: headers, footers, columns, booklet, page manager | Headers, footers, columns, booklet, and the page manager. |
| Linearization: Fast Web View output | Fast Web View output. |
| Render manifest: the portable render request | The portable render request. |
| Metadata: XMP packet build and streaming read | Extensible Metadata Platform (XMP) packet build and streaming read. |
| Multimedia: rendition, media clip, and screen parameters | Rendition, media clip, and screen parameters. |
| Navigation: annotations, links, outlines, actions, and attachments | Annotations, links, outlines, actions, and attachments. |
| Observability: hash-chained SIEM log and render reporting | The security log and render reporting. |
| PageBackfill: retained page buffer | The retained page buffer. |
| Performance: memory-fragmentation analyzer | The memory-fragmentation analyzer. |
| Security: encryption, crypto-policy, and the signing surface | Encryption, crypto policy, and the signing surface. |
| Support: shared utilities + Clock + Sleeper | Shared utilities, Clock, and Sleeper. |
| Telemetry: OpenTelemetry bridge and no-op fallback | The OpenTelemetry bridge and the no-op fallback. |
| Text: shaping seam, CJK, and run handling | The shaping seam and run handling, including Chinese, Japanese, and Korean (CJK) text. |
| Typography: font registry, subsetting, CMap, encoding, BiDi | The font registry, subsetting, CMaps, encoding, and bidirectional text. |
| ValueObjects: domain primitives + units | Domain primitives and units. |
| Writer: PDF 2.0 serializer + xref | The PDF 2.0 serializer and the cross-reference layer. |
