Guides

These guides provide in-depth coverage of cross-cutting topics in Layers. Each guide explains how multiple lexicons and primitives work together to support a particular capability.

• Temporal Representation: Composable temporal primitives for dates, durations, intervals, recurrence, and temporal relations (Allen's Interval Algebra). Maps to TimeML, OWL-Time, and ISO 8601.

• Spatial Representation: Composable spatial primitives for geographic coordinates, regions, paths, and spatial relations (RCC-8). Maps to GeoJSON, WKT, ISO-Space, SpatialML, and computer vision formats.

• Multimodal Annotation: How the polymorphic anchor type supports annotation across text, audio, video, image, and paged documents. Covers media records, temporal and spatial anchoring, and practical examples.

• Knowledge Grounding: Linking annotations to external knowledge bases (Wikidata, FrameNet, WordNet), building typed property graphs, defining ontologies, and the entity grounding workflow.

See Also

• Primitives for the core building blocks used across all guides
• Lexicon Overview for the full list of schemas
• Flexible Enums for the URI+slug pattern used throughout