AEC Industry Terms
Sheet
A single page from a construction drawing PDF. Identified by sheet number (A-101, E-201, S-301). The letter prefix indicates discipline.
Discipline
The engineering trade responsible for a sheet. Common codes: A (Architectural), S (Structural), M (Mechanical), E (Electrical), P (Plumbing), FP (Fire Protection), C (Civil).
Grid
The building’s coordinate system. Grid lines (A, B, C / 1, 2, 3) are shared across all disciplines and floors. Grid intersection “B-3” refers to the same physical location on every sheet.
Schedule
A table on a drawing sheet listing specifications for a category of elements (door schedule, window schedule, finish schedule, equipment schedule).
Legend
A table pairing graphical symbols with their text descriptions. Used to define what each symbol on a plan view represents.
Keynote
A numbered annotation on a plan view with a leader arrow pointing to a specific element. References a keynote table elsewhere on the drawing set.
RFI
Request for Information — a formal question from the contractor to the design team about ambiguities or conflicts in the drawings.
Clash
A conflict where two building elements from different disciplines occupy the same physical space (e.g., a duct intersecting a beam at the same grid location and elevation).
Bedrock Platform Terms
Drawing
A PDF file uploaded to Bedrock. Contains one or more sheets. Often represents one revision of a drawing set (e.g., “Arch Set Rev B”).
Block
A self-contained region on a sheet — a plan view, detail, schedule, legend, notes section. Bedrock detects blocks automatically during processing.
Feature
A detected entity within a block — a room, door, wall, receptacle, dimension, symbol. Features nest via parent containment (a receptacle is inside a room).
Overlay
A visual comparison between two matched blocks from different drawing revisions, highlighting additions (green) and deletions (red).
Relation
A typed edge in the Drawing Index knowledge graph connecting blocks or features. Examples: scheduled_in (door to schedule), defined_by (symbol to legend), references (callout to detail on another sheet).
Drawing Index
The structured knowledge graph that Bedrock builds from construction drawings. Contains all sheets, blocks, features, relations, and grid data — queryable via REST API or MCP.
MCP
Model Context Protocol — an open standard for connecting AI agents to external data sources. The Bedrock MCP server gives agents like Claude and ChatGPT direct access to the Drawing Index.