Building Definition Language

BDL shall support multiple forms of geometry while preserving semantic identity and coordinate context.

Geometry forms may include:

point;

line;

curve;

plane;

surface;

polygon;

solid;

parametric primitive;

swept profile;

constructive geometry;

boundary representation;

mesh;

point cloud;

external geometry reference.

Simple geometry may be declared directly:

geometry Column_C01_Geometry {

type: extruded_profile;

profile: rectangle(140 mm, 140 mm);

length: 2400 mm;

axis: [0, 0, 1];

}

Complex geometry may reference an external model:

geometry Node_N01_Geometry {

source: resource("models/node-n01.step");

format: STEP;

coordinates: @Node_N01.local_coordinates;

integrity: sha256("...");

}

Every Geometry Entity shall define:

Geometry ID;

representation type;

units;

coordinate system;

source;

accuracy;

level of geometric detail;

configuration status;

integrity reference.

BDL shall distinguish among:

design geometry;

manufacturing geometry;

simplified analysis geometry;

collision geometry;

visualization geometry;

surveyed geometry;