Building Definition Language

Component Placement defines the position and orientation of a Component Instance relative to an identified coordinate system or host datum.

A placement shall include:

placed Entity;

parent coordinate system;

translation;

orientation;

controlling datum;

placement method;

nominal pose;

measured pose where available;

positional tolerance;

angular tolerance;

status;

evidence.

Example:

placement Column_C01_Placement {

entity: @Column_C01;

parent_coordinates: @Building_CS;

datum: intersection(@Main_Grid.A, @Main_Grid.1, @Level_01);

nominal_pose {

position: [0 mm, 0 mm, 0 mm];

rotation: [0 deg, 0 deg, 0 deg];

}

tolerance {

x: ±2 mm;

y: ±2 mm;

z: ±1 mm;

rotation_z: ±0.25 deg;

}

}

Placement shall represent all six degrees of freedom where required:

translation along X, Y, and Z;

rotation about X, Y, and Z.

BDL shall distinguish:

design placement;

manufacturing placement;

assembly placement;

temporary placement;

surveyed As-Built placement;

current movable position.

A Component hosted by another Component may use host-relative placement:

parent_coordinates: @Wall_W01.local_coordinates;

Placement uncertainty shall be retained when the location is inferred or measured with limited accuracy.

A Component shall not be considered geometrically compatible merely because its reference point lies within the intended location. Its complete geometry, envelopes, Interfaces, and tolerances shall be evaluated.