Building Definition Language

The BDL Type System shall define valid data structures, engineering entities, properties, relationships, and constraints.

Primitive Types shall include:

boolean;

integer;

decimal;

string;

date;

time;

duration;

identifier;

URI or resource reference.

Engineering Types shall include:

quantity;

vector;

matrix;

coordinate;

direction;

angle;

geometry reference;

material;

capability;

state;

evidence reference.

Collection Types shall include:

list;

set;

ordered sequence;

map;

bounded collection.

Entity Types shall include:

building;

site;

space;

Component;

Assembly;

Node;

Cartridge;

Interface;

Connection;

Profile;

Evidence.

Types shall define:

permitted properties;

required properties;

optional properties;

default values where safe;

relationship constraints;

cardinality;

unit dimensions;

validation rules.

Example:

type StructuralMember extends Component {

required material: MaterialRef;

required length: Quantity<Length>;

required end_interfaces: List<StructuralInterfaceRef>;

optional mass: Quantity<Mass>;

}

Safety-relevant defaults shall be avoided where omission could conceal missing engineering information.