What is a compound?

A compound is a flexible code that expresses a concept which a single, strict standard cannot.

A compound is usually formed by combining two or more standards into a new meaning. For example, it may combine an object type with a particular attribute, or three different types with a measurement parameter. Compounds give a flexible way to encode data and bridge between commonly spoken terms and rigidly defined standards. Where standards divide and separate concepts, compounds bring them together.

While standards form a stable hierarchical structure for information, compounds float between them, evolve, and can change meaning without upsetting the order. They are translated, usually invisibly, into their component codes. Conversely, when a compound is created, pre-existing examples can be inferred and queried when matching data is present.

Compounds can also convert data records through derivatization using reaction masks. Each released compound is initially treated as a SKYDB Definitions Code, and may evolve or be retired over time.

Each released compound is assigned its own 10-digit SDC number.

Example: street lamp.