# title
BUS-1 v0.2 Symbol Role Vocabulary, Tier One

# status
Normative. Roles are hierarchical dotted paths that degrade by truncation (BUS-1 13.4.2). An implementation MUST support every root; support for deeper leaves is RECOMMENDED and never required.

# roots.pipe.note
Medium is carried by the binding or the represented entity.

# roots.control.note
A write binding attaches to one of these.