Schema validation and lowering boundary

Informative catalog page. The linked OpenSpec source is the sole normative text.

Requirement ID: BSP-REQ-4DEE6A67EE3D
Capability: Bsol (Beskid Structured Object Language)
Status: Standard
Catalog revision: 9c11b6418f6db430f8fc249f71e01ce9273b2a681b77b32dafc44703b9b41734