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: 6f38e67166333a099186679a0ab671ad6416cbc7ebe9c766416f7955889e65e6