<http://schema.org/about>
"Structural drawings and masonry, waffle slab and roof slab, beam and vault, joist construction details, sections of main girders, foundation, masonry, compression layer systems; details ribs and sections on slopes of roof slabs."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/one-family-housing,-split-level-design_65697>