<http://schema.org/about>
"Is the structural calculation of a family home which has an index; theoretical framework and practical framework in which practical framework can see the design of columns, beams and foundations of the house, etc"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/structural-calculations-and-designs-for-one-family-housing_63970>