About: http://webisa.webdatacommons.org/401292472

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The author describes the file types and layers that are expected, along with everything you need to know about gerber files and other formats.The book is also well-structured for use as a reference.
http://www.w3.org/ns/prov#wasQuotedFrom	amazon.com