About: http://webisa.webdatacommons.org/201599484

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	As you say, it is better practice to set the default quantity to a value such as 1 and change it as necessary when entering the order to prevent costly mistakes.
http://www.w3.org/ns/prov#wasQuotedFrom	estuarysolutions.com