Assertion: true porcelain | /r/HasProperty | perfected in ding ware
Facets:
value: during this period
type: TEMPORAL
Source sentences:
text: From the Song dynasty (960–1279) for several centuries elite taste favoured plain-coloured and exquisitely formed pieces; during this period true porcelain was perfected in Ding ware, although it was the only one of the Five Great Kilns of the Song period to use it.