Assertion: ounce | /r/HasProperty | retained for these four commodities
Facets:
value: from the roman system
type: LOCATION
value: in order to preserve the standards
type: PURPOSE
Source sentences:
text: The troy ounce was retained from the Roman system for these four commodities in order to preserve the standards previously set across time, as the two-system standard would have created problems for the monetary system of the day.