compared with
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But as you see, the hierarchy is navigated *up and down*, which violates principles of covariance.
{warning:title=If someone does the CRM property}
If a data provider uses P9_consists_of (instead of skos:broader) to connect Periods, the following false inference will result:
- GAA42731 was present at Ancient Egypt, therefore it was present at all sub-period thereof, eg 26th Dynasty
{warning}
If a data provider uses P9_consists_of instead of skos:broader to connect Periods (whcih is the *right* thing), the following false inference will result:
- GAA42731 was present at Ancient Egypt, therefore it was present at all its sub-periods, eg 26th Dynasty
{warning}

{section}