Geospatial Predicate Question

[Jamie Johnson]

Can someone clarify the difference between isWithin and Contains in regards
to Solr's spatial support?  From
https://wiki.apache.org/solr/SolrAdaptersForLuceneSpatial4 I see that if
you are using point data you should use Intersects, but it is not clear
when to use isWithin and contains.  My guess is that you use isWithin when
you want to know if the query shape is within the shape that is indexed and
you use contains to know if the query shape contains the indexed shape.  Is
that right?