Assertion: chart's column | /r/HasProperty | added
Facets:
Source sentences:
text: When this option is set to true, after every numeric column, two optional annotation string columns can be added, one for the annotation title and one for the annotation text.
text: ([ ['April',1000], ['May', 1170], ['June', 660], ['July', 1030] ]); This chart assigns roles explicitly, and so the optional columns can be added.