The txtContent attribute controls the content of a text element inside the grobject. It makes most sense to specify grobjects in a way that it is possible to set the text for an individual text element. This can be used for translation purposes or to show different numbers in dimensions based on configurations. Query A query is a way to extract information from a CGM file. There has not been a standardized approach so far.
Most discussions go around text search, however, there is probably more to be found.
Apparently there is the need to search for a particular object based on its ID or name. Apart from that I can think about a searched based on certain attributes of an object based on the definitions above. The result would be a list of items. This list could be processed subsequently item by item. The research and implementation of query methods has not been concluded yet.