OdDbSymbolTable::has (const OdDbObjectId&)

Determines whether the named record object exists in the predefined table object using the specified object ID, and returns True if and only if the predefined table object contains the specified named record object.

OdDbSymbolTable::has (const OdString&)

Determines whether the named record object exists in the predefined table object using the specified name, and returns True if and only if the predefined table object contains the specified named record object.