def unregisterSheet(self, name):
        if self.sheets.has_key(name):
            del self.sheets[name]
Returns a GeoJSON representation of the geomtry field in a `geojson`
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/spreadsheet/spreadsheet_registry.py/SpreadsheetRegistry.unregisterSheet--crossover with--dataset/ETHPy150Open CollabQ/CollabQ/vendor/django/contrib/gis/db/models/query.py/GeoQuerySet.geojson