OptionalnameThe name of the table.
A mirror of the name attribute in JSON.part's markup, which is authoritative;
carried so the name is answered without reading the markup. Read from the markup once when
absent.
OptionalpartThe part describing the table: its layout, its fields, and where it sits on the sheet.
Opaque: held as it was read and written back unchanged, since the table has no model yet. IPivotTable.getXML is the readable view of it.
The id of the cache the table summarizes.