How to get the table's itemno by a rvdata of cell

[li_nummereins]

Refering to the quiz in the demos, I make a program.There are several tables in my document, only one can be chosen. How do I get the table's itemno in the rv through RVDATA of the CELL?I want to judge the table whether to can be operated by the table's itemtext.

[Sergey Tkachenko]

table := cell.GetTable;
ItemNo := table.GetMyItemNo;

[li_nummereins]

Thank you very much.