Any build-in class like DataTable or Matrix?

I have some data (preferably objects, insteads of string) in the flash which I want to store as table format. So that I can query them. It is not datagrid as I do not have to show them.
Currently, I am use “xml class” because of the query function. However, “xml class” cannot store objects.

Is there a better choice?

Thanks a lot!