Ideal method to get db schema from clients?

Question

Hi, What would be an ideal way of getting db schema designs from clients via the web? Was thinking of having a textarea in a form and ask them to enter the field names, max length, and sample data.

E.g.

FirstName, 20, Joe

LastName, 20, John

Age, Integer, 25

Bio, Text, Bio info about Joe John ....

Or should I ask them to email or attach it in an excel spreadsheet?