Not sure about 2006, Alan, as I don't have that to test with any longer. But I get a list of the Promptstrings (this is what your code gets, even though you mentioned the Attribute Tag) just fine in 2012:
Command: TESt Select Block:
Command: ("Sheet Number" "Plan Date" "Sheet Title - 1st line:" "Sheet Title -
2nd line:" "Owners Name" "Address" "City-State" "Plans Status" "Revision
number:" "Revision date:" "Revision By" "Revision number:" "Revision date:"
"Revision By" "Revision number:" "Revision date:" "Revision By" "Revision
number:" "Revision date:" "Revision By" "Revision number:" "Revision date:"
"Revision By" "Revision number:" "Revision date:" "Revision By" "Draftsperson:")