Here's the complete list of supported attribute types. In addition to the default types (see General information on parameters), the "rich-text", "file", "user" and "composite" types are also supported.
Type
Description
Widget default modification
string
Simple text
long
Integral
double
Decimal
rich-text
Rich text, with formatting (headings, bold, images, tables, etc.)
boolean
Boolean (checkbox)
date
Date
datetime
Date and time
binary
Binary file (downloaded from local hard disk)
file
Binary file (downloaded from local hard disk) or reference to a file in the resource explorer