| base64 | A base64-encoded binary stream |
| boolean | A boolean value expressed as an integer, 0 or 1 |
| date | An ISO8609-encoded date |
| double | A 64-bit IEEE floating pointer number |
| int | A 32-bit signed integer |
| list | An ordered list, like an array |
| long | A 64-bit signed integer |
| map | Represents serialized objects and Hashtables |
| null | Null represents a null pointer |
| ref | An integer referring to a previous <list> or <map>
instance |
| remote | A reference to a remote object |
| string | A 16-bit unicode character string encoded in UTF-8 |
| xml | An XML document encoded as a 16-bit unicode character
string encoded in UTF-8, following the rules for <string> |