* Each of them must use the following syntax: \<name\>:\<min nb\>_to_\<max nb\>_\<type\>
* with type being one of 'string','int', 'peer' or 'double'.
*
* Each of them must use the following syntax: \<name\>:\<min nb\>_to_\<max nb\>_\<type\>
* with type being one of 'string','int', 'peer' or 'double'.
*