Format
The format required for the Attribute is:
<type>:<value>:<message number>
Supported type options are: "required" | "minlength" | "maxlength" | "notequal"
Example
required:true:val-msg1,minlength:5:scl-msg2Form
In that example field will be required and will display error message(val-msg1) under input, if not filled.
The form field also has a minlength of 5, if length is less than 5 characters then the message will be displayed(scl-msg2).