Datatypes
A datatype can be a simple type, a structured type or a collection of items of the same type. FEEL defines a number of simple base types, and in the Trisotech platform, collections of these are also considered built-in types.
FEEL Built-In Types
Text  | 
An ordered sequence of Unicode characters.  | 
Number  | 
A numeric value. There is no difference between integer and floating point, a single type represents both.  | 
Boolean  | 
A true or false value.  | 
Days and time duration  | 
A duration expressed using a number of days, hours, minutes and seconds.  | 
Years and months duration  | 
A duration expressed using years and months.  | 
Date and time  | 
A date and time value that can be expressed using an optional offset from the Universal Coordinated Time (UTC).  | 
Date  | 
A date value.  | 
Time  | 
A time value.  | 
File  | 
A structured data type that represents unstructured data as a file. The file data type has the following attributes: name, extension, created, modified, size, type, author, url. Note that this is not a FEEL defined type.  | 
Folder  | 
A structured data type that represents unstructured data as a folder. Available only in Case Modeler. The folder data type has the following attributes: name, created, author, files, folders. Note that this is not a FEEL defined type.  | 
Any  | 
Represents any structured data type in an abstract manner.  | 
Collection of Text  | 
Collection of text items.  | 
Collection of Number  | 
Collection of number items.  | 
Collection of Boolean  | 
Collection of boolean items.  | 
Collection of Days and time duration  | 
Collection of days and time duration items.  | 
Collection of Years and months duration  | 
Collection of years and months items.  | 
Collection of Date and time  | 
Collection of date and time items.  | 
Collection of Date  | 
Collection of date items.  | 
Collection of Time  | 
Collection of time items.  | 
Collection of File  | 
Collection of file items. Note that this is not a FEEL defined type.  | 
Base Type Examples
Name  | 
Description  | 
Expression → Value  | 
String (Text)  | 
text enclosed in quotes or italicized  | 
“Trisotech” or Trisotech → Trisotech  | 
Boolean  | 
two possible values true or false.  | 
1=1 → true, 1=0 → false  | 
Number  | 
numerical value.  | 
sqrt(4) → 2  | 
Date  | 
YYYY-MM-DD format written in bold italic or as a function parameter string.  | 
2017-11-27 or date(“2017-11-27”) → November 27, 2017  | 
Time  | 
HH:MM:SS format written in bold italic or as a function parameter string.  | 
09:12:00 or time(“09:12:00”) → 9:12 am local time  | 
Date and Time  | 
YYYY-MM-DDTHH:MM:SS format written in bold italic or as a function parameter string  | 
2017-11-27T09:12:00 or date and time(“2017-11-27T09:12:00”) → 9:12 am local time, November 27, 2017  | 
Duration  | 
P[n]Y[n]M[n]DT[n]H[n]M[n]S format where [n] is a number written in bold italic or as a function parameter string.  | 
duration(“PT15M”) → 15 minutes duration; duration(“P3M1D”) → 3 months, 1 day duration  | 
Null  | 
missing or invalid value  | 
sqrt(“x”) → null  | 
User-Defined Types
In addition, users can define custom types called item definitions, which include:
- 
Built-in types with constraints
 - 
Structured types including components. A component may be a simple type, a collection, or another structured type.
 - 
Collections of any defined type
 
The item definitions available in the model are listed in the DMN ribbon, under Data Types.