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Roles are definition definitions of who will be responsible for a task. 

For a role you can configure the following:

Name
Name of a role to identify.

Caption
Caption of a role. Captions are shown to to the users, and can be localized when it is needed.

Decision Logistic

Decision logistic part is consist two options.

Decision Table

It is a table in which rules are written to assign a task to a different person/position/group/department according to the data in the form. Rules are written without using code.  Rules are entered in the input part. In the output part, the responsible/responsibles to be assigned when the rule runs are selected.

For more information click on:  Decision table

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Expression

Role Script

Script that returns the list of the responsible persons.    

Example Role Scripts

Role script has a wizard to quickly build common used role definitions, but you can you use the following example scripts if needed.

Assign to a specific identity.

Id number of identity can be specified from the role wizard with selecting an identity option.

$Membership.Get('d3b1fe89-6873-4438-8762-164ed73a9054');

Assign

...

by the Data Model field

Assume that a data field has an "Employee" field which is filled by user the user form.

$Xml.Evaluate('Employee');

Assign Multiple Users

Using a java script javascript array, it allows assigning multiple users.

[ $Xml.Evaluate('Employee'), $Membership.Get('d3b1fe89-6873-4438-8762-164ed73a9054') ]

Alternatively you can use semicolon to specify multiple users. 

$Xml.Evaluate('Employee') + ';' + 'd3b1fe89-6873-4438-8762-164ed73a9054'

Find Manager

Using this javascript array, 

 it is used to assign a role to the manager of the user who completed the work in the previous step.

$Membership.FindManager( $WorkItem.Previous.CompletedBy );