This document discusses flow variables in Mule, which are used to set variables that can be accessed anywhere within a flow. A variable transformer is used to set or remove a variable on a message, with the scope of the variable being limited to the flow where it is set. The document provides an example of using the visual editor to set a variable named "helloMule" with a value of "Hello mule, we love you." It also describes the configuration wizard and properties for a variable transformer.

1. Variable

2. Variable
• Flow variable is use to set variable that can be used anywhere in a
flow. Use a variable transformer to set or remove a variable on the
message. The scope of this variable is limited to the flow where it is
set; when the message leaves the flow, the variable does not carry
over to the next flow or application.

3. Configuration
• Visual Editor • XML view
<set-variable
variableName="helloMule"
value="Hello mule, we love you."
doc:name="Variable"/>

4. Configuration wizard

5. Description
Property Description
Display Name Value which is to be shown in mule flow
Operation Set Variable : Select to set a new variable on your message (as shown in example
screenshot above).
Remove Variable : Select to delete an existing variable from your message.
Name Specify the name for the variable that you are creating or identify the name of the
variable that you are removing. If you are removing variables, this field accepts a
wildcard "*" character.
Value This field displays only if you are setting a new variable. Specify the value using
either a string or a Mule expression.
MIME Encoding (Optional) Indicates the MIME encoding language. Only appears when setting a
variable.
MIME Type (Optional) Indicates the MIME type. Only appears when setting a variable.

6. Variables type supported by Mule
• Mule supports following types of variable transformers
• Session variable
• Record variable
• Flow variable
• CORS variable (in new version of mule)

7. Thanks