# EMS Selector Specification Panel

You can specify a TIBCO Enterprise Message Service message selector in the EMS Selector Specification panel.

## Panel Layout

You can access this panel by entering `SEL` in the Recipe Details panel. For details, see Recipe Details Panel

    SXTP05S------------------ EMS Selector Specification --------------------------
     Command ===>

     Selector ===>

     (End of Selector)

## Field Description

The following table lists the fields in the EMS Selector Specification panel:

Field | Description
--- | ---
Command | Currently not used.
Selector | A free-form field for specifying a selector statement. A message selector is a string that contains an expression. The syntax of the expression is based on a subset of the SQL92 conditional expression syntax. A message selector specifies a set of messages based on the values of message headers and properties. A selector matches a message if, after substituting header and property values from the message into the selector string, the string evaluates to true. Note: For information on the message selector syntax, see the section on the message class in the relevant TIBCO Enterprise Message Service API reference documentation.

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