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TIBCO BusinessEvents® Enterprise Edition 6.3.1

# Variable

Adds a local variable for use in the current mapping. You can specify the name of the variable and whether you wish the variable to have a select attribute.

When you add a local variable, it appears in the Function and Scope Variables panels. You can supply any XPath expression to the new variable in the Function panel (either through mapping or through the XPath Formula Builder).

Once the variable’s contents have been supplied, the variable (in the Scope Variables area) can be mapped to any item.

Adding a variable is useful when you wish to join two repeating elements into a single list, then map the combined list to an item. Adding a variable is also useful if you perform the same computation repeatedly. You can map the results of the computation to several items instead of recreating the computation for each item.

Variables can also improve performance of mappings for large data structures. For example, if you have a process variable with 40 sub-elements, and you map each of the sub-elements to a corresponding input item, TIBCO BusinessEvents must retrieve the current process variable for each XPath expression, in this case 40 times. If this mapping appears in a loop, the retrieval of the current process variable occurs 40 times per iteration of the loop. With a variable, the data is retrieved only once and used for all mappings containing the variable. Therefore, to improve performance, create a local variable to hold process variables with a large number of elements and use the local variable in XPath expressions instead of the process variable.

## XSLT Equivalent

    <ns0:variable xmlns:ns0="http://www.w3.org/1999/XSL/Transform" name="var" select="$RetrieveResults/resultSet"/>

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TIBCO BusinessEvents® Enterprise Edition

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