Building simple XPath expressions

Build a simple expression when you must reference the data represented by a node in the process data tree. Simple expressions include a path to the data node.

You can also build expressions with nodes of XML variables that conform to an XSD that references XSD files.

In XPath expressions, the @ symbol precedes simple variable types, and is not present in the complex variable types. The following expression references the value stored in the string variable named stringVar : 

/process_data/@stringVar

The following expression references the value stored in the xml variable named xmlVar : 

/process_data/xmlVar

To build an expression that uses process variables:

  1. Navigate the process data tree to locate the item that you want to include in the expression.

  2. Choose either of these ways to add the item to the expression:

    • Select the item and click Insert Selection.

    • Double-click the item.

    Note: To build expressions that contain nodes of XML variables that conform to an XSD that references XSD files, drill down to the nodes as desired in the XPATH builder.
    For example, if you select the status node and click Insert Selection, the expression that identifies that node appears in the expression work area.
    Detail of XPath Builder dialog box
    A. Selected node B. Click to insert C. Inserted expression

  3. Repeat step 2 as required.

  4. When the expression is complete, click OK.

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