Create input, condition, and output expressions in the XPath expression editor. XPath is a query language that performs computations and arithmetic calculations on hierarchical elements.
You can use XPath expressions to define the context for a statement or to define conditions to transform and filter the data. The function library in the expression editor is standard for the W3C XML Path Language.
When you click the
Expression Editor
button in the input, condition, or output property of a statement, the expression editor appears. The following image shows the expression editor:
Add functions, source elements, or target elements to
the expression.
Edit the expression.
Validate the expression.
Undo and redo edits to the expression.
You can add functions, source elements, and target elements to the expression by clicking
Add
next to the function or element that you want to use. You
can also type in the expression manually. To validate the expression, click
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