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Returns a true value if an XML structure stored in a Blob variable contains the element on which the view is defined.
The XML view must include one 'main' complex and/or repeatable and/or recursive element.
When loading an XML view, the task's data view contains records of that 'main' element.
This function completes XML views by providing a way to avoid calling a task to process a certain XML view, if the XML (Blob variable) that the task assigns for a data source does not contain any records belonging to that XML view.
You can improve your programs' performance by using this function as an efficient stop condition when processing recursive XML views.
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