Creates an XML processing instruction node with the name determined by XML_PI_target.
A valid XML 1.1 NCName.
It should not be the string 'xml' in any upper or lower case combination. For example, 'xml', 'XML', and 'Xml' are not valid.
- A string used to construct the processing instruction node.
- RETURNING CONTENT
- The return value is an XQuery document node with the PI as its child.
- RETURNING SEQUENCE
- The return value is a sequence with the PI as its only item. This is the default.