Extracts all nodes from a sequence, preserving document order and removing duplicates.
This is used when a sequence must be treated as a node-set in XPath 1.0 mode.
The sequence or single value
Array of unique nodes in document order, or empty array
Extracts all nodes from a sequence, preserving document order and removing duplicates.
This is used when a sequence must be treated as a node-set in XPath 1.0 mode.