Read XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition Online
Authors: Michael Kay
The syntax is quite complicated, so we'll take it in stages, explaining the semantics as we go along.
Expression | Syntax |
SequenceType | (ItemType OccurrenceIndicator?) | empty-sequence ( ) |
OccurrenceIndicator | ? | * | + |
ItemType | AtomicType | KindTest | item ( ) |