XML Query Data Model

Nodes
Node = DocNode | ElemNode | AttrNode | ValueNode | NSNode | PINode | CommentNode | InfoItemNode
XML Schema primitive types
string, boolean, ID, IDREF, decimal, QName, ...
Collections
list set bag disjoint union tuple
[T] {T} {|T|} T1 | T2 (T1,…,Tn)
References
ref(T)