Implicit Semantics

• Supports variability in XML data
• Replication, absence of XML values
• Demands flexible, implicit semantics
• Selection

//show[year >= 2000]

• Explicit XPath 2.0 expression:

//show[some $v in ./child::year satisfies data($v) ge 2000]

Existential quantification, extraction of typed atomic value

• Existence/absence of value

//show/reviewer[following-sibling::rating]

• Explicit XPath 2.0 expression:

//show/reviewer[not(empty(./following-sibling::rating))]

Application of functions