4. XPath
PB138
XPath
● //person
● descendant-or-self:person
● /descendant-or-self:person
● child::people/child::person
Shortcuts
● attribute:: -> @
● descendant-or-self -> //
find last element in third level of XML tree of the
document (nodetest *)
XPath predicates
● AXIS::NODETEST[predicate]
○ position()=1
○ position=last()
○ you can use or, and
● find full_address of Steven Segal
● find phones of Jirka Novák and Segal
● Find name of the Person living on street
'Uvoz 22'
Node sets and Union
● count(nodeset) counts number of nodes
● nodeset | nodeset creates union of nodesets
● count number of phone elements and person
elements together
● number of phones that contain number
sequence "77" use contains(string, string)