Based on XPath 1.0

• Data model

• Path-like syntax

  • /html/head/title
  • html:head/xforms:model/@xml:id
  • ../items purchaseOrder/items/item[3]
  • purchaseOrder/items/item[@price = 12.34]
  • string-length('hello world')
  • purchOrder/subtotal * instance('taxtable')/tax

Notes: