Boolean expressions
XPath supports standard and or boolean expressions. Each operand is evaluated and coerced to a boolean as if by calling the boolean function before evaluation. Returns true assuming there are at least child item elements under the root invoice element . Identifies the child item elements that have both sku and price child elements. item sku lt 100 or price gt 50.0 Identifies the child item elements that have either a price child element with a value less than 100 or a sku child element with a...