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Expressions

Available types:
  • node-set (set of nodes)
  • boolean (true or false)
  • number (floating point)
  • string (Unicode text)

An expression can be:

  • a constant, e.g. "..."
  • a variable:   $variable
  • a function call:   function ( arguments )
  • a boolean expression:   or, and, =, !=, <, >, <=, >= (standard precedence, all left associative)
  • a numerical expression:   +, -, *, div, mod
  • a node-set expression (using location paths!):   | (set union)

Coercion may occur at function arguments and when expressions are used as predicates.

Variables and functions are evaluated using the context.

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