THE XML REVOLUTION - TECHNOLOGIES FOR THE FUTURE WEB

Expressions

Available types:

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.