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Abstract syntax for expressions:
| exp | -> | $variable |
| | | ( exp ) | |
| | | literal | |
| | | numeral | |
| | | function ( arguments ) | |
| | | boolean-expression | |
| | | numerical-expression | |
| | | node-set-expression |
Coercion may occur at function arguments and when expressions are used as predicates.
Variables and functions are evaluated using the context.
Boolean, numerical, and node-set
expressions are described in the following...