====== Expression ======

===== Definitions =====
==== expression ====
Each expression is equal to an equation which forms a rule for the calculation of a value. 

  * relation { and relation }
  * relation { or relation }
  * relation { xor relation }
  * relation [ nand relation ]
  * relation [ nor relation ]
  * relation { xnor relation }

==== relation ====
''shift_expression [ relational_operator shift_expression ]''

==== shift_expression ====
''simple_expression [ shift_operator simple_expression ]''

==== simple_expression ====
''[ [[.:bnf#sign]] ] term { [[.:bnf#adding_operator]] term }''

==== term ====
''factor { [[.:bnf#multiplying_operator]] factor }''

==== factor ====
<code vhdl>primary [ ** primary ]</code>
<code vhdl>abs primary</code>
<code vhdl>not primary</code>

==== primary ====
  * [[.:bnf#name]]
  * [[.:bnf#literal]]
  * [[.:bnf#aggregate]]
  * [[.:bnf#function_call]]
  * [[.:bnf#qualified_expression]]
  * [[.:bnf#type_conversion]]
  * [[.:bnf#allocator]]
  * ( [[.:bnf#expression]] )