> <a href="Attributes/index.html">Attributes</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>Variables have unique integer ids but two variables can have the same name. Additional information can be added via variable attributes. For example, a variable can be a Terminal or a NonTerminal in the context of a pattern matching recursion scheme.</p></div></div><div class="odoc-spec"><div class="spec type" id="type-variable" cla