er a value
is within a given range. This could be used with any <code><a
href="refR.html#+relation">+relation</a></code> type, but typically it will be
used for numeric (<code><a href="refN.html#+Number">+Number</a></code>) or time
( <code><a href="refD.html#+Date">+Date</a></code> and <code><a
href="refT.html#+Time">+Time</a></code>) relations.

<p>Other predicates make only sense in the context of a certain <code><a
href="refR.html#+relation">+relation</a></code> type:

<ul>
<li><code><a href="refH.html#h