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      <h1>Unary plus and minus</h1>
      <p>The unary minus operator changes the sign of a number. For example <code>-1</code> is minus one, and
<code>-0e0</code> is the double value negative zero.</p>
      <p>Unary plus has very little effect: the value of <code>+1</code> is the same as the value of <code>1</code>.
It does, however, provide a quick way of forcing untyped values to be numeric, for example you can write
<code>&lt;xsl:sort select="+@price"/&gt;</code> to force a numeric sort, if you find 
<code>&lt;xsl:sort select="number(@price)"/&gt;</code> too verbose for your tastes.</p>
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