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<h1>Set difference and intersection</h1>
<p>These operators are new in XPath 2.0.</p>
<p>The expression <code>E1 except E2</code> selects all nodes that are in <code>E1</code> unless
they are also in <code>E2</code>. Both expressions must return sequences of nodes. The results
are returned in document order. For example, <code>@* except @note</code> returns all attributes
except the <code>note</code> attribute.</p>
<p>The expression <code>E1 intersect E2</code> selects all nodes that are in both <code>E1</code> and
<code>E2</code>. Both expressions must return sequences of nodes. The results
are returned in document order. For example, <code>preceding::fig intersect ancestor::chapter//fig</code>
returns all preceding <code>fig</code> elements within the current chapter.</p>
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