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+Previous: <a href="Identifiers.html#Identifiers" accesskey="p" rel="previous">Identifiers</a>, Up: <a href="Tree-overview.html#Tree-overview" accesskey="u" rel="up">Tree overview</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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+<a name="Containers-1"></a>
+<h4 class="subsection">11.2.3 Containers</h4>
+<a name="index-container"></a>
+<a name="index-list"></a>
+<a name="index-vector"></a>
+<a name="index-TREE_005fLIST"></a>
+<a name="index-TREE_005fVEC"></a>
+<a name="index-TREE_005fPURPOSE"></a>
+<a name="index-TREE_005fVALUE"></a>
+<a name="index-TREE_005fVEC_005fLENGTH"></a>
+<a name="index-TREE_005fVEC_005fELT"></a>
+
+<p>Two common container data structures can be represented directly with
+tree nodes.  A <code>TREE_LIST</code> is a singly linked list containing two
+trees per node.  These are the <code>TREE_PURPOSE</code> and <code>TREE_VALUE</code>
+of each node.  (Often, the <code>TREE_PURPOSE</code> contains some kind of
+tag, or additional information, while the <code>TREE_VALUE</code> contains the
+majority of the payload.  In other cases, the <code>TREE_PURPOSE</code> is
+simply <code>NULL_TREE</code>, while in still others both the
+<code>TREE_PURPOSE</code> and <code>TREE_VALUE</code> are of equal stature.)  Given
+one <code>TREE_LIST</code> node, the next node is found by following the
+<code>TREE_CHAIN</code>.  If the <code>TREE_CHAIN</code> is <code>NULL_TREE</code>, then
+you have reached the end of the list.
+</p>
+<p>A <code>TREE_VEC</code> is a simple vector.  The <code>TREE_VEC_LENGTH</code> is an
+integer (not a tree) giving the number of nodes in the vector.  The
+nodes themselves are accessed using the <code>TREE_VEC_ELT</code> macro, which
+takes two arguments.  The first is the <code>TREE_VEC</code> in question; the
+second is an integer indicating which element in the vector is desired.
+The elements are indexed from zero.
+</p>
+
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