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<p>Get a node of a YAML document. </p>
<p>The pointer returned by this function is valid until any of the functions modifying the documents are called.</p>
<dl><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>document</em>&nbsp;</td><td>A document object. </td></tr>
    <tr><td valign="top"><tt>[in]</tt>&nbsp;</td><td valign="top"><em>in