有人知道如何用php，DomDocument和DomXpath查询Graphml文档吗？我的查询似乎是正确的。例如//graphml/graph/node
$dom = new DomDocument();
$dom->load("doc.graphml");
$x = new DOMXPath($dom);
$x->registerNamespace('y', "http://www.yworks.com/xml/graphml");
$r = $x->query("//graphml/graph/node");
echo $r->length;
返回的长度始终为 0;但它必须是 1。
.XML：
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:y="http://www.yworks.com/xml/graphml"
xmlns:yed="http://www.yworks.com/xml/yed/3"
xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://www.yworks.com/xml/schema/graphml/1.1/ygraphml.xsd">
<!--Created by yFiles for Java 2.8-->
<key for="graphml" id="d0" yfiles.type="resources"/>
<key for="port" id="d1" yfiles.type="portgraphics"/>
<key for="port" id="d2" yfiles.type="portgeometry"/>
<key for="port" id="d3" yfiles.type="portuserdata"/>
<key attr.name="url" attr.type="string" for="node" id="d4"/>
<key attr.name="description" attr.type="string" for="node" id="d5"/>
<key for="node" id="d6" yfiles.type="nodegraphics"/>
<key attr.name="Beschreibung" attr.type="string" for="graph" id="d7">
<default/>
</key>
<key attr.name="url" attr.type="string" for="edge" id="d8"/>
<key attr.name="description" attr.type="string" for="edge" id="d9"/>
<key for="edge" id="d10" yfiles.type="edgegraphics"/>
<graph edgedefault="directed" id="G">
<node id="n0">
<data key="d4"><![CDATA[http://www.vilauma.de/]]></data>
<data key="d6">
<y:ShapeNode>
<y:Geometry height="30.0" width="30.0" x="785.0" y="-15.0"/>
<y:Fill color="#FFCC00" transparent="false"/>
<y:BorderStyle color="#000000" type="line" width="1.0"/>
<y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.701171875" modelName="internal" modelPosition="c" textColor="#000000" visible="true" width="45.349609375" x="-7.6748046875" y="5.6494140625">vilauma</y:NodeLabel>
<y:Shape type="roundrectangle"/>
</y:ShapeNode>
</data>
</node>
</graph>
</graphml>
解决了我的问题！
$dom = new DomDocument();
$dom->load("doc.graphml");
$x = new DOMXPath($dom);
$x->registerNamespace("graphml", "http://graphml.graphdrawing.org/xmlns");
$r = $x->query("//graphml:node");
echo $r->length; // result => 1