From Educational Exercises and Activities Community Group
<graph id="graph1">
<head>
<data type="application/rdf+xml">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<!-- can describe nodes, edges, graphs and subgraphs (e.g. #region2) including subgraphs which are nested or overlapping -->
<rdf:Description rdf:about="#region2"><!-- ... --></rdf:Description>
</rdf:RDF>
</data>
</head>
<body>
<region id="region1" />
<region id="region2" />
<node id="node1" of="#region1 #region2">
<edge id="edge1" to="#node2" of="#region1 #region2" />
<edge id="edge2" to="#node3" of="#region1" />
</node>
<node id="node2" of="#region1 #region2" />
<node id="node3" of="#region1">
<edge id="edge3" to="#node4" of="#region1" />
</node>
<node id="node4" of="#region1" />
</body>
</graph>
<graph id="graph1">
<head>
<data type="application/ld+json">
{
"@id": "#region2",
...
}
</data>
</head>
<body>
<region id="region1" />
<region id="region2" />
<node id="node1" of="#region1 #region2">
<edge id="edge1" to="#node2" of="#region1 #region2" />
<edge id="edge2" to="#node3" of="#region1" />
</node>
<node id="node2" of="#region1 #region2" />
<node id="node3" of="#region1">
<edge id="edge3" to="#node4" of="#region1" />
</node>
<node id="node4" of="#region1" />
</body>
</graph>
