<xs:element name="graph" type="graph.type" block="#all">
    <xs:annotation>
        <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
          Description: Describes one graph in this document.
          Occurence: &lt;graphml&gt;, &lt;node&gt;, &lt;edge&gt;, &lt;hyperedge&gt;.
      </xs:documentation>
    </xs:annotation>
    <xs:unique name="graph_data_key_unique">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: uniqueness of the key attributes of &lt;data&gt; children
                 of this &lt;graph&gt; element.
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath="./g:data" />
        <xs:field xpath="@key" />
    </xs:unique>
    <xs:key name="node_id_key">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: existence and uniqueness of the id attributes of 
                 each &lt;node&gt; element in this graph.
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:node" />
        <xs:field xpath="@id" />
    </xs:key>
    <xs:unique name="edge_id_unique">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: uniqueness of the id attributes of 
                 each &lt;edge&gt; element in this graph.
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:edge" />
        <xs:field xpath="@id" />
    </xs:unique>
    <xs:unique name="hyperedge_id_unique">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: uniqueness of the id attributes of 
                 each &lt;hyperedge&gt; element in this graph.
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:hyperedge" />
        <xs:field xpath="@id" />
    </xs:unique>
    <xs:unique name="endpoint_id_unique">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: uniqueness of the id attributes of 
                 each &lt;endpoint&gt; element in this graph.
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:endpoint" />
        <xs:field xpath="@id" />
    </xs:unique>
    <xs:keyref name="edge_source_ref" refer="node_id_key">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: for the source attribute of each &lt;edge&gt; in this graph, 
                 the existence of an id attribute of 
                 &lt;node&gt; which matches the value of it. 
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:edge" />
        <xs:field xpath="@source" />
    </xs:keyref>
    <xs:keyref name="edge_target_ref" refer="node_id_key">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: for the target attribute of each &lt;edge&gt; in this graph, 
                 the existence of an id attribute of 
                 &lt;node&gt; which matches the value of it. 
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:edge" />
        <xs:field xpath="@target" />
    </xs:keyref>
    <xs:keyref name="endpoint_node_ref" refer="node_id_key">
        <xs:annotation>
            <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
        Ensures: for the node attribute of each &lt;endpoint&gt; in this graph,
                 the existence of an id attribute of 
                 &lt;node&gt; which matches the value of it. 
      </xs:documentation>
        </xs:annotation>
        <xs:selector xpath=".//g:endpoint" />
        <xs:field xpath="@node" />
    </xs:keyref>
</xs:element>

• g:graph.type
  • graph