Description: In GraphML there may be data-functions attached
             to graphs, nodes, ports, edges, hyperedges and
             endpoint and to the whole collection of 
             graphs described by the content of <graphml>. 
             These functions are declared by <key> elements
             (children of <graphml>) and defined by <data>
             elements.
             The (optional) <default> child of <key> gives 
             the default value for the corresponding function. 
Occurence: <key>.

<?xml version="1.0" encoding="utf-16"?>
<xs:element name="default" type="default.type" block="#all">
    <xs:annotation>
        <xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
           Description: In GraphML there may be data-functions attached
                        to graphs, nodes, ports, edges, hyperedges and
                        endpoint and to the whole collection of 
                        graphs described by the content of &lt;graphml&gt;. 
                        These functions are declared by &lt;key&gt; elements
                        (children of &lt;graphml&gt;) and defined by &lt;data&gt;
                        elements.
                        The (optional) &lt;default&gt; child of &lt;key&gt; gives 
                        the default value for the corresponding function. 
           Occurence: &lt;key&gt;. 
      </xs:documentation>
    </xs:annotation>
</xs:element>

• g:data-extension.type
  • g:default.type
    • default