<?xml version="1.0" encoding="utf-16"?>
<xs:element name="port" type="port.type" block="#all">
<xs:annotation>
<xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
Description: Nodes may be structured by ports; thus edges
are not only attached to a node but to a certain
port in this node.
Occurence: <node>, <port>.
</xs:documentation>
</xs:annotation>
<xs:unique name="port_data_key_unique">
<xs:annotation>
<xs:documentation source="http://graphml.graphdrawing.org/" xml:lang="en">
Ensures: uniqueness of the key attributes of <data> children
of this <port> element.
</xs:documentation>
</xs:annotation>
<xs:selector xpath="./g:data" />
<xs:field xpath="@key" />
</xs:unique>
</xs:element>
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