<?xml version="1.0" encoding="utf-16"?>
<xs:attribute name="type" default="simple">
    <xs:simpleType>
        <xs:restriction base="xs:string">
            <xs:enumeration value="simple" />
            <xs:enumeration value="extended" />
            <xs:enumeration value="locator" />
            <xs:enumeration value="arc" />
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>