<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.protogeni.net/resources/rspec/ext/gre-tunnel/1" xmlns:gre-tunnel="http://www.protogeni.net/resources/rspec/ext/gre-tunnel/1">
  <xs:element name="interface_ip">
    <xs:complexType>
      <xs:attribute name="address" use="required"/>
      <xs:attribute name="netmask" use="required"/>
    </xs:complexType>
  </xs:element>
</xs:schema>