Google Gadget XSD doesn't pass XSD validation

If you are having trouble getting your development tools to work smoothly with gadget XSD to do tasks such as validating & parsing gadget xmls, then look no further. The problem lies in gadget XSD itself. The latest and greatest version 0.8 of the gadget is not a valid XSD.

Proof: Run it through W3C XSD validator and you will find close to 12 errors.

Here is the fixed XSD. Let me know if this works for you.

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Module">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="ModulePrefs" minOccurs="0">
          <xs:complexType>
            <xs:choice minOccurs="0" maxOccurs="unbounded">
              <xs:element name="Require" type="GadgetFeatureType"/>
              <xs:element name="Optional" type="GadgetFeatureType"/>
              <xs:element name="Preload">
                <xs:complexType>
                  <xs:attribute name="href" type="xs:string" use="required"/>
                  <xs:attribute name="authz" default="none">
                     <xs:simpleType>
                      <xs:restriction base="xs:string">
                        <xs:enumeration value="none"/>
                        <xs:enumeration value="signed"/>
                        <xs:enumeration value="oauth"/>
                      </xs:restriction>
                    </xs:simpleType>
                  </xs:attribute>
                  <xs:attribute name="sign_owner" type="xs:boolean" default="true"/>
                  <xs:attribute name="sign_viewer" type="xs:boolean" default="true"/>
                  <xs:attribute name="views" type="xs:string" use="optional"/>
                </xs:complexType>
              </xs:element>
              <xs:element name="Icon">
                <xs:complexType>
                  <xs:simpleContent>
                    <xs:extension base="xs:string">
                      <xs:attribute name="mode">
                        <xs:simpleType>
                          <xs:restriction base="xs:string">
                            <xs:enumeration value="base64"/>
                          </xs:restriction>
                        </xs:simpleType>
                      </xs:attribute>
                      <xs:attribute name="type" type="xs:string"/>
                    </xs:extension>
                  </xs:simpleContent>
                </xs:complexType>
              </xs:element>
              <xs:element name="Locale">
                <xs:complexType>
          <xs:sequence>
            <xs:element name="msg" minOccurs="0" maxOccurs="unbounded">
            <xs:complexType>
              <xs:simpleContent>
              <xs:extension base="xs:string">
                <xs:attribute name="name" type="xs:string" use="required"/>
                <xs:attribute name="desc" type="xs:string" use="optional"/>
              </xs:extension>
              </xs:simpleContent>
            </xs:complexType>
            </xs:element>
          </xs:sequence>
                  <xs:attribute name="lang" type="xs:string" use="optional"/>
                  <xs:attribute name="country" type="xs:string" use="optional"/>
                  <xs:attribute name="messages" type="xs:string" use="optional"/>
                  <xs:attribute name="language_direction">
                    <xs:simpleType>
                      <xs:restriction base="xs:string">
                        <xs:enumeration value="ltr"/>
                        <xs:enumeration value="rtl"/>
                      </xs:restriction>
                    </xs:simpleType>
                  </xs:attribute>
                </xs:complexType>
              </xs:element>
              <xs:element name="Link">
                <xs:complexType>
                  <xs:attribute name="href" type="xs:string" use="required"/>
                  <xs:attribute name="rel" use="required">
                    <xs:simpleType>
                      <xs:restriction base="xs:string">
                        <xs:enumeration value="gadgets.help"/>
                        <xs:enumeration value="gadgets.support"/>
                        <xs:enumeration value="icon"/>
                      </xs:restriction>
                    </xs:simpleType>
                  </xs:attribute>
                </xs:complexType>
              </xs:element>
              <xs:element name="OAuth" minOccurs="0" maxOccurs="1">
                <xs:complexType>
          <xs:sequence>
            <xs:element name="Service" maxOccurs="unbounded">
            <xs:complexType>
            <xs:sequence>
              <xs:element name="Request" type="OAuthResourceType" minOccurs="0"/>
              <xs:element name="Access" type="OAuthResourceType" minOccurs="0"/>
              <xs:element name="Authorization" minOccurs="0">
              <xs:complexType>
                <xs:attribute name="url" type="xs:string" use="required"/>

              </xs:complexType>
              </xs:element>
              </xs:sequence>
            </xs:complexType>
            </xs:element>
            </xs:sequence>
                  <xs:attribute name="name" type="xs:string" use="optional"/>
                </xs:complexType>
              </xs:element>
            </xs:choice>
            <xs:attribute name="title" type="xs:string" use="optional"/>
            <xs:attribute name="title_url" type="xs:string" use="optional"/>
            <xs:attribute name="description" type="xs:string" use="optional"/>
            <xs:attribute name="author" type="xs:string" use="optional"/>
            <xs:attribute name="author_email" type="xs:string" use="optional"/>
            <xs:attribute name="screenshot" type="xs:string" use="optional"/>
            <xs:attribute name="thumbnail" type="xs:string" use="optional"/>
            <xs:attribute name="directory_title" type="xs:string" use="optional"/>
            <xs:attribute name="author_affiliation" type="xs:string" use="optional"/>
            <xs:attribute name="author_location" type="xs:string" use="optional"/>
            <xs:attribute name="author_photo" type="xs:string" use="optional"/>
            <xs:attribute name="author_aboutme" type="xs:string" use="optional"/>
            <xs:attribute name="author_quote" type="xs:string" use="optional"/>
            <xs:attribute name="author_link" type="xs:string" use="optional"/>
            <xs:attribute name="show_stats" type="xs:boolean" use="optional"/>
            <xs:attribute name="show_in_directory" type="xs:boolean" use="optional"/>
            <xs:attribute name="string" type="xs:string" use="optional"/>
            <xs:attribute name="width" type="xs:int" use="optional"/>
            <xs:attribute name="height" type="xs:int" use="optional"/>
            <xs:attribute name="category" type="xs:string" use="optional"/>
            <xs:attribute name="category2" type="xs:string" use="optional"/>
            <xs:attribute name="singleton" type="xs:boolean" use="optional"/>
            <xs:attribute name="render_inline" type="xs:string" use="optional"/>
            <xs:attribute name="scaling" type="xs:boolean" use="optional"/>
            <xs:attribute name="scrolling" type="xs:boolean" use="optional"/>
          </xs:complexType>
        </xs:element>
        <xs:element name="UserPref" minOccurs="0" maxOccurs="unbounded">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="EnumValue" minOccurs="0" maxOccurs="unbounded">
                <xs:complexType>
                  <xs:attribute name="value" type="xs:string" use="required"/>
                  <xs:attribute name="display_value" type="xs:string" use="optional"/>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
            <xs:attribute name="name" type="xs:string" use="required"/>
            <xs:attribute name="display_name" type="xs:string" use="optional"/>
            <xs:attribute name="default_value" type="xs:string" use="optional"/>
            <xs:attribute name="required" type="xs:string" use="optional"/>
            <xs:attribute name="datatype" default="string">
              <xs:simpleType>
                <xs:restriction base="xs:string">
                  <xs:enumeration value="string"/>
                  <xs:enumeration value="hidden"/>
                  <xs:enumeration value="bool"/>
                  <xs:enumeration value="enum"/>
                  <xs:enumeration value="list"/>
                  <xs:enumeration value="number"/>
                  <xs:enumeration value="location"/>
                </xs:restriction>
              </xs:simpleType>
            </xs:attribute>
            <xs:attribute name="urlparam" type="xs:string" use="optional"/>
            <xs:attribute name="autocomplete_url" type="xs:string" use="optional"/>
            <xs:attribute name="num_minval" type="xs:double" use="optional"/>
            <xs:attribute name="num_maxval" type="xs:double" use="optional"/>
            <xs:attribute name="str_maxlen" type="xs:int" use="optional"/>
            <xs:attribute name="restrict_to_completions" type="xs:boolean" use="optional"/>
            <xs:attribute name="prefix_match" type="xs:boolean" use="optional"/>
            <xs:attribute name="publish" type="xs:boolean" use="optional"/>
            <xs:attribute name="listen" type="xs:boolean" use="optional"/>
            <xs:attribute name="on_change" type="xs:string" use="optional"/>
            <xs:attribute name="group" type="xs:string" use="optional"/>
          </xs:complexType>
        </xs:element>
        <xs:element name="Content" minOccurs="1" maxOccurs="unbounded">
          <xs:complexType>
            <xs:simpleContent>
              <xs:extension base="xs:string">
                <xs:attribute name="type" use="optional" default="html">
                  <xs:simpleType>
                    <xs:restriction base="xs:string">
                      <xs:enumeration value="html"/>
                      <xs:enumeration value="url"/>
                      <xs:enumeration value="html-inline"/>
                    </xs:restriction>
                  </xs:simpleType>
                </xs:attribute>
                <xs:attribute name="href" type="xs:string" use="optional"/>
                <xs:attribute name="view" type="xs:string" use="optional"/>
                <xs:attribute name="preferred_height" type="xs:integer" use="optional"/>
                <xs:attribute name="preferred_width" type="xs:integer" use="optional"/>
              </xs:extension>
            </xs:simpleContent>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="GadgetFeatureType">
    <xs:sequence>
      <xs:element name="Param" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:simpleContent>
            <xs:extension base="xs:string">
              <xs:attribute name="name" type="xs:string" use="required"/>
            </xs:extension>
          </xs:simpleContent>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attribute name="feature" type="xs:string" use="required"/>
  </xs:complexType>
  <xs:complexType name="OAuthResourceType">
    <xs:attribute name="url" type="xs:string" use="required"/>
    <xs:attribute name="method" use="optional" default="GET">
  <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value="GET"/>
        <xs:enumeration value="POST"/>
      </xs:restriction>
    </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="param_location" use="optional" default="header">
  <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value="header"/>
        <xs:enumeration value="url"/>
        <xs:enumeration value="body"/>
      </xs:restriction>
    </xs:simpleType>
    </xs:attribute>
  </xs:complexType>
</xs:schema>