<xsd:element name="url">
    <xsd:annotation>
        <xsd:documentation>
      Container for the data needed to describe a document to crawl.
    </xsd:documentation>
    </xsd:annotation>
    <xsd:complexType>
        <xsd:all>
            <xsd:element ref="loc" />
            <xsd:element minOccurs="0" ref="lastmod" />
            <xsd:element minOccurs="0" ref="changefreq" />
            <xsd:element minOccurs="0" ref="priority" />
        </xsd:all>
    </xsd:complexType>
</xsd:element>