A.xml

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="A" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="A">
    <xs:complexType>
      <xs:annotation>
        <xs:documentation>Квитанция УТМ</xs:documentation>
      </xs:annotation>
      <xs:sequence>
        <xs:element name="url" type="URL" minOccurs="1" maxOccurs="1"/>
        <xs:element name="sign" type="SIGN" minOccurs="1" maxOccurs="1"/>
        <xs:element name="ver" type="xs:integer" minOccurs="1" maxOccurs="1"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:simpleType name="URL">
    <xs:restriction base="xs:string">
      <xs:pattern value="(http:\/\/check\.egais\.ru\?id=)?([0-9a-f]{4}-?){8}(&dt=[0-9]{10}&cn=[0-9]{12})?"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="SIGN">
    <xs:restriction base="xs:string">
      <xs:pattern value="[0-9A-F]{128}"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>