class XmlExamples {
  static def CAR_RECORDS = '''
    <records>
      <car name='HSV Maloo' make='Holden' year='2006'>
        <country>Australia</country>
        <record type='speed'>Production Pickup Truck with speed of 271kph</record>
      </car>
      <car name='P50' make='Peel' year='1962'>
        <country>Isle of Man</country>
        <record type='size'>Smallest Street-Legal Car at 99cm wide and 59 kg in weight</record>
      </car>
      <car name='Royale' make='Bugatti' year='1931'>
        <country>France</country>
        <record type='price'>Most Valuable Car at $15 million</record>
      </car>
    </records>
  '''
}

def xsd = '''
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
  <xs:element name="records">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" ref="car"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="car">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="country"/>
        <xs:element ref="record"/>
      </xs:sequence>
      <xs:attribute name="make" use="required" type="xs:NCName"/>
      <xs:attribute name="name" use="required"/>
      <xs:attribute name="year" use="required" type="xs:integer"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="country" type="xs:string"/>
  <xs:element name="record">
    <xs:complexType mixed="true">
      <xs:attribute name="type" use="required" type="xs:NCName"/>
    </xs:complexType>
  </xs:element>
</xs:schema>
'''.trim()

import javax.xml.XMLConstants
import javax.xml.transform.stream.StreamSource
import javax.xml.validation.SchemaFactory

def factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI)
def schema = factory.newSchema(new StreamSource(new StringReader(xsd)))
def validator = schema.newValidator()
validator.validate(new StreamSource(new StringReader(XmlExamples.CAR_RECORDS)))