<?xml version=“1.0” encoding=“utf-8”?> <xs:schema

  attributeFormDefault="unqualified"
  elementFormDefault="qualified"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="stringNotNull">
  <xs:restriction base="xs:token">
    <xs:minLength value="1" />
    <xs:maxLength value="2000" />
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="nonNegativeDecimal">
  <xs:restriction base="xs:decimal">
    <xs:minInclusive value="0" />
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="url">
  <xs:restriction base="xs:anyURI">
    <xs:pattern value="(https?|ftp)://(-\.)?([^\s/?\.#-]+\.?)+(/[^\s]*)?" />
  </xs:restriction>
</xs:simpleType>

</xs:schema>