source: stylesheets/lfs-xsl/docbook-xsl-1.78.1/slides/schema/xsd/xml.xsd@ c158fe6

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns:dbs="http://docbook.org/ns/docbook-slides" xmlns:db="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <xs:import namespace="http://docbook.org/ns/docbook" schemaLocation="db.xsd"/>
  <xs:import namespace="http://docbook.org/ns/docbook-slides" schemaLocation="slides.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="xlink.xsd"/>
  <xs:attribute name="id" type="xs:ID"/>
  <xs:attribute name="lang"/>
  <xs:attribute name="base" type="xs:anyURI"/>
  <xs:attributeGroup name="space">
    <xs:attribute name="space" use="required" form="qualified">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="preserve">
            <xs:annotation>
              <xs:documentation>Whitespace must be preserved.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
  </xs:attributeGroup>
  <xs:attributeGroup name="space1">
    <xs:attribute name="space" use="required" form="qualified">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="preserve">
            <xs:annotation>
              <xs:documentation>Extra whitespace and line breaks must be preserved.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
  </xs:attributeGroup>
</xs:schema>