objects.xsd

<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <!-- definition of simple elements -->
  <xs:element name="NAME" type="xs:string"/>
  <xs:element name="VALUE">
      <xs:complexType>
      <xs:simpleContent>
        <xs:extension base="xs:string">
          <xs:attribute ref="type"/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>
  <xs:element name="REQUIRED" type="xs:boolean"/>
  <xs:element name="INDIRECT_REFERENCE" type="xs:boolean"/>
  <xs:element name="INTRODUCED">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value="1.0"/>
        <xs:enumeration value="1.1"/>
        <xs:enumeration value="1.2"/>
        <xs:enumeration value="1.3"/>
        <xs:enumeration value="1.4"/>
        <xs:enumeration value="1.5"/>
        <xs:enumeration value="1.6"/>
        <xs:enumeration value="1.7"/>
        <xs:enumeration value="2.0"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:element>
  <xs:element name="DEPRECATED" nillable="true">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value=""/>
        <xs:enumeration value="1.0"/>
        <xs:enumeration value="1.1"/>
        <xs:enumeration value="1.2"/>
        <xs:enumeration value="1.3"/>
        <xs:enumeration value="1.4"/>
        <xs:enumeration value="1.5"/>
        <xs:enumeration value="1.6"/>
        <xs:enumeration value="1.7"/>
        <xs:enumeration value="2.0"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:element>
  <xs:element name="SPECIAL_CASE" type="xs:string"/>

  <!-- definition of attributes -->
  <xs:attribute name="id" type="xs:string"/>
  <xs:attribute name="type">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value="integer"/>
        <xs:enumeration value="number"/>
        <xs:enumeration value="name"/>
        <xs:enumeration value="boolean"/>
        <xs:enumeration value="string"/>
        <xs:enumeration value="string-ascii"/>
        <xs:enumeration value="string-byte"/>
        <xs:enumeration value="string-text"/>
        <xs:enumeration value="stream"/>
        <xs:enumeration value="dictionary"/>
        <xs:enumeration value="array"/>
        <xs:enumeration value="rectangle"/>
        <xs:enumeration value="date"/>
        <xs:enumeration value="name-tree"/>
        <xs:enumeration value="number-tree"/>
        <xs:enumeration value="null"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attribute name="object_number" type="xs:integer"/>
  <xs:attribute name="grammar_version" type="xs:string"/>
  <xs:attribute name="iso_ref" type="xs:string"/>
  <xs:attribute name="pdf_version">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value=""/>
        <xs:enumeration value="1.0"/>
        <xs:enumeration value="1.1"/>
        <xs:enumeration value="1.2"/>
        <xs:enumeration value="1.3"/>
        <xs:enumeration value="1.4"/>
        <xs:enumeration value="1.5"/>
        <xs:enumeration value="1.6"/>
        <xs:enumeration value="1.7"/>
        <xs:enumeration value="2.0"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>

  <!-- definition of complex elements -->
  <xs:element name="PDF">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="OBJECT" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute ref="grammar_version"/>
      <xs:attribute ref="pdf_version"/>
      <xs:attribute ref="iso_ref"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="OBJECT">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="ENTRY" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute ref="id"/>
      <xs:attribute ref="object_number"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="ENTRY">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="NAME" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="VALUES" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="REQUIRED" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="INDIRECT_REFERENCE" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="INTRODUCED" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="DEPRECATED" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="SPECIAL_CASE" minOccurs="1" maxOccurs="1"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="VALUES">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="VALUE" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>