<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE organization [
    <!ELEMENT organization (company*,ids)>
    <!ELEMENT company (#PCDATA | department | equipment:instance)*>
    <!ELEMENT ids (id*)>
    <!ELEMENT id EMPTY>
    <!ELEMENT department EMPTY>
    <!ELEMENT equipment:instance EMPTY>

    <!ATTLIST organization  id              ID  #IMPLIED
                            xmlns:equipment CDATA  #FIXED "http://namespaces.tksoft.com/equipment/"
    >
    <!ATTLIST company   id                  ID  #REQUIRED
                        count               CDATA  #REQUIRED
    >
    <!ATTLIST department    id              ID  #REQUIRED
    >
    <!ATTLIST equipment:instance    id          ID  #REQUIRED
    >
    <!ATTLIST id
        value       IDREF   #REQUIRED
    >
]>
<organization>
    <company id="ca" count="2">
        <department id="da"/>
        <equipment:instance id="ea"/>
        <equipment:instance id="eb"/>
    </company>
    <company id="cb" count="0"/>
    <company id="cc" count="5"/>
    <ids>
        <id value="ca"/>
        <id value="cb"/>
    </ids>
</organization>