netbeans.apache.org/src/content/dtds/instance-1_0.dtd

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<!-- -//NetBeans//DTD Simple Instance 1.0//EN -->
<!-- Represents a simple instance of a class; -->
<!-- either a default instance or a serialized bean. -->
<!-- Can also be a holder for the class rather than an instance thereof. -->
<!ELEMENT instance       EMPTY>
<!ATTLIST instance
          class          CDATA        #REQUIRED
          serialdata     CDATA        #IMPLIED
          uninstantiated (true|false) "false"
>