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Persistence descriptor elements 153 10.3 Persistence descriptor elements We will now consider the tags which are defined in the persistence descriptor DTD, and which are used in order to specify the persistence characteristics of persistence-capable classes. 10.3.1 The element occurs at various places throughout the DTD. It is a placeholder facilitating the introduction of vendor-specific extensions into persistence descriptors whilst retaining conformance to the standard DTD. It has three attributes: vendor-name, key, and value. This element will be illustrated at the end of the chapter. 10.3.2 jdo.dtd (extract) This is the root element of the document and must be present. It has no attributes. It must contain at least one
element, and may contain more than one. It may also contain zero, or more elements. 10.3.3
jdo.dtd (extract) This element identifies a package from which some classes will be enhanced. It has one attribute, the name of the package, which must be fully qualified, as in the example below: The
element must contain one or more elements. It may also contain zero or more elements.
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