Appendix C. Deployment Descriptor DTD Reference
A Document Type Definition
(DTD) file dictates
what is valid content within an XML file. This appendix provides the
official DTD for the Servlet API 2.2 web application deployment
descriptor. DTD files are not XML, but the syntax is easy to follow:
each <!ELEMENT> tag defines in parentheses
which child elements it may have, how many of each child it may have,
and in what order. A question mark (?) after a
child’s name means the child is optional (0 -
1), an asterisk (*) means the child may
appear any number of times (0 - n), a plus sign
(+) means some number of children must appear
(1 - n), and no following character means the
child is simply required (1). The syntax
(x|y) means either x or
y. The children of an element must follow the
exact order listed within the parentheses.
Figures Figure C-1 through Figure C-4 graphically demonstrate the element
structure; Example C-1 shows the DTD itself. Each
<!ATTLIST> tag controls the allowed
attributes for an element. In this DTD, the tag is used only to
provide default id values. The rest of this
appendix is reference material for the elements in the DTD.
Figure C-1. The element structure of the deployment descriptor DTD
Figure C-2.
Figure C-3.
Figure C-4.
Example C-1. The Deployment Descriptor ...
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