It depends on whether you're using the DTD or the XML Schema when applying a schema to your deployment descriptor. In DTDs, the order of elements is important, but in Schemas this is less strict (provided sub-elements appear in the right places etc.).
You'll know which you're using because you'll have used a DOCTYPE declaration if you're using a DTD, and some xsl: namespace attributes on the root element if you're using an XML Schema.
XML Schemas are much more flexible and therefore are replacing DTDs, and as a result, all Server 2.4+ specifications incorporate a Schema in preference to the DTD (however, there is still a DTD available for 2.4).
Charles Lyons (SCJP 1.4, April 2003; SCJP 5, Dec 2006; SCWCD 1.4b, April 2004)
Author of OCEJWCD Study Companion for Oracle Exam 1Z0-899 (ISBN 0955160340 / AmazonAmazon UK )
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