elharo opened a new pull request, #133:
URL: https://github.com/apache/xerces-j/pull/133

   Fixes https://issues.apache.org/jira/browse/XERCESJ-150
   
   ## Problem
   
   `XMLSerializer` accumulates comments and processing instructions that occur 
before the root element and emits them after the DOCTYPE. XML permits these to 
appear before the DOCTYPE, and their position should be preserved.
   
   For example, this sequence:
   
   ```java
   serializer.startDocument();
   serializer.processingInstruction("foo", "bar");
   serializer.startDTD("foo", "bar", "baz");
   ```
   
   previously placed `<?foo bar?>` after `<!DOCTYPE ...>`. It is now emitted 
before the DOCTYPE. The same issue affected comments and DOM-based 
serialization.
   
   ## Fix
   
   - Track how many pre-root comments/PIs were seen before the DOCTYPE (via 
`startDTD` and the DOM `DocumentType` node).
   - Emit that prefix before the DOCTYPE in `XMLSerializer` and 
`HTMLSerializer`, then emit the remainder afterwards.
   - Process `DocumentType` nodes in document order when serializing a DOM 
`Document`, so comments/PIs before the doctype are distinguished from those 
after it.
   
   ## Tests
   
   Added `dom.serialize.TestPreRootSerialization`, covering both the SAX and 
DOM serialization paths. Four of its eight tests fail on the unmodified tree 
and all pass with this change. `ant test` passes.


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