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https://issues.apache.org/jira/browse/XERCESJ-150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18003482#comment-18003482
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Elliotte Rusty Harold commented on XERCESJ-150:
-----------------------------------------------
Cods is busted by design:
{{ /**
* Comments and PIs cannot be serialized before the root element,
* because the root element serializes the document type, which
* generally comes first. Instead, such PIs and comments are
* accumulated inside a vector and serialized by calling this
* method. Will be called when the root element is serialized
* and when the document finished serializing.}}
This should be fixed
> Processing instruction cannot precede doctype
> ---------------------------------------------
>
> Key: XERCESJ-150
> URL: https://issues.apache.org/jira/browse/XERCESJ-150
> Project: Xerces2-J
> Issue Type: Bug
> Components: Serialization
> Affects Versions: 2.0.0
> Environment: Operating System: Other
> Platform: Other
> Reporter: Paul Prescod
>
> Given:
> {noformat}
> public static void main(String []args) throws SAXException{
> XMLSerializer serializer = new XMLSerializer();
> serializer.setOutputByteStream(System.out);
> serializer.startDocument();
> serializer.processingInstruction("foo", "bar");
> serializer.startDTD("foo", "bar", "baz");
> serializer.startElement("foo", "bar", "bar", null);
> serializer.endElement("foo", "bar", "bar");
> serializer.endDocument();
> }
> {noformat}
> Xerces goes to a great deal of effort to make the processing instruction
> appear
> AFTER the doctype (serializePreRoot etc.). But why is this so? It is
> perfectly
> legal in XML for a processing instruction to proceed the doctype!
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