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https://issues.apache.org/jira/browse/XALANJ-2560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13442369#comment-13442369
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Christopher Taylor edited comment on XALANJ-2560 at 8/27/12 11:09 PM:
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possible dupe of XALANJ-2419, also referenced in 
http://stackoverflow.com/questions/10511474/surrogate-pair-handling-in-xalan-2-7-1
                
      was (Author: ccmtaylor):
    possible dupe of XALANJ-2419
                  
> ToXMLStream does not support unicode supplementary characters
> -------------------------------------------------------------
>
>                 Key: XALANJ-2560
>                 URL: https://issues.apache.org/jira/browse/XALANJ-2560
>             Project: XalanJ2
>          Issue Type: Bug
>      Security Level: No security risk; visible to anyone(Ordinary problems in 
> Xalan projects.  Anybody can view the issue.) 
>          Components: Serialization
>    Affects Versions: 2.7.1
>         Environment: Xalan 2.7.1 serializer.
> Tested on Ubuntu 12.04 with Oracle JDK 1.7.0_05.
>            Reporter: Damien Guillaume
>              Labels: serialization, unicode
>
> org.apache.xml.serializer.ToXMLStream (which extends ToStream) does not 
> support serialization of unicode supplementary characters such as U+1D49C. It 
> creates invalid characters entities like "��" instead of 
> "𝒜" (or F0 9D 92 9C with UTF-8). ToXMLStream is used by LSSerializer 
> when Xalan's serializer is on the classpath.
> org.apache.xml.serialize.DOMSerializerImpl (included in Xerces) does not have 
> this problem, but it is deprecated since Xerces 2.9.0, so this is a 
> regression.
> See 
> http://stackoverflow.com/questions/11952289/serializing-supplementary-unicode-characters-into-xml-documents-with-java
>  for more details.

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