There is one open-source xerces-related file with missing copyright header
jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/xinclude/XPointerSchema.java
I���m trying to trace the origin of this file and initially I thought that it���s a part of Apache Xerces but apparently no
There is no such file in Apache repo
http://svn.apache.org/viewvc/xerces/java/trunk/src/org/apache/xerces/xinclude/
and I didn���t find any revision that removes this file.
It seems like this file and other two files are OpenJDK-specific files and these files aren���t used
jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/xinclude/XPointerSchema.java
jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/xinclude/XPointerFramework.java
jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/xinclude/XPointerElementHandler.java
My understanding is that initially support for XPointer was missing in Apache Xerces and Sun implemented support for XPointer. But now Apache Xerces supports XPointer and these files are no longer used.