The JAXP package of Open-JDK as external package - supposed for backward compatibility use cases.
The package name will reflect the major JDK version and the minimum JDK code compatibility.
The version number will reflect the corresponding original JDK version.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window openjdk-jaxp-parent-1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
