Is JAXP 1.3 compatible with Java version 1.3?
For example, if compiling file with javac -source 1.3 -target 1.3 (in which JAXP 1.3 was used) does the class file run in Java version 1.3 or earlier version.
Yes. Refer to the introduction in JAXP 1.3. You would need to copy the Jaxp jars to /lib/endorsed directory or use the system property: java.endorsed.dirs.
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