diff  between the latest copies on the main branch and tck-jaxp-1_2_0
shows some other differences, most notably how the jaxp.properties file is
cached. The code on the main branch will read and cache the
jaxp.properties file once whereas on the tck-jaxp-1_2_0 branch it will
reload it if the jaxp.properties file was modified since it was read
(which to me appears to be a more desirable behaviour).