Compile the sample validate validation hook by executing ant (see
samples/check_links/. The build creates
checklinks.jar. Then test the validation hook by proceeding as follows:
<include location="checklinks.incl" />
(which is equivalent to clearing the Quick Start cache in ).
samples/tests/in/sample2.html int XXE and examine all the problems found by the validation hook for this file (click on the tool tab to display the semantic warnings).