The URN of the form urn:jsptagdir ath must start with /WEB-INF/tags/ and identifies tag extensions (implemented as tag files) installed in the WEB-INF/tags/ directory or a subdirectory of it:
xmlns:u="urn:jsptagdir:/WEB-INF/tags/mytaglibs/"
Good night. Drive safely. Here's a tiny ad for the road:
a bit of art, as a gift, that will fit in a stocking