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Tag file

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I want to speak a little about these "strange" tag file.
1 ) from JSP.8.1 of JSP 2.0

As is the case with
JSP files, the actual tag may be composed of a top file that includes other files that
contain either a complete tag or a segment of a tag file. Just as the recommended
extension for a segment of a JSP file is .jspf, the recommended extension for a
segment of a tag file is .tagf.

Does it really mean that I can't call a tag file from an other tag file ?
I've tried to in Tomcat 5.0 but get an error.
When I include a jsp file that calls the tag file it works like it seems to be said in specs.
Is it really the good manner to proceed ?
I thought that I could call a tag file from an other one.
2) from Tomcat 5.0, I think there is a bug about fragment in tag file :
When you declare an attribute fragment not required, and that the calling page doesn't create the attribute, and that the tag file has a jsp:invoke for this fragment, it fires a NullPointerException. But the spec says

If the fragment identified by the given name is null,
<jsp:invoke> will behave as though a fragment was passed in that produces no

Have you met the same problem?
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