<templinsertexcept> is defined in the WebLayout Templates module.
The <tmplinsertexcept> works like the
<tmplinsertall> tag, but you can specify some tags that are
not to be inserted. It is also possible to use
<tmplinsertexcept> within a <tmplblock> container
tag, in which case it will insert all tags from the current tag rather
than from the whole content file.