Comment 2 for bug 1160897

Thanks so much for your reply, however, in the bug report I noted
{

Q.) "How does a package install the desktop file?"
A.) "Your search did not match any documents. Please make sure that all words are spelled correctly and that you've selected enough categories."

VERSUS
Q.) "desktop file install"
Search finished, found 3 page(s) matching the search query.

    Basic Overview of the debian/ Directory
    ...icy (Section 12.5) <http://www.debian.org/doc/debian-policy/ch-docs.html#s-copyrightfile>`_ require that each package installs a verbatim copy of its copyright and license information to ``/usr/share/doc/$(package_name)/copyright``. Gen...

    Fixing a bug in Ubuntu
    ...$ apt-cache showsrc python-vigra | grep ^Package: Package: libvigraimpex ``apt-cache`` is part of the standard installation of Ubuntu. Getting the code ================ Once you know the source package to work on, you will want t...
    Introduction to Ubuntu Development
    ...Once this source package is compiled, the build process provides binary packages, which are the .deb files users can install. Every time a new version of an application is released, or when someone makes a change to the source code that...

http://developer.ubuntu.com/packaging/html/debian-dir-overview.html?highlight=desktop%20file%20install#the-install-file
}

THIS LAST PART IS THE ANSWER, however... asking in "common english" i.e. Q.) "How does a package install the desktop file?" returned no results. asking with uncommon syntax for normal speakers i.e. Q.) "desktop file install" produces the correct result. So I filed this bug:
Search Engine is not very good or 'smart'

Because the search enginge wasn't smart enough to find the same content when I made it a question.
It is also not very *good* because, as you said " the answer to your question doesn't exist in the docs".

So the bug is filed against the ubuntu packing guide missing core information such as "What controls the way the software center categorieses programs?"