[FHS] what are the rules: /etc/defaults and system wide settings

[Jari Aalto+mail.linux]

Could someone explain what is the difference between:

    /etc/defaults/
    /usr/share/<package>/

1) Say, a file includes a 'packagerc' default settings that are used
in case $HOME/.packagerc is not set, where this file should be done?

2) If package includes a SAMPLE, what administrator must
specifically activate, where will this file be put? Is it:

    /usr/share/<package>/

Or

    /usr/share/doc/<package>/sample.packagerc

3) When package is updated and it includes a NEW version of
the default configuration 'packagerc', how should this be
handled?

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