You're right. Thanks for suggestion.
I attached new patch now.

[stardiviner]           <Hack this world!>      GPG key ID: 47C32433
IRC(freeenode): stardiviner                     Twitter:  @numbchild
Key fingerprint = 9BAA 92BC CDDD B9EF 3B36  CB99 B8C4 B8E5 47C3 2433
Blog: http://stardiviner.github.io/


On Mon, Nov 9, 2020 at 7:05 PM Jean Louis <bugs@gnu.support> wrote:
* stardiviner <numbchild@gmail.com> [2020-11-09 03:25]:
> After waited some days, still no reponse, so I popup this email.
> Can some Org maintainer review my patch? Thanks.
> It does not changed org-contacts.el core logic. Just added a new link type.
> Should be easy to review.

If I may say, many people manage their contacts and it can be by
various ways, I am managing my contacts and by default use "contact:"

I find it useful for people to leave "contact:" link free and not bind
it to org-contact package.

Instead it is more pointful to make "org-contact:" link that
specificaly points to contacts for org-contact package.

Just "org-contact:" instead of "contact:"