From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: org-caldav problem; used to work
Date: Mon, 17 Nov 2014 00:12:29 +0100
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In-Reply-To: <20141116235825.420fe95a@linux-w3xx> (Detlef Steuer's message of
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To: Detlef Steuer <detlef.steuer@gmx.de>
Cc: emacs-orgmode@gnu.org

Hello,

Detlef Steuer <detlef.steuer@gmx.de> writes:

> But there was a new Problem: A new set of UIDs got created when I edited
> my test data. (removed the SCHEDLULED key-word)
>
> --- Before (result of first test export)
>
> * APPT Test1 
>   SCHEDULED: <2014-11-12 Mi 19:00-20:00>
>   :PROPERTIES:
>   :ID:       dc432cb8-ab29-4bf0-8ea0-e40ca8e8850d
>   :END:

[...]

> removed SCHEDULED

A properties drawer needs to be the second element in the entry,
planning info being the first, or the first one if there is no planning
info.

If you remove "SCHEDULED:", you also remove planning info only to leave
a plain timestamp (in a paragraph, but that doesn't matter here). The
properties drawer is no longer correctly located in your entry: it
becomes a regular drawer named "PROPERTIES".

As a consequence, ox-icalendar can no longer recognize entry's ID and
creates a new one, correctly located this time, before next export:

> --- After
>
> * APPT Test1 
>   :PROPERTIES:
>   :ID:       867c4f4e-9c7f-4d39-9404-f9dadb25edd9
>   :END:
>   <2014-11-12 Mi 19:00-20:00>
>   :PROPERTIES:
>   :ID:       dc432cb8-ab29-4bf0-8ea0-e40ca8e8850d
>   :END:

Long story short: if you remove "SCHEDULED:", also move the timestamp
/after/ the drawer.


Regards,

-- 
Nicolas Goaziou