Blogger RSS feed and category URLs with combined labels/tags

Run a blog on blogger.com? Maybe made it bilingual? Maybe blog on different topics? Wondering how the URL for an RSS feed for e.g. two labels looks like? Asking how to see all articles matching two tags (labels)? Finding a keyword under one or more labels? Many things are possible. I'll show a few examples below. Maybe that is even interesting for the planet Debian folks. I happen to blog mostly in English about Debian topics. But sometimes I also want to post something in German only (e.g. about German tax software). It is discouraged to put the latter on planet-debian. Instead it can be published in the language specific planet feed. So instead of adding new tags, one could easily combine two labels: the one for language of the feed and the one for Debian related posts (e.g. debian+english or debian+german). Therefor this post goes to the Debian planet.

Search for combbined labels/tags

Say I want to view all postings related to the topics FOO and BAR. Then it is:

http://domain.tld/search/label/FOO+BAR OR
http://domain.tld/search/?q=label:FOO+label:BAR

Be aware that labels are case sensitive and that more labels can be added. The examples below will show all postings related to the topics debian and n54l and xbmc:

http://www.wgdd.de/search/label/debian+n54l+xbmc
http://www.wgdd.de/search/?q=label:debian+label:n54l+label:xbmc

It is also possible to search for all posts related to the topics FOO or BAR:

http://domain.tld/search/?q=label:FOO|label:BAR

Say for example, you want to see all postings related to the topics logitech or toshiba, then it is:

http://www.wgdd.de/search/?q=label:logitech|label:toshiba

Feed URLs

To get back to the first example lets say, the feed shall contain all posts related to the topics FOO and BAR. Then it is:

http://domain.tld/feeds/posts/default/-/FOO/BAR/ OR
http://domain.tld/feeds/posts/default?q=label:FOO+label:BAR

Respecitvely to show all feeds related to either of those topics use:

http://domain.tld/feeds/posts/default/?q=label:FOO|label:BAR

To get a feed of the example topics as shown above then would be:

http://www.wgdd.de/feeds/posts/default/-/debian/n54l/xbmc/
http://www.wgdd.de/feeds/posts/default?q=label:debian+label:n54l+label:xbmc
http://www.wgdd.de/feeds/posts/default?q=label:logitech|label:toshiba

Coming back to planet Debian, below is a solution for a multi-lingual planet contribution (if both planets would exist):

http://www.wgdd.de/feeds/posts/default?q=label:planet-debian+label:english
http://www.wgdd.de/feeds/posts/default?q=label:planet-debian+label:german

Advanced ...

There is much more possible. I'll just show two more examples. AND and OR can be combined ...

http://www.wgdd.de/feeds/posts/default?q=label:debian+(label:logitech|label:toshiba)

... and a keyword search can be added too:

http://www.wgdd.de/feeds/posts/default?q=stick+(label:debian+(label:logitech|label:toshiba))

Links

• https://support.google.com/blogger/answer/97933
• https://support.google.com/blogger/answer/53336
• https://developers.google.com/blogger/docs/3.0/reference/posts#resource
• http://www.mybloggertricks.com/2014/01/17-best-search-techniques-in-blogger.html

Petition zum Erhalt und Fortbestand der Professur für Technische Chemie an der TU Dresden

In eigener Sache bitte ich Kenner, ehemalige Studenten und Sympathisanten des Instituts für Technische Chemie Dresden um Unterstützung bei der Petition zum Erhalt und Fortbestand der einzigen Professur für Technische Chemie an der TU Dresden. Da ich selber in der Vergangenheit sehr eng mit dieser Professur (und mittelständischen Unternehmen) zusammen gearbeitet habe, waren die Ereignisse (PDF) der letzten Jahre überraschend für mich. Ich kann mir eine Technische Universität ohne die Professur kaum vorstellen.

Link zur Petition

Changed to blogger.com

I changed from a local wordpress installation to nanoblogger recently. The tool is nice, but becomes slow over time and misses a few features recent blogging engines already have. Therefor I was looking out for blog hosting services. Seems wordpress.com only offers domain support on charge. So I'm currently testing blogger.com.

Back to life

I'm going to breathe new life into this blog. Stay tuned ;)

Fixed server outtime

The server and the whole domain wgdd.de were unreachable since this morning. This has been fixed now and everything should work as expected.

Good bye Warren ...

A tragic loss has hit the open source software community. Warren Lyford DeLano, among other things, open source advocate, scientist and the author of the famous PyMOL molecular visualization system, suddenly passed away at the age of 37. I remember you as a genial, pleasent intelligent guy and software author. It has been a pleasure to work with you. Good bye.

Green IT - a GSoC topic?

I'm back from the conference at Berlin "Faktor X - Tag der natürlichen Ressourcen", a side-conference of the World Resources Forum 2009 in Davos.

It was pretty interesting, although the topic is not new. If you don't know it: We are running out of (several) resources. The main topics going through the media are often energy and oil. Well, several metals will become much more problematic much more earlier! So, what is the aim: material-, product- and production-efficiency and recycling/upcycling(/downcycling).

One of the topics mentioned at the conference was the IT industry. One of the keywords is green IT - more efficiency through IT, more efficiency by more efficient hardware, better recycling of hardware, .... Another point was more efficiency by more efficient software. One of the questions mentioned was “how much resources costs a click at google?”. I think, one can adapt this question to almost every software. We have several software, which is widely used. I'll just mention the apache web-server. Would't it be good to know, that this widely used software won't waste CPU cycles for nothing?

So what about a GSoC project checking such often/widely used software for efficiency (besides checking for buffer or heap overflows or NULL pointer dereferences)? Can anybody imagine such a project? What is your opinion?

Sorry

I'm sorry for any inconvenience you had yesterday or today trying to access my web services. But I had to perform some long standing maintenance tasks. The service is now running again. If you still observe problems, please don't hesitate to tell me.

Hallo Welt!

Hier wird hoffentlich bald mehr stehen? Die Prüfungszeit zwingt mich dazu, das Füllen dieser Seiten mit hoffentlich interessanten Informationen um einige Zeit zu verschieben. Man liest sich danach (hoffentlich).