Stefan Hagen

If you have questions - please contact me.

A few sentences about me: My name is Stefan Hagen, pronounced like: [ʃtɛfaːn haːgən]. I work at Cisco, engineering quality into the ParStream database, but these here are my personal pages as individual. I love to support with words and deeds. Two technical committees at “Organization for the Advancement of Structured Information Standards” (OASIS) bear with me as officer. 1) Since 2007 and together with Juan Carlos Cruellas I chair the OASIS Digital Signature Services eXtended (DSS-X) Technical Committee (TC) to help advancing digital signature services standards for XML. 2) I support simplifying data sharing across disparate applications in enterprise, cloud, and mobile devices by serving as secretary to the “OASIS Open Data Protocol (OData) TC” since it's formation in 2012. 3) Hopefully having more time in the future to further contribute to AMQP/Websockets at the OASIS Advanced Message Queuing Protocol (AMQP) Bindings and Mappings (AMQP-BINDMAP) TC and the Message Queuing Telemetry Transport (MQTT) "next generation" protocol within the MQTT TC 4) independent of OASIS, I work as a part of the GeoJSON community (@Github), the IETF JSON, and IETF Geographic JSON Working Groups on the simplification of the communication between applications through optimal general and geographic data formats and consistent processing expectations.

A picture: ... is worth a thousand words? Maybe, sometimes. A small snippet GeoJSON. Elegant, right?

Music: Over the last 30 years, I learned playing the guitar from Erich Lanzerath and Thomas Offermann. As of this year, I started learning with József Eötvös.

A good thing: The initiative “Bonner Tafel” works under the motto “Verteilen statt Vernichten” (German for: “distribute instead of destroy” Volunteers collect / inside in and around Bonn a food that would otherwise be destroyed. These foods are passed through dispensaries to needy households and to non-profit institutions. Additional support through a monetary or in-kind donation or by volunteering is welcome. To the website of the “Bonner Tafel” (in German language)...

A selection of recent publications of the Committees (publications in public review, or working group last call are highlighted):

Latest lecture: “Data, Management, Decision Oriented” at the European University of Applied Sciences, Neuss in June/August, 2013.

A little tool: QualityPie supports the methods recommended in “One-view visualization of speech quality measurement results” (Klemens P. F. Adler, Hans Wilhelm Gierlich and Joachim Pomy (Ed.)., ITU-T Recommendation P.505, 29 November 2005). Further details of Recommendation P.505 (2005) Amendment 1 (06/12) or follow the link to 'Quality Pie' inside the section Special Projects and Issues at the study group ITU-T SG 12.

Questions & Answers: Asking questions may not be my strength ;-), but as I received quite some answers in my life already, I started answering other peoples questions. E.g. my profile at StackOverflow:
Why practice :?) - Any personal contribution of this user is distributed under the MIT license. All opinions expressed only on behalf of himself.