  contact
 Unterricht
 Programmiersprachen
Configuration-Management
Datenbanken
Editoren + IDEs
Linux + Sys.Admin.
 Das Web etc. 
HTML, HTML5
RSS and Atom
Ruby on Rails
Catalyst
XSLT and XSL-FO
DocBook
Cloud-Computing
Telekommunikation
career
Wirtschaft und Gesellschaft
education
products
involvements
Jochen Hayek
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