@InProceedings{Marienfeld2013,
  author    = {Florian Marienfeld and Ina Kathrin Schieferdecker and Evanela Lapi and Nikolay Tcholtchev},
  booktitle = {Proceedings of the 9th International Symposium on Open Collaboration, Hong Kong, China, August 05 - 07, 2013},
  title     = {Metadata aggregation at GovData.de: an experience report},
  doi       = {10.1145/2491055.2491077},
  pages     = {21:1--21:5},
  publisher = {Association for Computing Machinery ({ACM})},
  abstract  = {A key challenge for open data portals is the aggregation of metadata from various data catalogs (on different administrative level or from different application fields) also known as metadata harvesting. This paper describes harvesting at the pilot of the German open government portal GovData.de, which is scheduled to become the data portal for all German public administration levels. 
At the launch of the pilot portal in February, eleven federal, state and local data catalogs were integrated, which produced about 2,000 open data sets. In the meantime, the number of data sets increased to over 3,100 mainly due to improved harvesting capabilities of the portal. This paper discusses GovData.de metadata schema and experiences with the different harvesting techniques that are in use at GovData.de: CKAN-Harvest, CKAN-API, CSW-Harvest and JSON-Dump.},
  file      = {:2013/Marienfeld2013 - Metadata Aggregation at GovData.de_ an Experience Report.pdf:PDF},
  type      = {conference},
  year      = {2013}
}