sub:assertion {
  sub:paragraph c4o:hasContent "The Web of Data spans a network of data sources of varying quality. There are a large number of high- quality data sets, for instance, in the life-science do- main, which are the result of decades of thorough curation and have been recently made available as Linked Open Data 2 . Other data sets, however, have been (semi-)automatically translated into RDF from their primary sources, or via crowdsourcing in a decen- tralized process involving a large number of contrib- utors, for example DBpedia [23]. While the combina- tion of machine-driven extraction and crowdsourcing was a reasonable approach to produce a baseline ver- sion of a greatly useful resource, it was also the cause of a wide range of quality problems, in particular in the mappings between Wikipedia at" ;
    a doco:Paragraph .
}