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188 Journal of Library Science in China, Vol.10, 2018

database. The search module of SOOOPA can retrieve words, multi-words, simplified and
traditional Chinese characters and resource URIs, which can make intelligent ranking of search
results. The retrieval results also give a link to other open resources, and the relevant information
of the entries can be seen in other data sources in these results.
In addition to these search services, SinoPedia also provides Linked Data publishing services
that can act as Linked Data distribution centers (Hubs). The SinoPedia provides a unified RDF
data publication and content negotiation service for different Linked Data sites accessed by
SPARQL Endpoints. Our platform extends the system of LODVIEW to support SPARQL Endpoint
configurations with multiple external data sources. Resources from different sources are re-
assigned in SinoPedia to obtain a uniform resource URI address, and, these resources can be
redirected to the origin resource. The raw data of this resource are published using the new URI
address of SinoPedia platform.
The SinoPedia integrates the LODLIVE system to realize the discovery and integration of
Linked Data between different resources. The unified publication of different data sets achieves the
unity of data syntax layer (RDF structuring). The links of different data sets achieve the unity of
the data semantic layer, that is, the integration of multi-source data is realized through association.
LODLIVE’s Discovery Module displays the Linked Data from different sources in the form of
knowledge graph. This Discovery Module also implements semantic extension and knowledge
discovery services for resources through correlation.
At present, SinoPedia currently contains 5.54 million triplet data that includes people, places and
institutions, and 730,000 instances. SinoPedia also provides API interface and SPARQL Endpoint
calls. Finally, SinoPedia endpoint will also be registered in the Linked Open Data (LOD) cloud
to make up the deficiency of knowledge base of Chinese encyclopedia in the LOD. In the future,
SinoPedia can be used as a data link center in the digital humanities field to get more resource
information by connecting to SinoPedia, and promote the development of digital humanities
research.

The connotation, structure and description model of knowledge unit

SUO Chuanjun〇 & GAI Shuangshuang
〇a*
In the new information environment, the way of knowledge organization based on documents
cannot meet the users’ knowledge needs. In order to achieve fine-grained semantic knowledge
organization and refined knowledge service, the fine-grained knowledge units contained in the
documents become one of the hot topics in multi-disciplinary research. Revealing the connotation
and structure of the knowledge unit becomes an important basic theoretical problem to be studied

* Correspondence should be addressed to SUO Chuanjun, Email: suocj@ruc.edu.cn, ORCID: 0000-0002-7416-1531