Other institutions that currently publish Linked Open Data are public libraries, such as the German National Library of Economics (Neubert, 2009) or the Open Library (Open Library, 2012), a social-semantic book registry in the Web of Data that contains over a million books.
Thus, current datasets of educational ICT tools available on the Web of Data are presented next.
Educational ICT tool descriptions in the Web of Data
To the best of the authors' knowledge, two educational datasets of ICT tools can be found in the Web of Data: Ontoolsearch and ROLE Widget Store.
It recently moved part of its data to the Web of Data using common vocabularies (e.g., DublinCore), as well as the Role Vocabulary (Govaerts et al., 2011).
There are some other educational registries of ICT tools in the Web of Data, but they only contain a small subset of the tools that are currently employed in the classrooms.
This section presents SEEK-AT-WD, a social-semantic infrastructure that sustains a registry of educational ICT tools in the Web of Data to overcome the sustainability problems that have been previously detected.
Furthermore, some educators used an annotation tool to publish in the Web of Data their experiences using these tools, reporting that they used them satisfactorily to support a peer-review activity in blended scenarios.
This scenario could be achieved by a search facility that allows educators to make queries using educational abstractions (Vega-Gorgojo et al., 2008) while relying on an infrastructure that gathers descriptions of educational ICT tools from different sources of the Web of Data (functionality F1 in Figure 1).
First, the cold-start problem would be solved since the Web of Data already contains information that can be used to support educators when discovering educational ICT tools, as evaluated in a previous research work by the authors (Ruiz-Calleja, VegaGorgojo, Asensio-Perez, et al., 2012).
On the other hand, the Review Vocabulary (Heath & Motta, 2007) is used as a base to describe reviews since it is commonly employed for this purpose in the Web of Data. The Review Vocabulary is a very simple ontology that defines reviews related to any reviewed entity and to the person who published the review.
The aim of SEEK-AT-WD software architecture is to sustain a registry of educational ICT tools (F3) retrieving information from the Web of Data (F1) and educational annotation tools (F4).