CLARA Knowledge Graph of licensed educational resources (Standard reification)

/!\ This deposit is deprecated; a more complete version of the deposit can be found here: 8403142. /!\

CLARAThis deposit is part of the CLARA project. The CLARA project aims to empower teachers in the task of creating new educational resources. And in particular with the task of handling the licenses of reused educational resources.

The present deposit contains the RDF files created using an RDF mapping (RML) and a mapper (Morph-KGC). The files used as inputs can be found here. That pipeline can be found on Gitlab. The data used in that pipeline originate from X5GON, a European project aiming to generate and gather open educational resources.

ContentThe present Knowledge Graph contains information about 45K educational resources and 135K subjects (extracted from DBpedia).That information contains 

the author,

its title and description

the license,

a URL to the resource itself,

the language of the educational resource,

its mimetype,

and finally which subject it talks about, and to what extent.

That extent is given by two scores, a PageRank score and a cosinus score (that were not calculated on our graph but during the X5GON project)

A particularity of the Knowledge Graph is its heavy use of RDF reification, across large multi-valued properties.Other versions of the same deposit can be found using different reification models:

Named graphs

Singleton properties

RDF-star

The Knowledge Graph also contains categories originating from DBpedia. They help precise the subjects that are also extracted from DBpedia.

The deposit contains five types of files:

Authors_[X].nt - Those contain the authors' nodes, their type, and name.

ER_[X].nt - Those contain the educational resources and their information using standard reification.

categories_skos_[X].ttl - Those contain the hierarchy of DBpedia categories.

categories_labels.ttl  - This file contains additional information about the categories.

categories_article.ttl - This file contains the RDF triples that link the DBpedia subjects to the DBpedia categories.

/! 此数据集已弃用；可在此处获取该数据集的完整版本：8403142。/!

本数据集隶属于CLARA项目。CLARA项目旨在赋能教师开展新型教育资源创作工作，尤其聚焦于复用教育资源的版权许可处理任务。

本数据集包含通过RDF映射（RML）与映射工具（Morph-KGC）生成的RDF文件。作为输入的相关文件可在此处获取。该数据处理流水线可在Gitlab平台获取。该流水线所用数据源自X5GON项目——一项旨在生成并汇聚开放教育资源的欧洲科研项目。

## 数据集内容
本知识图谱（Knowledge Graph）包含约4.5万条教育资源与13.5万条学科条目信息（均从DBpedia中提取），涵盖以下内容：
- 作者信息
- 资源标题与描述
- 版权许可
- 资源访问URL
- 教育资源的语言类型
- 资源的MIME类型
- 关联学科及其关联程度

该关联程度由两项评分表征：PageRank评分与余弦相似度评分（两项评分并非在本知识图谱中计算得出，而是在X5GON项目期间完成）。

本知识图谱的一大特色是在大量多值属性上广泛使用RDF具体化（RDF reification）机制。本数据集的其他版本可通过不同的具体化模型获取，包括：命名图（Named graphs）、单例属性（Singleton properties）以及RDF-star。

本知识图谱还包含源自DBpedia的分类体系，用于细化从DBpedia提取的学科条目。

本数据集包含五类文件：
1. Authors_[X].nt：此类文件存储作者节点、节点类型与作者姓名信息
2. ER_[X].nt：此类文件存储教育资源及其相关信息，采用标准RDF具体化机制
3. categories_skos_[X].ttl：此类文件存储DBpedia分类体系的层级结构
4. categories_labels.ttl：该文件存储分类体系的补充信息
5. categories_article.ttl：该文件存储用于关联DBpedia学科条目与DBpedia分类体系的RDF三元组