| 陶俊,孙坦,刘峥.关联数据映射语言：R2R[J].中国图书馆学报,2012,38(3):100~109 |
| Linked Dataset Mapping Language: R2R |
| 关联数据映射语言：R2R |
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| DOI： |
| Key words:R2R language,Linked data mapping,RDF links,Metadata,SPARQL |
| 中文关键词: R2R语言,关联数据映射,RDF链接,元数据,SPARQL |
| 基金项目: |
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| Abstract: |
| The goal of linked data is to enable client application to discover new data sources by following RDF links and to smoothly integrate data from those sources.R2R language is an RDF dataset mapping language developed by Free University of Berlin to address the issue that RDF links created by existing methods are extremely limited.R2R includes mapping properties such as r2r：prefixDefinitions，r2r：sourcePattern，r2r：targetPattern，r2r：transformation，r2r：mappingRef；R2R functions consists of string，list，arithmetic and XPath functions；varname modifiers includes URI，literals，language，datatype modifiers；mapping metadata includes r2r：hasMapping，r2r：mapsTo，r2r：dependsOn，r2r：sourceDataset，r2r：targetDataset;R2R syntax follows grammatical structure of “Resource Mapping Property Literal Value of Triples” and Turtle grammar.This paper summarizes the framework and demonstrates the usage with typical examples.Finally，we compare R2R with RDF oriented query language SPARQL，and it shows that R2R shows some degree of grammatical consistency with SPARQL in supporting RDF representation，defining varnames and modifiers，expressing prefixes of namespaces，and stating varnames with blank nodes.On the other hand，there are differences between R2R and SPARQL in functionality and syntax.In conclusion，R2R language will be helpful in creating more RDF links from terms of vocabularies and linked datasets，and supporting integrated services of linked data.2 figs.7 tabs.21 refs. |
| 中文摘要: |
| 关联数据的目标是使客户端应用通过跟踪RDF 链接发现新的数据源，实现对不同数据集的平滑整合，但现有方法创建的RDF链接十分有限，为此德国柏林自由大学于2010年提出面向RDF数据集映射的R2R语言。该语言包括r2r：prefixDefinitions，r2r：sourcePattern，r2r：targetPattern，r2r：transformation，r2r：mappingRef等映射属性，字符串函数、列表函数、算术函数、XPath函数及URI、文字、语言、数据类型等四种变量修饰符，提供r2r：hasMapping，r2r：mapsTo，r2r：dependsOn，r2r：sourceDataset，r2r：targetDataset等映射元数据，映射语句遵循“资源—映射属性—三元组文字”结构及Turtle语法等规则。在总结以上语法框架的基础上通过实例阐释其用法，并与SPARQL语言进行比较。研究认为R2R语言在支持RDF表示、变量和修饰符定义、名称空间前缀表示、空白节点定义变量等方面与SPARQL存在语法一致性特征，在功能和句法表示方面二者存在一定差别。推广R2R语言有助于从词汇和数据集实例两个层面提升RDF链接创建能力，进而为创建关联数据集成服务环境提供支持。图2。表7。参考文献21。 |
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