The Graph Structure of RDF Sentences

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The Graph Structure of RDF Sentences 瞿裕忠（Yuzhong Qu） yzqu@nju.edu.cn 计算机科学与技术系

引言 An empirical study on the graph structure of RDF Sentences in the Web of Data The structural nature of RDF sentences in the Linked Data

Terminology RDF sentence, G

Terminology Statistics Cumulative distribution of RDF sentences over RDF docs 包含  k 个RDF句子的文档（百分数） Cumulative distribution of non-trivial RDF sentences over RDF docs 包含  k 个非平凡RDF句子的文档（百分数） Black nodes over（non-trivial）RDF sentences 包含  k 个black nodes 的（非平凡）句子（百分数） RDF triples over non-trivial RDF sentences 包含  k 个triples的非平凡句子（百分数）

Terminology A digraph is called "simple" if it has no loops, and no multiple arcs (arcs with same starting and ending nodes) A directed graph is an oriented simple graph if and only if it has neither self-loops nor 2-cycles. Simple, oriented simple Self-loop? Multiple arcs? Cycles of length 2?

Terminology Skeleton subgraph, GS Black node subgraph, GB removing literal nodes Black node subgraph, GB induced subgraph by black nodes

Terminology A digraph is called "simple" if it has no loops, and no multiple arcs (arcs with same starting and ending nodes) A directed graph is an oriented simple graph if and only if it has neither self-loops nor 2-cycles. Self-loop in GB Multiple arcs in GB/GS/G? Cycles of length 2 in GB/GS?

Terminology Start point: all other vertices are reachable from it Start points in G = Start points in GS ? # start points in GS ? # start points in GB

Terminology U(GS): Underlying graph of GS U(GB): Underlying graph of GB Linear, Tree, Graph with cycles

Q&A http://ws.nju.edu.cn/RDF_sentences