用数据库搜索来检索结构化且严格匹配的数据十分管用，但这需要对查询结构和数据模型十分熟悉和了解才行。
Database search is great to retrieve structured and exactly matched data, but it requires highly specialized knowledge on query construction and data model familiarity.
每篇文章都提供结构化数据，可以方便地与其他数据源匹配和组合。
And every one of those articles is coupled with structured data that makes it easy to mix and match with other data sources.
还了解了SPARQL如何在可选和可替换匹配的帮助下，让您了解真实的rdf图的半结构化特性。
You've seen how SPARQL allows you to approach the semi-structured nature of real-world RDF graphs, with the aid of optional and alternative matches.
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