The required or optional nature of a piece of data.
一段数据天生具有的必需或是可选的属性。
Style is an optional attribute that describes the nature of operations within this binding.
style是一个可选属性，它描述该绑定内操作的性质。
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.
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。
Optional selection for Brass brush, nature hair brush.
有棕刷、毛刷任选一种。
Optional selection for Brass brush, nature hair brush.
有棕刷、毛刷任选一种。
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