[5] 名前空間。Namespace。
schema.*
NS:
[6] RDF 1.1 Concepts and Abstract Syntax ( (4/25/2014, 8:18:11 PM 版)) https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-concepts/index.html#dfn-namespace
[7] Semantic Interpretation for Speech Recognition (SISR) Version 1.0 (10/2/2017, 10:33:39 AM) https://www.w3.org/TR/semantic-interpretation/#SI7.3
Google search: 名前空間