A digital object identifier (DOI) is a persistent identifier or handle used to uniquely identify various objects, standardized by the International Organization for Standardization (ISO). DOIs are an implementation of the Handle System; they also fit within the URI system (Uniform Resource Identifier).They are widely used to identify academic, professional, and government …

An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique class of objects, where the "object" or class may be an idea, physical countable object (or class thereof), or physical noncountable substance (or class thereof). The abbreviation ID often refers to identity, identification (the process of identifying), or an identifier (that is, an ...

デジタルオブジェクト識別子（デジタルオブジェクトしきべつし、英語: Digital Object Identifier 、略称DOI）は、インターネット上のドキュメントに恒久的に与えられる識別子である。. URLは、サーバの移転などによって変化するため、古い情報になるほどリンク切れなどの不都合が生じ …