1.1 Documentation
1.2 History
1.3 Standards
1.4 Trademarks
1.5 Introduction (ISO 26324)
1.6 Overview
      1.6.1 The DOI system concept
      1.6.2 DOI system components
      1.6.3 DOI name syntax
      1.6.4 DOI name resolution
      1.6.5 DOI^® data model
      1.6.6 DOI system implementation
1.7 Benefits of the DOI system

2.1 Assigning numbers
2.2 Syntax of a DOI name
      2.2.1 General characteristics
      2.2.2 DOI prefix
      2.2.3 DOI suffix
2.3 Assignment of DOI name
      2.3.1 Principles of assignment
      2.3.2 Granularity
      2.3.3 Changed items
      2.3.4 Description
      2.3.5 Uniqueness
      2.3.6 Persistence
2.4 Case sensitivity
2.5 Character sets and encoding
      2.5.1 Encoding principles
      2.5.2 Encoding specifications
            2.5.2.1 UTF-8 Encoding
            2.5.2.2 Encoding recommendations when used in URLs
            2.5.2.3 Encoding issues
            2.5.2.4 Mandatory and recommended encoding for DOI deposit and URLs
2.6 Visual presentation and other representation of DOI names
      2.6.1 Screen and print presentation
      2.6.2 URI presentation
      2.6.3 URI presentation
      2.6.4 Other representations
      2.6.5 Principles
2.7 Relationship between the DOI system and other ISO identifier schemes
      2.7.1 A brief outline
      2.7.2 Principles
      2.7.3 Expressing the relationship of DOI names to other identifier schemes
            2.7.3.1 Referent of a DOI name having an existing identifier within other identifier schemes
            2.7.3.2 Incorporation of an existing identifier into a DOI name
            2.7.3.3 Additional functionality
2.8 Relationship between the DOI system and other (non-ISO) identifier schemes
      2.8.1 Using DOI names to express relationships with existing legacy identifiers
      2.8.2 Benefits of using legacy identifiers with DOI names
      2.8.3 Representation of DOI in other identifier schemes
2.9 DOI names and check digits
2.10 shortDOI service
2.11 The DOI system and Internet identifier specifications

3.1 DOI Resolution
3.2 Simple resolution
3.3 Multiple resolution
3.4 Resolution requirements for the DOI system
3.5 Handle System^® technology
      3.5.1 Overview
      3.5.2 Technical support of DOI name resolution
      3.5.3 Software support for use of DOI names
3.6 The maintenance of DOI name "state data"
3.7 Resolution interface with Handle System
      3.7.1 Custom Resolution Software
      3.7.2 Native resolver
      3.7.3 Proxy server
      3.7.4 Other mechanisms
3.8 DOI system Proxy Server technical details
      3.8.1 Resolving DOIs Using the Proxy Server System
      3.8.2 Proxy Server Query Parameters
      3.8.3 Proxy Server REST API
      3.8.4 Additional Functionality
            3.8.4.1 Local Content Servers (The "Appropriate Copy" Problem)
            3.8.4.2 Parameter Passing
            3.8.4.3 Resolution of Multiple URLs using the 10320/loc Handle Type

4.1 Overview of the DOI^® data model
4.2 Aims of DOI data model policy
      4.2.1 Interoperability
      4.2.2 Administrative capability
4.3 DOI metadata
      4.3.1 DOI^® metadata Kernel
      4.3.2 Use of the DOI Kernel
      4.3.3 Procedure for management of DOI metadata schemas
            4.3.3.1 Adding values to the Kernel controlled vocabularies
            4.3.3.2 Update procedure
      4.3.4 DOI Data Dictionary
      4.3.5 Vocabulary Mapping Framework
      4.3.6 Metadata integration:goals of the IDF
4.4 Metadata requirements, ISO 26324
4.5 Underlying ontology

5.1 Introduction
5.2 Designing Applications
      5.2.1 Basic Functionality
      5.2.2 Design Considerations
5.3 Multiple Resolution Applications
5.4 Linked Data
      5.4.1 Content Negotiation
5.5 Application Profiles
5.6 Expressing Relationships Between DOI Names
5.7 Using the DOI System with Digital Object technologies
      5.7.1 Digital Object Registry
      5.7.2 DO Architecture
5.8 Using DOI names to identify fragments

9.1 The DOI Directory
      9.1.1 DOI prefix assignment
      9.1.2 Using a local handle service run by the DOI Directory Manager
      9.1.3 Running a local handle service
      9.1.4 Registering a DOI name with associated metadata
      9.1.5 Transferring DOI names from one registrant to another
      9.1.6 Transferring DOI names from one Registration Agency to another
      9.1.7 DOI system error messages
9.2 Handle System
      9.2.1 Requirements for operating a local handle service
      9.2.2 Requirements for providers of resolution services
      9.2.3 Developing Handle System client software
9.3 DOI Data Dictionary