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Reference Type

Broad category of information category, used as a major classification for the references. (Corresponds in some sense to how you might group content into folders.)
Vocabularies & Standards
Established metadata convention
Content Standard
Metadata Content Standard
Ontologies and Thesauri

A type of relational controlled vocabulary, which provides for categories, relationships, rules and axioms among metadata elements. Typically a hierarchy of classes and terms, an ontology is a machine-readable way of relating metadata terminology.
Services, Protocols and Formats
Unique to Project/Tool
Vocabularies

A set of terms (e.g., words) that are used in a specific community.
Report
This is a report about a metadata convention.
Other
Not yet classified
External Information
Characterization

Information about the referenced subject(s): news, history, description, documentation, and so on.
Guidance

Detailed information on metadata usage and definitions.
Policy
Policies of organizations relating to data and metadata
Usage Examples
Instances and use cases for conventions, tools, etc
Initiatives
Metadata initiative
Data Aggregation
Demonstration Project
Metadata Dev't and Mapping
Organizations
Portal

A functioning or developing access point for data and metadata
Project
Projects that are not demonstrations
Repository
Repository for standards, for metadata, or for data. Includes catalogs.
Service Providers
Tool Development
Workshop

Workshop for metadata initiative
Other
Not yet classified.
Tools
Metadata tool
Advanced Technical Tool

This tool usually involves various complex operations or tasks, a more comprehensive user interface and feedback, and more efficient usage of available computational resources.
APIs

Application programming interfaces that are related with specifications and programming libraries.
Application

Software that is compiled or otherwise made into a single thing for distribution and installation.
Code

Simple code snippets referring to examples of programming code that demonstrate a particular way to do something.
Conceptual Model
Data Discovery

Tool to facilitate the discovery of data, as in a clearinghouse.
Data Documenter
Framework
Metadata and Data Registration
Ontology Servers

Site hosting a significant number of ontologies.
Vocabulary Crosswalks

Documents that map metadata elements between different metadata standards.
Web services
Software system designed to support interoperable machine-to-machine interaction over a network (W3C definition).
Working With Data

Transform data then use the output for a user's own purposes.
XML

Extensible Markup Language
Other
Not yet classified.
Services
A reference that links conventions?