This metadata dictionary was designed for institutions contributing materials to New York Heritage. It includes descriptions, best practices, and examples for each collection metadata element. It also provides guidelines on institution level metadata, a glossary, and helpful links to controlled vocabulary resources.
Dublin Core is the metadata schema used by New York Heritage. This links to the Dublin Core Metadata Initiative's (DCMI) website. It provides some basic introductions to metadata generally, and more specifically to Dublin Core.
Dublin Core is comprised of unique 15 data elements -- Creator, Contributor, Publisher, Title, Date, Language, Format, Subject, Description, Identifier, Relation, Source, Type, Coverage, and Rights. This document describes each element and what information it covers in more detail.
TGM is a controlled vocabulary for indexing materials by subject or genre / form. The site is a great resource if you have trouble locating a specific term within your client. You can also view items with terms applied to see if it is appropriate to your item.