The new intro document was shared yesterday on the Digital Public Library of America web site.
From an Introductory Blog Post by Amy Rudersdorf, Assistant Director for Content at DPLA:
Metadata is at the heart of what DPLA is and does. We are actively harvesting metadata records from our Hubs and constantly adding to the nearly six million records currently in our datastore.
…we are often asked about our metadata application profile (called the DPLA MAP) and the metadata “requirements” for participation in DPLA. In response, we offer this new document, “An Introduction to the DPLA Metadata Model,” which offers a detailed introduction to the DPLA MAP, describes how we harvest metadata, and outlines the types of metadata that our partners provide us.
Direct to Full Text Document (4 pages; PDF)