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Information for Technologists

Software and Services
A next-generation framework and application for format-aware characterization, building on the succcess of the original JHOVE system. JHOVE2 generalizes the process of characterization to include signature-based identification, validation, feature extraction, and policy-based assessment.
NOID (Nice Opaque Identifiers)
Noid provides minting, binding, and resolving services in support of preservation-ready identifiers. Persistent identifiers may be obtained by a committed provider with help from these kinds of identity services.
Software download
Pairtrees for Collection Storage
Pairtree is a file system convention for the organization of a digital object store. Pairtrees have the advantage that many object operations, including backup and restore, can be performed with native operating system tools.
Software download
EAD Toolkit
This "toolkit" of freeware, commercial, and CDL-developed resources will help contributors create and submit EAD collection guides. It may also be useful for other individuals and institutions; however, please note that that the toolkit is designed to aid Digital Special Collection contributors and therefore contains some tools specific to our processes.
METS Toolkit
This "toolkit" of freeware, commercial, and CDL-developed resources will help contributors create and submit METS digital objects.
Calisphere and OAC Technical Information
Learn about the specifics of how Calisphere and the Online Archive of California (OAC) deliver primary sources to users.
eXtensible Text Framework (XTF)
Commissioned by the California Digital Library (CDL) to be the primary access tool for its collections, the eXtensible Text Framework (XTF) provides a powerful, flexible platform for providing access to digital content.
Best Practices and Standards
A URL created to allow persistent, long-term access to information objects. This standard is related to UC Curation Center's Identity service.
off siteBagIt
One of the preservation transfer tools related to work in partnership with NDIIPP.
Dublin Core [RFC 5013]
One of the standards that CDL has contributed to in partnership with NISO members.
CDL Guidelines for Digital Objects
The CDL Guidelines for Digital Objects provides specifications for all new digital objects prepared by institutions for submission to CDL for access and preservation services.
CDL Digital File Format Recommendations
This document provides recommendations for creating durable production master files -- comprising images, texts, audio, and video content -- which are also suitable for long-term storage and the creation of appropriate derivative use copies. .
CDL TEI Encoding Guidelines
Encoding guidelines produced by CDL's Structured Text Working Group.
Online Archive of California Best Practice Guidelines for EAD
These guidelines are used by content contributors when contributing EAD finding aids to the Online Archive of California (OAC).
Last updated: October 17, 2016
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