Digital Viewer and Validator (DVV)
Version 2.3.1 (VL 3.39)
February 12th, 2026
DESCRIPTION:
The DVV is a GUI based tool for use by awardees, vendors and NDNP staff. In addition to incorporating the functionality of the NDNP Validation Library (VL), which is embedded within, the DVV also allows visual inspection of content files submitted for inclusion in the NDNP digital repository. The capability also exists to view header and metadata file content.
Detailed instructions for using the DVV can be found in the DVV User's Guide. For questions or problems, contact LC NDNP staff (ndnptech@loc.gov).
Note:
Requests to W3C
Previous versions of the validation software made repeated requests to retrieve an xml schema file from w3c. The quantity of requests was at times so large that it prompted a request from the w3c to correct the source of the requests. A fix has been applied in Validator versions 2.4 and later. The fix was included as of version 1.1 of the DVV.
CHANGES IN VERSION 2.3.1 (VL 3.39):
Resolved issue with MARC links by changing Chronicling America URL to s3 data source.