README
Title of the dataset:
TU Delft Repository Metadata Exports – JSON Record Types Collection
Short description of contents:
This dataset contains categorized JSON metadata exports from the TU Delft University Repository. Each file represents a group of records of a specific type (e.g., journal_article, doctoral_thesis, artefact, etc.), exported and stored as separate .json files.
File naming convention:
Each file is named using the record type in lowercase with underscores (e.g., bachelor_thesis.json, journal_article.json, design.json). The names directly correspond to the content type classification in the TU Delft repository.
File format:
All files are in standard JSON format, encoded in UTF-8.
File structure and relationships:
The dataset is organized as a flat collection of .json files within a ZIP archive. Each file contains an array of JSON objects, where each object represents a single repository record. There is no direct relational structure between files; each file is standalone.
Contact information:
TU Delft University Library
E: datasupport@tudelft.nl
W: https://data.4tu.nl/

Methodological Information
Method of data collection and processing:
The metadata was exported using an internal API that queries the repository's RDF store. A custom Node.js script (without a framework) was used to transform RDF triples into a simplified JSON schema based on record types.
Software used:
    • Node.js v18
    • RDF query system: Virtuoso OpenLink (SPARQL)
    • Export tool: In-house script (exportRecords.js)
Instruments or standards:
The record structure follows TU Delft’s metadata model aligned with Dublin Core and repository-specific vocabularies.
Quality assurance procedures:
    • Validated JSON syntax using automated CI tests
    • Verified type conformity against repository schema
    • Checked for duplicate records and null fields
Codes or symbols:
    • uuid: Unique identifier for each repository record
    • resolver_link: Persistent URL to the public repository record
    • Dates are in ISO 8601 format
    • Some fields may be missing (null) when metadata is not available

Data-Specific Information
Column names / field definitions (per JSON object):
Field
Description
Example
uuid
Universally unique identifier of the record
"d4fb8762-07d0-4450-8d74-a43fc9a5487b"
resolver_link
Persistent URL to the public record in the repository
"https://resolver.tudelft.nl/uuid:d4fb8762-07d0-4450-8d74-a43fc9a5487b"
object_type
Type of record (e.g., design, report, thesis)
"design"
status
Accessibility status
"OPEN"
date_modified
ISO 8601 timestamp of last modification
"2019-01-10T18:58:42.349+01:00"
title
Title of the record
"Cubby+ A desktop VR system for precision manipulation"
description
Abstract or short description
"Reviewed design portfolio..."
publication_date
Year of publication
"2002"
contributors
List of contributors/authors with full names
[{ "fullname": "JW Frens" }, ...]
files
Download links for associated files
["https://repository.tudelft.nl/file/"]
linkstofile
Reserved for alternative links (optional)
""
Units of measurement:
Not applicable – metadata only.
Missing data indicators:
Missing fields may be completely absent or explicitly set to null or empty strings ("").

Sharing and Access Information
License:
In support of Open Science, this dataset is shared under the CC0 (Creative Commons Attribution 1.0 Universal) license.
This means you are free to use, share, and adapt the dataset.
More info: https://creativecommons.org/publicdomain/zero/1.0/

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