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Martynas Jusevičius edited this page Aug 26, 2026 · 24 revisions

Here are the features we're planning for LinkedDataHub, in a decreasing priority order. Feedback is welcome.

  • OpenID Connect-based login (with GitHub/Twitter/Google etc.)

  • Decentralized use cases

    • Saving a local copy of a remote document

    • Editing documents in a remote LDH app

      Shipped in 5.9.2. Edit affordances track the active pane's forwarded acl:mode links, and the write leg is a graph-scoped SPARQL Update PATCH through the proxy under an If-Match precondition evaluated at the origin (http-tests/federation/)

  • Inline RDF editing

  • Multi-language UI

  • Full-text search

    Instead of the SPARQL regex() based implementation, search and autocomplete widgets should be able to use triplestore's full-text search API, if such is provided

  • Support for SHACL constraints in addition to SPIN

    This will require adding a new validating request filter

  • Better SEO

    JSON-LD with schema.org metadata embedded in HTML (requires some kind of mapping if data is not using schema.org)

  • Ontology import that generates constructors for classes

    Currently exists in experimental form

  • New UI for constructors: template with fields (as in Podio, PowerApps etc) instead of SPARQL query string

    It could possibly be reused for CSV mapping queries

  • Date/time picker widget

  • Get rid of the server-side Linked Data proxy

    • Load RDF data from remote sources client-side (this will make sources that do not send CORS headers inaccessible)
    • Re-serialize RDF to RDF/XML (accepted by the XSLT stylesheets) client-side

  • New HTML+RDFa editor that allows:

    Shipped in 5.7.0 (#336), replacing WYMEditor as the rdf:XMLLiteral editing surface. Declarative XHTML+RDFa authoring in client-side XSLT 3.0 (RDFa-Editor), with W3C-conformant RDFa 1.1 extraction and Exclusive XML Canonicalization on save

    • Semantic annotations (e.g. selecting text, choosing property from typeahead and entering a value to create a triple)

    • Embedding objects, similar to notebooks

      Object blocks are defined purely in RDF and embedded as self-describing RDFa placeholders, edited as atomic islands and hydrated client-side from content-negotiated Linked Data URIs — only the RDFa description is stored

      • Resources
      • Files
      • Charts
      • SPARQL queries/results
      • HTML content

  • Improved map layout

    • Support for WKT literals (including polygons)

  • Improved graph layout

    • Selecting/moving nodes
    • Editing RDF in graph mode

  • Support for packages that combine RDF ontology and XSLT stylesheet

    Shipped in 5.9.2 (#361) as a declarative mechanism: an application imports a package with a single <app> ldh:import <package-uri> triple in its dataspace settings, and the package's ldt:ontology joins the ontology imports closure while its ac:stylesheet is composed into the application stylesheet in memory at compile time. Nothing is copied into the webapp

  • Command line interface for the HTTP API

    Shipped in 5.9.2 as ldh (cli/) — a picocli/Jena port of the bin/ shell scripts, one command per script with the same option names and bin/ subdirectories as nested subcommand groups. Authenticates with the PKCS12 WebID keystore; a created document's URL is the only thing on stdout, so commands compose in pipelines. The http-tests suite builds its fixtures with it (260 invocations of 19 commands per CI run), which is also its end-to-end coverage. The bin/ HTTP scripts are deprecated; the certificate and WebID tooling there is not

  • Vocabulary editor modes

    • OWL ontology editor
    • SKOS taxonomy editor

  • Graceful degradation -[ ] Make sure the UI is still functional with JavaScript disabled

  • Document versioning (possibly support for the Memento protocol)

    GitHub-backed: writes mirror each document into a repository as a sorted N-Triples commit authored with the agent's WebID. RFC 7089 conformance shipped in 5.9.2 — ?version= mementos, ?timemap (PROV-O description plus an application/link-format serialization), ?timegate for Accept-Datetime negotiation, and the IANA-registered relation types. See Graph Versioning Implementation Plan

    • See a list of revisions

      History modal with agent attribution, opened from the document's action-bar timestamp (5.9.0)

    • See changes between revisions

      From/To selection renders the diff on the document page itself — added/removed/changed block borders, marked property values, stacked old/new XHTML content (5.9.2)

    • Restore a document to an earlier version

      Per-row action in the history modal; the restore rolls forward as a new commit, so mementos stay immutable as RFC 7089 requires (5.9.2)

  • Comments on documents? Social media style

  • New design theme (for example using Material design)

  • Mobile client app

  • Refactor the stylesheets using XSLT 3.0 packages

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