Bug fixes and new features -------------------------- VLO 4.15.0 (September 2026) * UI migrated from Bootstrap 3 to Bootstrap 5: stylesheets are compiled with Sass instead of LESS, Font Awesome was upgraded and Glyphicons removed * Solr configuration brought up to date with Solr 9 * Continuous integration migrated from Travis CI to GitHub Actions * Various dependency and security updates VLO 4.14.0 (July 2026) * Tombstone records: minimal information is retained for removed records * Improved search suggestions: prioritise the most relevant imported fields and no longer suggest some e-mail addresses * Upgraded frameworks and dependencies: Tomcat 10, Wicket 10, Spring 6 and the Jakarta EE 9 APIs, updated Solr client, and various dependency and security updates VLO 4.13.0 (February 2026) * Dependency updates * New field: "alternative name" * New field: 'first seen' * Initially expand facets that have an active selection * Removed references to deprecated CLARIN website content (FAQs) * Language info page: MultiTree link removed VLO 4.12.4 (October 2025) * Minor dependency updates * Updated bundled VLO mappings definition VLO 4.12.3 (May 2025) * Various dependency updates * Fixed: PID info shows identifier itself in case it can't be resolved * Fixed: URN:NBN resolver API changed VLO 4.12.2 (March 2025) * Various dependency updates * Built for Java 21 * Removed "exposure tracking" feature and corresponding components VLO 4.12.1 (September 2024) * Fixed: index change monitor JAR is not executable * Fixed: issue with alias handles * Skip and log warning in case of unsupported CMDI version * Change label for 'dataProvider' field to 'Metadata provider' VLO 4.12.0 (August 2024) * Requesting of a record by self link in URL * Search for records by normalized self link * Fewer requests made to centre registry on loading of contributors page * Custom user agent for requests from importer / web app * Label for 'Format' facet changed 'File type' * Whitespace properly trimmed in field values * Adding of a field _metadataDirectory * `0` values ignored when populating temporal coverage field * Various dependency updates VLO 4.11.6 (December 2023) * Using the new linkchecker persistence library (v1.0.0) * Upgraded Java XML and JSON binding framework versions * Various fixes in scripts * Various dependency updates VLO 4.11.5 (August 2023) * CMDIRecordProcessor designed to be used by curation to encapsulate the full import logic. VLO 4.11.4 (May 2023) * Using updated linkchecker persistence library (changes in database schema) VLO 4.11.3 (March 2023) * Using new linkchecker persistence library to access resource availability status information * Importer no longer distributed as a 'fat jar' (jar with dependencies) VLO 4.11.2 (November 2022) * Actionable links that are not PIDs are not recognised as actionable VLO 4.11.1 (October 2022) * Fixed linkchecker database access problem * Fixed database access problem of VLO change monitor * Embedded handle resolver classes from MPI corpus structure library to fix vulnerability VLO 4.11.0 (September 2022) * New method of submitting records and items to a Virtual Collection * Cleaner permalinks * Short timeout for handle resolution for record page * Import: header profile ID value validation VLO 4.10.3 (April 2022) * Various dependencies upgraded * Fix in CMDI - HTML stylesheet * Visibility of metadata hierarchies VLO 4.10.2 (December 2021) * Various dependencies upgraded, * Migrated logging to latest version of Log4J 2.x (which fixes log4shell vulnerability) VLO 4.10.1 (August 2021) * Resource availability status API (RASA) updated * Threshold for age of link status information VLO 4.10.0 (April 2021) * Temporal coverage facet has been added * Made Switchboard pop-up configurable * New facets configuration file * Conditional facet MULTILINGUAL VLO 4.9.4 (April 2021) * switchboard pop-up disabled VLO 4.9.3 (March 2021) * switchboard pop-up enabled * Fixed issue with guided tour VLO 4.9.2 (October 2020) * New version of resource availability status API VLO 4.9.1 (September 2020) * Dataset metadata validation errors * Update VCR integration * Tour script is not loaded (timely) * 'Empty' filter query is accepted VLO 4.9.0 (July 2020) * Show more precise but user friendly media type for resources * Embedded Schema.org metadata for datasets * Make switchboard connection more prominent/obvious * Show language labels in collapsed search results * Use long date format * Make web app locale static * Upgrade to RASA 2.8 * Add busy indicator to "all values" panel interactions * Prepared implementation of Switchboard pop-up VLO 4.8.2 (March 2020) * Using new link checker API * FCS integration can be disabled * Fixed bug caused by invalid selection received through query parameters of URL VLO 4.8.1 (February 2020) * Upper bound for number of collections sent to statistics reporting VLO 4.8.0 (January 2020) * Creator information is displayed for records that provide this information * Improve record page 'sidebar' icons, including option to invoke the switchboard * Improvement to links table for a record: do not duplicate non-resource links on every page, and also include search page and service links * Widget to copy the link to a page has been simplified * Changed text of landing page links in search results * Technical improvements to the guided tour, and made visually more distinct * Document identifier now by default as a URL path parameter for the record page * Exposure/impression statistics are gathered * Extended options for VLO localization/branding * The front end's favicon is now the VLO icon * All VLO components are now running on Java 11 * Upgraded the version of the CLARIN base style, now using v0.4.0 (Bootstrap 3.4.1) VLO 4.7.2 (October 2019) * Fix for landing page not shown in "links" table for records with only a landing page * Fix for error on clicking PID info link for some record identifiers * Fix for rendering issues for links in technical details * Configurable 'batch size' for resource availability update VLO 4.7.1 (September 2019) * Removed 'multilingual' from the record details view * New version of resource availability status API * Updated several other dependencies VLO 4.7.0 (May 2019) * Landing page link in results should get 'home' icon * A page listing all actual contributors to the VLO, i.e. all metadata providers registered in the centre registry (accessible via the main menu on the top of the page) * Visual indication of (possibly) inaccessible or unavailable resources in search results and record pages * Make data provider (CLARIN centre) a facet * A new facet 'multilingual: yes/no' * Title of 'resources' tab was changed to 'links' * Bugfix: null URL causes NPE in XsltModel VLO 4.6.0 (February 2019) * 'Collapsing' of (near) duplicate search results (based on configurable 'signature') * PIDs (Handles, DOIs) marked in an easily recognisable way with an actionable link and info dialogue and shown more prominently * Landing pages shown with more prominence in search result and record page * Fix in parsing for automatic link generation in descriptions * Missing collection name in metadata no longer mapped to harvest set name * One-click copy link to clipboard * VLO configuration gets exposed publicly as protected resources * VLO importer logic refactored to allow for easier use as a library * Use of latest version of the CLARIN base style with self-hosted fonts * Improved facet value filtering interaction VLO 4.5.3 (November 2018) * Fixed a link to the Language Resource Switchboard on the help page VLO 4.5.2 (October 2018) * Various external service URLs made configurable at build time (for docker configurability) VLO 4.5.1 (September 2018) * Funding statements adapted * Solr version bumped to 7.4.0 VLO 4.5.0 (July 2018) * The URL in the address bar updates on changes through Ajax for better sharing * A guided tour has been added to the web app * User satisfaction can be elicited * EOSC-hub statement added to the web app's footer * Solr authorisation * Referencing to field-keys instead of solr field names in VloConfig * Schema validation of VloConfig.xml VLO 4.4.3 (May 2018) * Fixed a regression in the web app VLO 4.4.2 (May 2018) * Fixed a regression in the statistics generator VLO 4.4.1 (May 2018) * Fixed a regression in the web app which broke the rendering of licence names VLO 4.4.0 (April 2018) ## New and improved features ## * A link to the landing page, if available, is shown in the search results * All licence URIs, if available and mappable from the metadata, are shown on the record page * The value selection change in the 'more' dialogue is applied in the background * Records that have no resource proxy at all are skipped during import * New value mapping strategy for normalisation and metadata curation * Normalisation: map to null to exclude a value in a field * Normalisation: map to multiple values * Data provider and national project fields populated based on data from OAI-PMH and the centre registry ## Bug fixes ## * Storing full text again, fixing retrieval issues * Facet tooltips re-initialisation after expansion/collapse * Fixed potential race condition that can cause failure to detect duplicate ids * Better/fixed Ajax response status feedback ## Other changes ## * Make Wicket develop/deployment mode configurable through environment variable * Make the list of fields configurable * Cleanup: remove unused Javascript plugins * Stability: avoiding possible Null-values for immutable objects VLO 4.3.6 (February 2018) * Fixes missing field values in random records VLO-4.3.5 (February 2018) * Reverted changes in 4.3.4 that cause issues in the front end (while keeping the fix for #133) VLO-4.3.4 (February 2018) * Fixed issue with retrieving similar documents, leading to errors loading the record page VLO-4.3.3 (January 2018) * Fixed issue with boolean query operator interpretation VLO-4.3.2 (January 2018) * Fixed issue with default conjunction operator VLO-4.3.1 (December 2017) * Fixed issue with Ajax response to search form request VLO-4.3.0 (December 2017) * Solved issue of going to simplified search page when going back from a record page * The order of selection is reflected in the facets listed in the 'breadcrumbs' * The record page shows "similar records" * The 'all facet values' dialogue now has an option to filter by first letter and a redesigned layout * Additional events are tracked with Piwik * Solr client and backend upgraded to version 7.1 * Solr index size reduced by not storing full text content for retrieval * The 'beta' build profile has been renamed to 'docker' and contains more VloConfig properties for (runtime) filtering VLO 4.2.1 (August 2017) * Parallel processing during import and caching improvements * Fixed detecting (conceptLink) context for attribute XPaths * Improved performance when reading self links from files (for hierarchy processing) VLO 4.2.0 (July 2017) ## New and improved features ## * The 'all facet values' dialogue now supports multi-value selection * Integration of the Virtual Collection Registry with the VLO * Better support for multilingual values, with priority for English content. This is used to display English record titles in headers, but show alternative values in other languages in the details. * Scroll to top of search results when navigating to next or previous page * "License type" (PUB/ACA/RES) is stored separately from other availability information, and any explicit values linked to this concept in metadata override any derived values * Support for mapping based on vocabulary value URIs from the CLARIN vocabulary service * The maximum file size for processed CMDI records has been increased to 50MB * Piwik improvements: tracking of in-page events and registering canonical page URLs * A 'favicon' was added * System administration: placeholders in VloConfig.xml for dockerised environments ## Bug fixes ## * Mapping of different languages that have the same label * "Search page for this record" broken for 'hdl:' URIs * Do not concatenate landing pages if multiple found * Unresolved URLs are sent to LRS with resolution attempt VLO 4.1.0 (April 2017) ## Web application enhancements and additions ## * Multiple values can be selected (OR/AND) for the facets * No facets are hidden if there are only a few left * The "Data provider" facet has been renamed to "Metadata source" * Collection names are shown below record titles in the search results * English descriptions are shown first in search results and the record page * Records with only one resource have this resource featured more prominently * Better pagination in the 'all facet values' view * The help page has been extended and updated, and made easier to find * Improved indexability by search engines * Base styling is imported from the CLARIN base style, making use of its distribution mechanism through Maven artifacts deployed to Nexus. * Added icons for public domain mark and "no copyright" right statements * The icons for resource types were replaced with clearer icons from fontawesome.io, and 'compressed archive' was added as a resource class with its own icon ## Web application fixes ## * Fixed tree expanding issues in metadata hierarchy display * Fixed display issues for non-ASCII characters in facet values * Fixed parsing issues with links in descriptions and other fields * Fixed highlighting of search terms in search results and on the record page * Relative links in records no longer lead to invalid resource links * Resource links on the record page always get a label ## Import and mapping improvements ## * Facet mapping and normalisation definition can be sourced from an external location * Processing of hierarchies can be enabled and disabled for individual metadata sets * Mapping definitions have been extended & improved for licences/availability * Improved mapping for the "Song" profile (Meertens Liederenbank) * Reduced load on system storage when importing large collections * Improved importer performance VLO 4.0.2 (December 2016) * Updated mapping for licence and availability information * Updated national project mapping * Fixed occurence of multiple availability level 'tags' (PUB/ACA/RES) * 'Resource title' concept preferred over 'resource name' for 'name' field * Removed 'scoll down to see all records' behaviour VLO 4.0.1 (August 2016) * Fetching external fonts from https locations, preventing browser warnings/issues * Fixed mapping of national project from collection display name * Removed redundant XPaths from mapping VLO 4.0.0 (July 2016) * VLO importer supports CMDI 1.2 instead of CMDI 1.1 * Field values can be extracted from attributes with concept link * Extended mapping of the 'keyword' and 'rightsHolder' facets * Redesigned front end using bootstrap and the common CLARIN style * Added a link to process resources via the Language Resource Switchboard * Fixed facet value count issues when selecting availability level(s) * Proper 404 response for records that do not exist (anymore) VLO 3.4.1 (April 2016) * Fixed a critical querying performance issue * Fixed the sitemap generator * Small fixed in the icons * Included a report generator VLO 3.4 (March 2016) * Major revisions and improvements to the mapping of availability, licence and access information * Prominent presentation of availability and licence information in search result and the record page * Dedicated facet value selector for main availability levels (PUB/ACA/RES) * Added legal information about VLO to about page * More references to the landing page and rephrasing of label 'original context' * Visual indication of search activity * More recently imported records appear first * More files included in hierarchies * Uniform mapping/normalisation definition format * Improved Solr querying performance * Upgraded front end to Wicket 7 * Improved Piwik reporting and, also for AJAX requests, and better configuration * Fixed issue with indexing of files in metadata hierarchies * The 'continent' facet was removed from the search interface * The importer can now request up to 4 gigabytes of heap space * A sitemap generator has been added (separate tool than can be run after import to generate a sitemap for search engines) VLO 3.3.2 (November 2015) * Fixed issue with hierarchy links to unavailable records * Visual indication that a search query is being asynchronously * Collection records with a large number of children only load the first few, allowing the user to load more if desired * Search terms are now highlighted in the search results as well VLO 3.3.1 (September 2015) * Ranking based on relevance with boosts for matches in certain fields and on basis of record properties such as hierarchy level and presence of name, description and resource references , * Support for advanced search via query syntax, with instructions accessible via web application , * Metadata hierarchies are processed on import and interactively presented in the web application * Further exlusion of actor languages in the 'language' facet * Hiding of language code prefixes in multi-lingual description fields * Addition of importer option to only import specific data roots * Extended language variants name map with all languages that have multiple names in ISO 639-3 Known issues: * In some cases, it may happen that hierarchical relations to records that do not appear in the index are stored VLO 3.2.2 (August 2015) * Fixes an exception occurring when clicking the 'Report' link on the main page VLO 3.2.1 (July 2015) * Graceful handling of requests for all values of nonexistent facets * Included the VLO iframe page for the CLARIN-D homepage * Fixed a potential file descriptor leak in the VLO importer * Fixed appearence of 'jsessionid' parameter in the URL VLO 3.2 (June 2015) Mapping: * Added search facet "Availability" based on licensing information * Non-English language names are ignored (if language code is not used) * Mapping of language name variants to canonical names (OLAC) * Mapping of language tags without olac-language attribute (OLAC) Search interface: * Added tooltips to facets with facet descriptions * Search term can be removed without removing facet selection in 'bread crumbs' * Search result ranking by relevance Record page: * Paging of resources in record page * Improved handle resolution for resources in record page * Fixed handle link in record page for cases that contain an '@' character * Link to language info page uses new URL scheme Web application general: * VLO web pages contain a canonical URL link (improving search engine behaviour) VLO 3.1 (March 2015) * Added the 'license' facet * More fields get indexed for the autocomplete/suggestion function in the search box * Fixed an issue with resolving resource handles * Mapping improvements: * Fallback to fields defined by pattern (path) if no value is found in a field with a matching concept link * Automatic curation of values in the 'organisation' facet * Better support for RFC1766 codes (such as 'en_US' and 'nl_NL') * The 'language' facet is replaced by an (internal) representation based on language code if applicable * Regular expressions for national project mapping * Content language is stored for descriptions * Upgraded a number of dependencies including Solr, Wicket and Spring to a more recent version * VLO importer logs to separate log directory * A number of changes in VloConfig.xml; see UPGRADE instructions for details VLO 3.0.1 (June 2014) * DC-3786 (application type) was added to facet 'resourceClass' * Fixed highlighting of search terms that contain unicode characters * Fixed incorrect display of value count for values written in right-to-left script * Added a 'description' metadata element to the page header * Small cosmetic fixes * Renamed 'permalink' to 'link' VLO 3.0 (May 2014) * Made separate collection feature optional * Fixed empty record page title issue * Improved compatibility with old bookmarks * Removed mapping for http://purl.org/dc/terms/language datacategory see * Styling of CMDI to HTML transormation output * Added simple search page to breadcrumbs VLO 3.0-beta3 (May 2014) * Added paging to the 'all facet values' list * Removed duplicate VloConfig.xml in distribution * Add 'busy' indicators to a number of AJAX action links * Hidden previous/next links on record page if result set has only one record * Added a search icon to the facet filter box * Fixed sometimes chaotic layout of collection facet items * Permalink link is now a button (to prevent right click/copy url) * Migrated from CSS to LESS (converted to compressed CSS compile time) VLO 3.0-beta2 (May 2014) * Added the "_selfLink" field to fix FCS aggregator connection * Removed simple search selection ‘leave this page’ dialogue * Included record name in page title for record pages VLO 3.0-beta (April 2014) * Added a 'simple search' front page * Added expansion of search results items to see more details * Added federated content search support * Added links to 'search pages' if provided by a record * Added an 'About' page * Added links to help and error report form * Added support for themes, included a CLARIN-D theme (enabled by query parameter theme=clarin-d) * Added a filter or 'quick search' input to facet selection panels * Added filtering on minimal number of occurrences in all facet values popup/page * Added an advanced search options box with the option to filter on FCS option * Added resolving of handles of resources to show the actual filename * Added support for UBN:NBN * Added a link to the CLARIN language info page for language values of records * Resource details now shown in tooltip instead of separate page section * Lazy rendering of the 'all metadata fields' view (generated by CMDI-to-HTML stylesheet) * Improved error handling * Numerous fixes and small enhancements to the user interface and code base * Solr configuration: data directory is configured through java system property 'solr.data.dir', which needs to be configured in the Tomcat instance VLO 3.0-alpha (March 2014) * Reimplemented Wicket front-end see * Upgraded to Solr 4.6.0 * Added application monitoring via JavaMelody at /monitoring * Added/replaced context params * eu.clarin.cmdi.vlo.* * (externalConfig has been removed) * VloConfig changes * Removed list length attribute (e.g. ) * Added collectionFacet * Added config of ignored and technical fields VLO 2.18.1 (February 2014) * Updated national projects mapping for LINDAT/CLARIN (by including r4343) Beta release 2.18 (January 2014) * Upgraded to Wicket 6 * Added support for a separate facet concepts file used for testing only * Configured mount points for pages (URLs changed as a result) * Added configuration parameters 'pagesInApplicationCache' and 'sessionCacheSize' to control the size of the Wicket page cache Beta release 2.17 (November 2013) Added facet overview to the search bar Added tooltips to facets (ticket 404) Added modality facet (ticket 422) Increased the number of results to 30 (ticket 423) Added support for fulltext search on header (441) Beta release 2.16 (October 2013) Fixed broken web links (#311, #420) Fixed indexing problems (#387) Several improvement of the facet mapping (#285, #397, #407, #408, #418) Improvement of user interface (#391, #416) Improvement of error handling (importer, solr connection) Split description meta data attribute Added support for data from Universiteit Utrecht Production release 2.15 (August 2013) No changes compared to the beta release. Beta release 2.15 (July 2013) Repaired the incorrect reference to profiles, and made the connection to the solr server more tolerant. Files without resources will be shown in the web application if and only if there is a link to a landing page. Beta Release 2.14 (June 2013) Support for theming was added, as were some new facet mappings, and the interface to the Federated Content Search was implemented in the form of a link - not as a search box like it was originally foreseen. Beta release 2.13 (May 2013) A new package, eu.clarin.cmdi.vlo.config was added taking care of the web application and importer's configuration. Spring is no longer used for configuration; it was replaced by the Simple framework. Both the importer and the web application use the same base file for configuration. This file refers to external resources like for example the nationalProjectsMapping.xml file. The base VloConfig.xml file that is included in the /src/main/resources directory of the package, can be replaced by an external instance. Additionally, the web application's context file can be used to overrule the solrUrl parameter defined in the packaged or external configuration file. Added the nationalProjectsMapping file to the default configuration. This means that it is no longer necessary to instance of the file external to the package. By the default the importer and web application will look at the packaged instance. Landing page support on the result page was added; ticket 257. Heap memory consumption of the importer was limited. A parameter was added to to be able to tune the size of the buffer of documents waiting to be deposited in the database. Repackaging was carried out. From version 2.13 the web application resides outside the importer package. Next to these packages the solr package is still there, and apart from the addition of a hidden facet supporting the landing page, it has not been modified. In a future release the VLO base functions will be split off from the importer package. Release VLO 2.8 (23 may 2012): Many small fixes. Streamlined the deployment procedure. Added facet for the component profile (hidden facet, not shown in interface) for future use. Added feedback option. Removed the dependency on external xml stylesheets (caused a large-scale outage for spring-users around the 21st of may). Release VLO 2.5 (22 march 2012): Lot's of bugfixes and small enhancements. Release VLO-2.3.1 (28 June 2011): Disabled handleResolving to get the resource name on showResult panel, see made ticket to fix it: http://trac.clarin.eu/ticket/136. Did not work on clarin server. Release VLO-2.3 (10 June 2011): Most notable change is the importing now is based on conceptlink mapping, allowing the importer to automatically parse new flavours of cmdi. http://trac.clarin.eu/ticket/105 Create import based on conceptlinks http://trac.clarin.eu/ticket/129 Rename origin to collection http://trac.clarin.eu/ticket/131 ShowResultPage should give proper error when result can not be loaded http://trac.clarin.eu/ticket/98 Record with duplicate id does not show http://trac.clarin.eu/ticket/84 Some links are changed from orginal in the result page http://trac.clarin.eu/ticket/27 Show list of resources (Written or Media etc...) in Show result page Release VLO-2.2 (28 Januari 2011): http://trac.clarin.eu/ticket/93 Scaling of images fixed (and typo in image resolved) http://trac.clarin.eu/ticket/92 Breadcrumb to original vlo page added http://trac.clarin.eu/ticket/63 Frontpage layout changed http://trac.clarin.eu/ticket/55 Preprocess of imdi files in place Created correct links from original vlo page to new faceted browser. Release VLO-2.1 (13 Januari 2011): http://trac.clarin.eu/ticket/54 Change columnheaders of results http://trac.clarin.eu/ticket/26 add prev/next links to show result page http://trac.clarin.eu/ticket/42 capitalization http://trac.clarin.eu/ticket/62 10 facet values instead of 5 http://trac.clarin.eu/ticket/43 origin for LRT should be CLARIN LRT inventory http://trac.clarin.eu/ticket/37 extract proper country names from country code facets http://trac.clarin.eu/ticket/38 extract proper language names from language code facets http://trac.clarin.eu/ticket/60 remove Unspecified and Unknown from initial facet list http://trac.clarin.eu/ticket/46 open in original context for the LRT inventory http://trac.clarin.eu/ticket/29 Link to correct archives based on the metadata http://trac.clarin.eu/ticket/45 make all links clickable http://trac.clarin.eu/ticket/34 make partner images clickable - Added resourceType facet (still todo for OLAC data) - Added resource list and links to download resources (still todo show names for handles) Release VLO-2.0 (2 December 2010): New implementation of the original vlo facetted browser using SOLR as a backend and the Wicket framework for the java frontend. We now support CMDI metadata only. - Initial version working and performing very nicely.