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Browse visualisation example

Many vocabularies published in RVA have content available in SKOS format. If the current version of a vocabulary is defined as SKOS concepts, the vocabulary's view page displays them in a browse visualisation. The browse visualisation is an interactive representation of the vocabulary content that assists users in understanding a vocabulary and assessing it for use.

Tooltips show concept details

Hover over a concept's label to display a tooltip that shows the concept's IRI, description, and (if there is one) notation. If the vocabulary is published through the Linked Data API, the tooltip will also contain a link to bring up the resource view of the concept in the Linked Data API.

Navigating the hierarchy of broader and narrower concepts

A vocabulary's concepts may be arranged in a hierarchy of broader and narrower concepts. If so, the browse visualisation displays the hierarchy and allows users to navigate it.

The topmost concepts in the hierarchy are displayed down the left-hand side of the visualisation. If a concept has any narrower concepts, there will be a triangle to the left of the label, and the number of direct descendants ("children") will be shown in parentheses at the end of the label. Click either the triangle or the concept label to expand the next level of concepts. Click either the triangle or the label again to collapse the narrower concepts.

Showing/hiding all concepts


The Expand all and Collapse all buttons allow users to show and hide all of the concepts that are narrower than the topmost concepts. If a vocabulary has a large number of concepts, expanding or collapsing all concepts may take a few seconds.



The filtering functionality allows users to filter the visualisation to show only those concepts which match an entered query string. The filter searches across the label, description, and notation properties of each concept. After entering in a query string, there is no need to presst the Enter key, as the filtering process will automatically execute after a short pause in typing.

Once the filter has been applied, the system will show the total number of matches, and expand the hierarchy as necessary to show the location of all of the matched concepts. (Other concepts that are part of the hierarchy of a match, but which are not themselves matches, have their labels greyed out.) Where a match is made against the label of a concept, the matching text will be highlighted. Within the concept's tooltip, matches against the description and notation fields are not highlighted.

Click the orange X button next to the filter field to cancel the filtering.

Filtering example with matched concept labels



If the vocabulary contains concept notations, and the vocabulary's publisher has enabled it, the browse visualisation will offer a Sort by dropdown, which allows users to change the sort order of the concepts displayed in the visualisation.

Displaying notation values


If the vocabulary contains concept notations, and the vocabulary publisher has enabled it, the browse visualisation will offer a Show notations switch, which allows users to turn on and off the display of concept notations within concept labels. The switch is off by default. When switched on, the notations will be displayed before the concept label. Note: if a concept has a notation value, the value is always shown in the concept's tooltip, irrespective of the setting of this switch.


Polyhierarchies and duplicate concepts

Some of the vocabularies published in RVA are polyhierarchies. That means, the hierarchy of broader and narrower terms is not strictly tree-structured: within the vocabulary, there is at least one concept that has two (or more) broader concepts. In other words, there is at least one concept that appears in more than one place in the hierarchy. The tooltip for such a concept will include this indication:

Click the link Filter to all instances to apply a filter that matches all of the instances of the concept within the hierarchy.


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