Mastering Structured Data on the Semantic Web by Sikos Ph.D. Leslie F

Author:Sikos, Ph.D., Leslie F.
Language: eng
Format: epub
ISBN: 978-1-4842-1050-5
Publisher: Apress
Published: 2015-06-30T04:00:00+00:00

Tabulator

Tabulator is W3C’s Semantic Web browser and editor available as a web application and a Firefox plug-in at http://www.w3.org/2005/ajar/tab. It can display Linked Data in various visualization formats. Tabulator contains an RDF store written in JavaScript. The tool has two modes: Exploration Mode and Query Mode. In Exploration Mode, it displays a table of predicate-object pairs, which might also include nested properties. One of the exploration options is Outline Mode, with which the user can explore resources by opening the branches of the tree structure. The Outliner Mode addresses the limitations of the circle-and-arrow diagrams used by RDF visualizers, such as IsaViz, that are inefficient for large amounts of data with many nodes and many different properties. In Outliner Mode, the user can also perform graph-matching queries by selecting a number of fields and pressing the Find All button, when the Linked Data graph is searched for subgraphs matching the given fields. Instances are listed of a dedicated pane for each class. Tabulator can also show the network activity involved in retrieving the opened document, human-readable content, and RDF.

When used as an editor, Tabulator supports three editing options in Outline Mode: object modification, adding a new object with an existing predicate, and adding a new predicate-object pair to an existing subject. To modify a cell that contains a literal value, you click once (or press Enter) when the cell is highlighted, so that the field becomes editable. Once the editing is done, you just press Enter. If the object of the predicate-object pair is not a literal value but a URI identifier, you can select it by name or by drag-and-drop. Tabulator always tries to display a name rather than a URI whenever possible (for example, a textual description rather than rdfs:label or dc:title). When the predicate is not present, a new fact to the property or object table can be added by clicking the blue plus symbol displayed to the left, at the end of the table. When the new pair is added, you will be prompted with an auto-completion box for the predicate, while the object can be selected as usual.

When you perform a query for a subgraph pattern, a table is generated. Inserting a new row creates a new subgraph that matches the query. When a cell value is edited, a statement is removed and another inserted in the same document.

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