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---+ Virtuoso Linked Data Views for the Oracle Human Resources Sample Database
This document details the steps required for building RDF-based Linked Data views of schema objects in Oracle data sources, using the sample Human Resources database.
%TOC%
---++ Prerequisites
* An instance of [[http://virtuoso.openlinksw.com/download/][Virtuoso Commercial Edition]]. (Open Source Edition does not support Linked Data Views of remote data.)
* <i><b>Note:</b> The <code>[[http://docs.openlinksw.com/virtuoso/databaseadmsrv.html#ini_URIQA][URIQA:DefaultHost]]</code> Virtuoso configuration parameter must be set to the appropriate fully-qualified hostname (<code>CNAME</code>) and port number before creating any Linked Data Views, to enable URI dereference.</i>
* [[VirtOracleLinkingObjects][Oracle tables linked into the Virtuoso instance]].
* An ODBC Driver for Oracle, with the client components installed on the same host as the Virtuoso instance.
---++ Steps
---+++ Preparation
1 Load the Virtuoso Conductor (<code>http://<cname>:<port>/conductor</code>, e.g., <code>[[http://demo.openlinksw.com:8890/conductor][http://demo.openlinksw.com:8890/conductor]]</code>) in your web browser.
1 Log in as any user with DBA privileges, such as the default <b><code>dba</code></b>.
1 Drill down to the <b>Database</b> -> <b>Linked Data Views</b> tab.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_01.png" style="wikiautogen"/>%BR%%BR%
1 Select the <b>Database Name Qualifier</b> (e.g., "<code>HR</code>") that exposes the <code>TABLEs</code> and <code>VIEWs</code> for this exercise.
1 Enter the <b>Base URL</b> beneath which the tables and their data will be found, after Linked Data View generation and publication (e.g., <code>[[http://demo.openlinksw.com:8890/HR][http://demo.openlinksw.com:8890/HR]]</code>).
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_02.png" style="wikiautogen"/>%BR%%BR%
1 Select the specific <code>TABLEs</code> and <code>VIEWs</code> containing the data you want to publish as Linked Data.
---+++ Option A - One-Click Generation and Publication
1 Click <b>Generate & Publish</b> to automatically generate the Linked Data Views.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_03.png" style="wikiautogen"/>%BR%%BR%
1 Click <b>Execute</b> and Virtuoso will:
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_08.png" style="wikiautogen"/>%BR%%BR%
1 Apply the generated declarations (instance data and ontology) to your Virtuoso instance.
1 Publish / Deploy declarations that expose the Wizard-generated Rewrite Rules and associated endpoints.
---+++ Option B - Customized Generation and Publication
1 Click <b>Generate via Wizard</b> to customize the automatically generated Linked Data Views before publication.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_03.png" style="wikiautogen"/>%BR%%BR%
1 At this point, you are presented with the option to edit your column selection. For example, select the "Edit" link for table <code>HR..COUNTRIES</code>.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_04.png" style="wikiautogen"/>%BR%%BR%
1 If you want images or other binary data in MIME formats to be revealed as anything other than generic "binary objects", you must map these large <code>varbinary</code> types
to the appropriate MIME types like <code>image/gif</code>. To do so, select the <b>Edit</b> link for <b>Binding/MIME Type</b> of the relevant table columns.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_05.png" style="wikiautogen"/>%BR%%BR%
You can:
* Leave the <b>Binding/MIME Type</b> literal; or
* Set to skip, such that the column will not be used in RDF generation; or
* Select the <b>binary object</b> value in order for the column to be referenced as binary.
1 After finishing with your changes click the <b>Save</b> button, or cancel the changes and go back by clicking the <b>Cancel</b> button.
1 Make sure you click the "Next" button.
1 At this point, the <b>Linked Data View Definition</b> form will let you <b>Select Generation Targets</b> options:
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_06.png" style="wikiautogen"/>%BR%%BR%
* Data Source Ontology Mappings
* Instance Data View Mappings
* [[http://www.w3.org/TR/void/][VoID]] statistic
1 Make sure you click the "Next" button.
1 Based on your selections in the prior form, the <b>Linked Data View Definition</b> <b>Deployment Options</b> form will be offered:
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_07.png" style="wikiautogen"/>%BR%%BR%
* Data Source Ontology Rules
* Instance Data Rules
1 Select the desired option(s) and click the "Prepare to Execute" button which unveils a generated Instance Data and/or Ontology form.
1 Click the <b>Execute</b> button and Virtuoso will:
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_08.png" style="wikiautogen"/>%BR%%BR%
1 Apply the generated declarations (instance data and ontology) to your Virtuoso instance.
1 Publish / Deploy declarations that expose the Wizard-generated Rewrite Rules and associated endpoints.
---++ Results
The Conductor will display a page like this --
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_09.png" style="wikiautogen"/>%BR%%BR%
You can now --
* Click on one of the <b>Instance Data</b> Sample links to view some of the deployed Linked Data views.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_10.png" style="wikiautogen"/>%BR%%BR%
* Click on the <b>Statistics Data (<nop>VoID Graph)</b> link to view the <nop>VoID Statistics.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_11.png" style="wikiautogen"/>%BR%%BR%
* Click on the <b>Ontology</b> link to view the ontology information.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtRDFViewUI_12.png" style="wikiautogen"/>%BR%%BR%
---++ Related
* [[VirtRDFViewsOracleHrDb][RDF-based Linked Data View atop Oracle using the demonstration 'Human Resources' database]]
* [[VirtRDFViewsOracleHrDbDemo][Live Demo]]
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![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)