This HTML5 document contains 38 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

Subject Item

n9:this

foaf:made

n2:VirtSparqlCxmlDETs

Subject Item

n8:this

sioc:creator_of

n2:VirtSparqlCxmlDETs

Subject Item

n13:item

n14:services_of

n2:VirtSparqlCxmlDETs

Subject Item

n18:this

sioc:creator_of

n2:VirtSparqlCxmlDETs

Subject Item

n4:VOS

sioc:container_of

n2:VirtSparqlCxmlDETs

atom:entry

n2:VirtSparqlCxmlDETs

atom:contains

n2:VirtSparqlCxmlDETs

Subject Item

n2:VirtSparqlCxmlImport

sioc:links_to

n2:VirtSparqlCxmlDETs

Subject Item

n2:VirtSparqlCxmlFacetPivotBridge

sioc:links_to

n2:VirtSparqlCxmlDETs

Subject Item

n2:VirtSparqlCxmlPivotViewer

sioc:links_to

n2:VirtSparqlCxmlDETs

Subject Item

n2:VirtSparqlCxmlDzcs

sioc:links_to

n2:VirtSparqlCxmlDETs

Subject Item

n2:VirtSparqlCxmlDETs

rdf:type

atom:Entry sioct:Comment

dcterms:created

2017-06-13T05:42:37.020657

dcterms:modified

2017-06-29T07:40:47.303005

rdfs:label

VirtSparqlCxmlDETs

foaf:maker

n9:this n21:this

dc:title

VirtSparqlCxmlDETs

opl:isDescribedUsing

n6:rdf

sioc:has_creator

n8:this n18:this

sioc:attachment

n15:jpg n16:jpg n17:jpg

sioc:content

---+Pivot Collections (Part 7) ---++Contents Part 1: [[VirtSparqlCxml][Introduction]] Part 2: [[VirtSparqlCxml][SparqlCxml]] Part 3: [[VirtSparqlCxmlDzcs][SparqlCxml Deep Zoom Collections]] Part 4: [[VirtSparqlCxmlPivotViewer][PivotViewer]] Part 5: [[VirtSparqlCxmlImport][Importing CXML]] Part 6: [[VirtSparqlCxmlFacetPivotBridge][Facet Pivot Bridge]] Part 7: DETs : Persisting SPARQL Query Results to DAV * [[#AncSparqlCxmlDETs][DETs : Persisting SPARQL Query Results to DAV]] * [[#AncSparqlCxmlDETsOverview][Overview]] * [[#AncSparqlDETSupport][SPARQL Endpoint Support for DETs]] * [[#AncEnablingSparqlDETs][Enabling /sparql DETs]] Part 8: [[VirtSparqlCxmlFAQs][Frequently Asked Questions (FAQs)]] Part 9: [[VirtSparqlCxmlGlossary][Glossary]] --- #AncSparqlCxmlDETs ---++DETs : Persisting SPARQL Query Results to DAV #AncSparqlCxmlDETsOverview ---+++Overview Virtuoso's Dynamic Extension Types (DETs) provide a powerful mechanism for generating dynamic hypermedia resources that are akin to materialized views from database queries. DETs are useful in cases where clients do not support the requisite access mechanism for a specific data source but, because most modern operating systems are <nowiki>WebDAV</nowiki> compliant, are able to load a file from <nowiki>WebDAV</nowiki>. In situations like this, Virtuoso allows you to create an HTTP accessible resource from a query that's then exposed as a file in a <nowiki>WebDAV</nowiki> folder. <nowiki>WebDAV</nowiki> clients, for instance Windows Web Client, can connect to <nowiki>WebDAV</nowiki> storage and access this resource as if it was a plain local file. These resources may be temporary or long lived. #AncSparqlDETSupport ---+++SPARQL Endpoint Support for DETs By default, Virtuoso's /sparql endpoint can only send query results back to the client. This can be inconvenient if the result needs to be accessible to programs like file managers and archivers. The solution is to let the endpoint create "dynamic" resources in DAV storage. To this end, Conductor's /sparql UI exposes Virtuoso's DET capability through options which allow you to save SPARQL query results to <nowiki>WebDAV</nowiki> and serve the results without needing to re-execute the query. Any of the supported SPARQL result set serialization formats can be used to write the results to file. #AncEnablingSparqlDETs ---+++Enabling /sparql DETs The easiest way to enable this feature is through Conductor: Go to the 'System Admin' &gt; 'User Accounts' tab and choose the 'Edit' option for Login name 'SPARQL' * Set the 'DAV Home Path' to /DAV/home/SPARQL/ (include the leading and trailing slashes) and click the 'create' checkbox * Set the 'Default Permissions' on this folder to allow the required access, e.g. set +r for public or a specific group * Change the 'User type' to 'SQL/ODBC and <nowiki>WebDAV</nowiki>' Open the newly created DAV/home/SPARQL folder using Conductor's <nowiki>WebDAV</nowiki> browser * Create a new folder named 'saved-sparql-results'. (Use the folder icon at the top of the dialog). * Set the 'Owner' to 'dav' * Set the 'Folder type' to 'Dynamic Resources' * Set the folder permissions to allow public or group access <verbatim> The net effect of the above steps is: 1. The "SPARQL" account under which the /sparql service runs is granted access to DAV (by setting U_DAV_ENABLE=1 in table DB.DBA.SYS_USERS) 2. A DAV home directory /DAV/home/SPARQL/ is created for the SPARQL account and the path saved in the U_HOME field of table DB.DBA.SYS_USERS 3. A subdirectory named "saved-sparql-results" is created with DAV Extension Type "DynaRes" </verbatim> Once enabled, the /sparql UI will show additional options for saving query results, as depicted below: <div> <img src="%ATTACHURLPATH%/sparql_save_as_det.jpg" style="wikiautogen"/> </div> When a SPARQL result has been successfully saved to DAV, Conductor displays a confirmation dialog: <div> <img src="%ATTACHURLPATH%/det_create_success.jpg" style="wikiautogen" /> </div> and the generated dynamic resource can be seen in <nowiki>WebDAV</nowiki>: <div> <img src="%ATTACHURLPATH%/sparql_det_webdav_view.jpg" style="wikiautogen"/> </div>

sioc:id

508b2825ce40e3601931937b7e8f7555

sioc:link

n2:VirtSparqlCxmlDETs

sioc:has_container

n4:VOS

n14:has_services

n13:item

atom:title

VirtSparqlCxmlDETs

sioc:links_to

n2:VirtSparqlCxml n2:VirtSparqlCxmlGlossary

atom:source

n4:VOS

atom:author

n9:this

atom:published

2017-06-13T05:42:37Z

atom:updated

2017-06-29T07:40:47Z

sioc:topic

n4:VOS