Tag Archive for 'rdf'

Exporting Entities using OSF for Drupal (Screencast)

This screencast will introduce you to the OSF for Drupal features that let you export Drupal Entities in one of the following supported serializations:

  • RDF+XML (RDF in XML)
  • RDF+N3 (RDF in N3)
  • structJSON (Internal OSF RDF serialization in JSON)
  • structXML (Internal OSF RDF serialization in XML)
  • ironJSON (irON serialization in JSON)
  • commON (CSV serialization to be used in spreadsheet applications)

I will show you how you can use OSF for Drupal to export entire datasets of Entities, or how to export Entities individually. You will see how you can configure Drupal such that different users roles get access to these functionalities.

I will also briefly discuss how you can create new converters to support more data formats.

Finally, I will show you how Drupal can be used as a linked data platform with a feature that makes every Drupal Entities dereferencable on the Web1. You will see how you can use cURL to export the Entities‘ descriptions using their URI in one of the 6 supported serialization formats.


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  1. OSF for Drupal follows the Cool URIs for the Semantic Web W3C’s interest group notes

Configuring and Using OSF Ontology (Screencast)

This screencast will quickly introduce you to ontologies, and will explain you what are their rules in the Open Semantic Framework (OSF).

You will see how you can manage ontologies in OSF using the OSF for Drupal web interface. You will be able to import, create, update, delete and export ontologies. You will see how you can search within imported ontologies, how you can manage their permissions.

Finally you will see how you can manage the ontologies themselves: how you can create, update and delete classes, properties and named individuals using the Web user interface.


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Managing Resource Type Entities (Screencast)

In this screencast, you will discover how you can use the OSF for Drupal user interface to browse, filter and search for Resource entities that have been indexed in Open Semantic Framework (OSF) datasets. You will see how you can use it to manage what you want to expose on your Drupal portal.

Then you will see how you can create, update, delete and export Resource entities using Drupal.

Finally you will discover the revisioning system, and the revisioning user interface that is available to the Drupal administrators.


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Configuring and Using OSF FieldStorage (Screencast)

This screencast introduces you to another one of the most important OSF for Drupal connector: the OSF FieldStorage module. What this module does is to create a new FieldStorage type for Drupal7. It enables Drupal7 to save the values of its Content Types fields into another storage system than the default one (i.e MySQL in most of the cases).

Because of the way that the Field system has been designed in Drupal7, it is possible to save the values of different fields that compose the same Content Type bundle into different field storage system. For example, if your Content Type bundle is composed of 10 fields, then 4 of them could be saved into MySQL and 6 of them into OSF.

The main purpose of the OSF FieldStorage module is to be able to save Drupal local Content Type information into OSF. What that means is that all your Drupal7 local content then become accessible, manageable and manipulatable using the 27 Open Semantic Framework (OSF) web services endpoints. Your local Drupal content can then be shared with other Drupal instances that could use OSF for Drupal to connect to that same OSF instance and seamlessly republish/re-purpose that local content from the other Drupal portal.

Here is the documentation of the architecture of this connector module.

This is the power of the OSF FieldStorage connector module. It supports the following Drupal features:

  1. Full FieldStorage API
  2. Entities caching
  3. Revisioning
  4. SearchAPI
  5. 29 field widgets
  6. Export feature in 6 formats

In this screencast, you will be introduced to Drupal7′s Field system. Then you will see how the OSF FieldStorage module creates a new FieldStorage type for Drupal7 and how it can be used. Then you will see how to configure the OSF FieldStorage module: to creating new Content Type fields that uses this osf_fieldstorage type, how to map these fields to RDF, how to use one of the 29 supported field widgets, etc.

Finally, you will see how you can synchronize existing Content Type pages (that was created before OSF for Drupal was installed on your Drupal instance) into a OSF instance.

 


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Configuring and Using OSF Entities (Screencast)

This screencast introduces you to one of the most important OSF for Drupal connector: the OSF Entities module. This module creates a new Entity Type called Resource. The description of these entities is managed directly into the Open Semantic Framework (OSF). All the calls to the core entity API function like: entity_load(), entity_save(), entity_create() and entity_delete() are operated with different calls to different OSF web service endpoints.

What this means for a Drupal developer is that they can use Drupal’s Entity API to manage instance records that are hosted remotely in a OSF instance. They don’t have to know how OSF works in order to take advantage of it. They just have to use the API they are used to use. This new Entity Type supports the following Drupal features:

  1. Full Entity API
  2. Entities caching
  3. Revisioning
  4. SearchAPI
  5. Templates selection with inference on their type
  6. 29 field widgets
  7. Export feature in 6 formats

The screencast introduces you to the following aspects of the OSF Entities module:

  1. Introduction to the architecture of the OSF Entities module
  2. Exposing the available entities in OSF into Drupal Bundles and Fields
  3. Browsing and searching for Resource entities
  4. Managing Resource Type bundles
  5. Introduction to the OSF Entity Reference field widget
  6. Creating and updating Resource entities

 


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This blog is a regularly updated collection of my thoughts, tips, tricks and ideas about my semantic Web researches and related software development.


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