wiki.dbpedia.org - Documentation

2009-08-15 15:55:08

Comparison for /Documentation of 2009-08-15 15:55:08 and 2009-11-09 17:20:51

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2009-08-15 15:54:12

Comparison for /Documentation of 2009-08-15 15:54:12 and 2009-08-15 15:55:08

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If you want to create your own dumps or work within your IDE or on the console, you should use extract_*.php. If you first want to learn how DBpedia extraction works, or test /debug new extractors, webStart.php might best suit your needs, as it gives you a comfortable web debug interface, similar to http://www4.wiwiss.fu-berlin.de/dbp-debug/. Make sure to download RAP – RDF API for PHP first if you want to use the web interface.
If you intend to produce separate output files for each Extractor, you will need an own ExtractionGroup for each extractor (as is done in the standard settings in extract_full.php). Finally you will need to run your ExtractionJob through an instance of an ExtractionManager.

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If you want to create your own dumps or work within your IDE or on the console, you should use start.php. If you first want to learn how DBpedia extraction works, or test /debug new extractors, webStart.php might best suit your needs, as it gives you a comfortable web debug interface, similar to http://www4.wiwiss.fu-berlin.de/dbp-debug/. Make sure to download RAP – RDF API for PHP first if you want to use the web interface.
If you intend to produce separate output files for each Extractor, you will need an own ExtractionGroup for each extractor (as is done in the standard settings in start.php). Finally you will need to run your ExtractionJob through an instance of an ExtractionManager.

2009-07-03 13:16:35

Comparison for /Documentation of 2009-07-03 13:16:35 and 2009-08-15 15:54:12

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To get the framework running on your local PC, it is recommended to start with the pre-configured extract_*.php files. You will find these in the DBpedia /extraction folder. The extraction code is available via Sourceforge SVN (do not download the release version at Sourceforge).

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To get the framework running on your local PC, it is recommended to start with the pre-configured files start.php or webStart.php. You will find these in the DBpedia root folder. The extraction code is available via Sourceforge SVN (do not download the release version at Sourceforge).

2008-07-07 23:14:29

Comparison for /Documentation of 2008-07-07 23:14:29 and 2009-07-03 13:16:35

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2008-07-07 23:12:02

Comparison for /Documentation of 2008-07-07 23:12:02 and 2008-07-07 23:14:29

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2007-09-04 19:02:10

Comparison for /Documentation of 2007-09-04 19:02:10 and 2008-07-07 23:12:02

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This pages describes the DBpedia information extraction framework. The framework consists of the interfaces: Destination, Extractor, Page Collection, and RDFnode, plus the essential classes Extraction Group, Extraction Job, Extraction Manager, Extraction Result, and RDFtriple.
The code extraction process is triggered via the ExtractionManager, which starts one or more ExtractionJobs. An ExtractionJob combines one or more ExtractionGroups with a PageCollection. The PageCollection is the data source, e.g., all articles from the Wikipedia SQL-Dump. ExtractionGroups consist of a Destination and one or more Extractors. Possible Destinations include your console, NTriple files and the web interface. Of course you are free to write your own destinations (e.g., databases, RDF/XML files).
Extractors are designed for single specific purposes, e.g., the InfoboxExtractor reads out information from Wikipedia Infoboxes. The ShortAbstractExtractor gets the first paragraph from an article and so on. DBpedia comes with extractors for many purposes already, though you are invited to add your own.

start(): Initializes the Destination (e.g., creates a new NTriple file). Is called once at the beginning of an ExtractionJob.

PageCollections are the data sources for extraction. A PageCollection loads the page source code for a specific language and one or more pages (Implementations: LiveWikipedia, DatabaseWikipedia).
URI, RDFliteral, and RDFblankNode are implementations of RDFnodes.
In addition, information such as datatype, language, and lexical form of

__construct($destination, $metadestination = NULL): $destination is an object of a class, implementing the interface Destination. $metadestination is an optional Destination, where meta information can be stored. It is mainly used by the InfoboxExtractor, which collects all predicate names in a metadestination.

RDFtriple combines a subject, a predicate, and an object, into an RDFtriple. You will usually create RDFnodes via RDFtriples, e.g. $subject = RDFtriple::URI("Resource Name"); as RDFtriple can add a common URI prefix for each triple.

static function literal($value, $datatype = null, $lang = null): Returns an RDFliteral. $value must be of datatype String; else an error message will be thrown, as $value will be serialized for NTriples and this only works with string variables. $datatype and $lang are optional parameters. $datatype is a string containing the (RDF-) datatype of $value, $lang the language.

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This pages describes the DBpedia information extraction framework. The framework consists of the interfaces: Destination, Extractor, Page Collection and RDFnode, plus the essential classes Extraction Group, Extraction Job, Extraction Manager, Extraction Result and RDFtriple.
The code extraction process is triggered via the ExtractionManager, which starts one or more ExtractionJobs. An ExtractionJob combines one or more ExtractionGroups with a PageCollection. The PageCollection is the data source, e.g. all articles from the Wikipedia SQL-Dump. ExtractionGroups consist of a Destination and one or more Extractors. Possible Destinations include your console, NTriple files and the web interface. Of course you are free to write your own destinations (e.g. databases, RDF/XML files).
Extractors are designed for single specific purposes. E.g. the InfoboxExtractor reads out information from Wikipedia Infoboxes. The ShortAbstractExtractor gets the first paragraph from an article and so on. DBpedia comes with extractors for many purposes already, though you are invited to add your own.

start(): Initializes the Destination (e.g. creates a new NTriple file). Is called once at the beginning of an ExtractionJob.

PageCollections are the data source for extraction. A PageCollection loads the page source code for a specific language and one or more pages (Implementations: LiveWikipedia, DatabaseWikipedia).
URI, RDFliteral and RDFblankNode are implementations of RDFnodes.
In addition informations such as datatype, language and lexical form of

__construct($destination, $metadestination = NULL): $destination is an object of a class, implementing the interface Destination. $metadestination is an optional Destination, where meta information can be stored. It is mainly used by the InfoboxExtractor, which collects all predicate names in a metdestination.

RDFtriple combines a subject, a predicate and an object to a RDFtriple. You will usually create RDFnodes via RDFtriples. E.g. $subject = RDFtriple::URI("Resource Name"); as RDFtriple can add a common URI prefix for each triple.

static function literal($value, $datatype = null, $lang = null): Returns a RDFliteral. $value must be of datatype String, else an error message will be thrown, as $value will be serialized for NTriples and this only works with string variables. $datatype and $lang are optional parameters. $datatype is a string containing the (RDF-) datatype of $value, $lang the language.

2007-08-23 11:21:49

Comparison for /Documentation of 2007-08-23 11:21:49 and 2007-09-04 19:02:10

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The DBpedia Information Extraction Framework

The DBpedia community uses a flexible and extensible framework to extract different kinds of structured information from Wikipedia.
The DBpedia information extraction framework is written using PHP 5. The framework is available from the DBpedia SVN (GNU GPL License).
This pages describes the DBpedia information extraction framework. The framework consists of the interfaces: Destination, Extractor, Page Collection and RDFnode, plus the essential classes Extraction Group, Extraction Job, Extraction Manager, Extraction Result and RDFtriple.

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Documentation of the DBpedia Extraction Framework

Preliminary Version: This document is not complete and might contain errors.
This pages describes the DBpedia extraction framework. DBpedia data extraction is written entirely in PHP 5. The framework consists of the interfaces Destination, Extractor, Page Collection and RDFnode, plus the essential classes Extraction Group, Extraction Job, Extraction Manager, Extraction Result and RDFtriple.

2007-08-23 11:19:35

Comparison for /Documentation of 2007-08-23 11:19:35 and 2007-08-23 11:21:49

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static function blank($label): Returns a RDFblankNode. $label must be string containing the Blanknode label.
static function URI($uri): Returns an URI. $uri is a string containing the URI.

2007-08-21 23:31:26

Comparison for /Documentation of 2007-08-21 23:31:26 and 2007-08-23 11:19:35

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static function literal($value, $datatype = null, $lang = null): Returns a RDFliteral. $value must be of datatype String, else an error message will be thrown, as $value will be serialized for NTriples and this only works with string variables. $datatype and $lang are optional parameters. $datatype is a string containing the (RDF-) datatype of $value, $lang the language.