rdfapi-php-interest

[Rdfapi-php-interest] bNode and GENERAL_PREFIX_BASE variable

[Roberto SL <ref...@gm...>]

Hi all,
I am testing the RDF PHP API because it is my intention to integrate it
in an open source project.

However, while testing I have the following issues:

1. Error: Resource expected as predicate, no blank node allowed. in
xx/xx/Statement.php on line 66

Here is the code taken from the tutorial about MemModel
(http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/tutorial/usingthemodelapi.htm ) and which is generating that error:

<?php

define("RDFAPI_INCLUDE_DIR", "../rdfapi-php/api/");
include(RDFAPI_INCLUDE_DIR . "RdfAPI.php");

$someDoc = new Resource ("http://www.example.org/someDocument.html");
$creator = new Resource ("http://www.purl.org/dc/elements/1.1/creator");

$statement1 = new Statement ($someDoc, $creator, new Literal ("Radoslaw
Oldakowski"));

$model1 = ModelFactory::getDefaultModel();

$model1->add($statement1);

$model2 = ModelFactory::getDefaultModel();
$model2->add(new Statement($someDoc, new
Resource("http://www.example.org/myVocabulary/title"), new Literal("RAP
tutorial")));
$model2->add(new Statement($someDoc, new
Resource("http://www.example.org/myVocabulary/language"), new
Literal("English")));

$model1->addModel($model2);

$bNode = new BlankNode($model1);

$model1->replace(NULL, NULL, new Literal("Radoslaw Oldakowski"),
$bNode);

$model1->add(new Statement($bNode, $VCARD_FN, new Literal("Radoslaw
Oldakowski"))); 
$model1->add(new Statement($bNode, $VCARD_EMAIL, new
Literal("ra...@gm...")));

echo "\$model1 contains " .$model1->size() ." statements";

echo "<b>Output the MemModel as HTML table: </b><p>";
$model1->writeAsHtmlTable();

$model1->saveAs("model1.rdf", "rdf");
$model1->saveAs("model1.n3", "n3");

?>

2. I have noticed that beside the GENERAL_PREFIX_BASE variable there is
a number which derives from . $this->m_nextAutomaticPrefixIndex
specified in the RdfSerializer.php .

Why there is that number and is it possible to disable it?

Thanks again,

RSL

Re: [Rdfapi-php-interest] bNode and GENERAL_PREFIX_BASE variable

[Richard C. <ri...@cy...>]

Hi Roberto,

Concerning the first part of your mail: The VCard vocabulary must be  
included or the tutorial code won't work:

On 17 Jun 2006, at 14:55, Roberto SL wrote:
> 1. Error: Resource expected as predicate, no blank node allowed. in
> xx/xx/Statement.php on line 66
>
> Here is the code taken from the tutorial about MemModel
> (http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/tutorial/ 
> usingthemodelapi.htm ) and which is generating that error:
>
> <?php
>
> define("RDFAPI_INCLUDE_DIR", "../rdfapi-php/api/");
> include(RDFAPI_INCLUDE_DIR . "RdfAPI.php");

include(RDFAPI_INCLUDE_DIR . "vocabulary/VCARD.php");

It works if you add this line.

The documentation should of course mention this. I've added this line  
to the tutorial in CVS. I think Tobias will publish it to the website  
with the next release.

Best,
Richard

Re: [Rdfapi-php-interest] bNode and GENERAL_PREFIX_BASE variable

[Richard C. <ri...@cy...>]

On 17 Jun 2006, at 14:55, Roberto SL wrote:
> 2. I have noticed that beside the GENERAL_PREFIX_BASE variable  
> there is
> a number which derives from . $this->m_nextAutomaticPrefixIndex
> specified in the RdfSerializer.php .
>
> Why there is that number

When RAP serializes an RDF model to RDF/XML, it needs namespace  
declarations for all RDF properties that are used in the model. If  
there are no declarations for some properties, then RAP makes up its  
own declarations and uses prefixes like ns0, ns1 and so on. There can  
be any number of different namespaces in any RDF model, and so RAP  
needs to number them because each needs its unique prefix.

By the way, you can declare your own namespaces using $model- 
 >addNamespace($prefix, $uri).

> and is it possible to disable it?

Well, just hack the code. But why would you want to do that?

Best,
Richard


>
> Thanks again,
>
> RSL
>
>
>
>
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