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## PageContentSaveComplete hook
[#2974](https://github.com/SemanticMediaWiki/SemanticMediaWiki/issues/2974) Creating subobjects using the `PageContentSaveComplete` hook
```php
use Hooks;
use ParserOutput;
use SMW\ApplicationFactory;
use SMW\DataValueFactory;
use SMWContainerSemanticData as ContainerSemanticData;
use SMWDIContainer as DIContainer;
use SMW\DIWikiPage;
use SMW\DIProperty;
Hooks::register( 'PageContentSaveComplete', function( $wikiPage, $user, $content, $summary, $isMinor, $isWatch, $section, $flags, $revision, $status, $baseRevId, $undidRevId ) {
$applicationFactory = ApplicationFactory::getInstance();
$mwCollaboratorFactory = $applicationFactory->newMwCollaboratorFactory();
/**
* Initialize the ParserOuput object
*/
$editInfoProvider = $mwCollaboratorFactory->newEditInfoProvider(
$wikiPage,
$revision,
$user
);
$parserOutput = $editInfoProvider->fetchEditInfo()->getOutput();
if ( !$parserOutput instanceof ParserOutput ) {
return true;
}
$parserData = $applicationFactory->newParserData(
$wikiPage->getTitle(),
$parserOutput
);
// Subject Foo ...
$subject = $parserData->getSubject();
// Contains the wikitext, JSON or whatever is stored for this content model
$nativeData = $content->getNativeData();
// Identify the content as unique
$subobjectName = '_MYCUSTOMPREFIX' . md5( $nativeData );
$subject = new DIWikiPage(
$subject->getDBkey(),
$subject->getNamespace(),
$subject->getInterwiki(),
$subobjectName
);
// Build the subobject by using a separate container object
$containerSemanticData = new ContainerSemanticData(
$subject
);
/**
* Start doing all the work required after this
*/
// If one knows the details you can add it directly
$containerSemanticData->addPropertyObjectValue(
new DIProperty( 'PropertyIWantToUse' ),
new DIWikiPage( 'SomeTextItem', NS_MAIN )
);
// If you don't know the type, use the DataValueFactory (see available methods)
$dataValue = DataValueFactory::getInstance()->newDataValueByText(
'AnotherPropertyIWantToUse',
'123'
);
$containerSemanticData->addDataValue(
$dataValue
);
/**
* Done
*/
// This part is used to add the subobject the the main subject
// Page: Foo -> gets a _MYCUSTOMPREFIX.... attached
$parserData->getSemanticData()->addPropertyObjectValue(
new DIProperty( DIProperty::TYPE_SUBOBJECT ),
new DIContainer( $containerSemanticData )
);
$parserData->pushSemanticDataToParserOutput();
return true;
} );
```
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