// Add the constraint to the Options object
$options3->setReturnSimilar('true');
// Return similar documents
$options3->write('options3');
// Write the search options to the database
// Read the options from the database and display
echo "Word constraint and a search-option:\n\n";
echo htmlspecialchars($options3->read('options3'));
// Field word constraint
$options4 = new MLPHP\Options($client);
// Create an Options object (passing the REST client object)
$field = new MLPHP\FieldWordConstraint('summary', 'summary');
// Set field namespace
$options4->addConstraint($field);
// Add the constraint to the Options object
$options4->setDebug('true');
// Return debugging info
$options4->write('options4');
// Write the search options to the database
// Read the options from the database and display
echo "Field word constraint:\n\n";
echo htmlspecialchars($options4->read('options4'));
echo "\n\n";
// Collection constraint with metadata
$options5 = new MLPHP\Options($client);
// Create an Options object (passing the REST client object)
$collection = new MLPHP\CollectionConstraint('tag', 'http://example.com/tag/');
// Set prefix
$options5->addConstraint($collection);
// Add the constraint to the Options object
$extracts5 = new MLPHP\Extracts();
