public function writeVBARelationships(PHPExcel $pPHPExcel = null){
		// Create XML writer
		$objWriter = null;
		if ($this->getParentWriter()->getUseDiskCaching()) {
			$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
		} else {
			$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
		}

		// XML header
		$objWriter->startDocument('1.0','UTF-8','yes');

		// Relationships
		$objWriter->startElement('Relationships');
		$objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/package/2006/relationships');
		$objWriter->startElement('Relationship');
		$objWriter->writeAttribute('Id', 'rId1');
		$objWriter->writeAttribute('Type', 'http://schemas.microsoft.com/office/2006/relationships/vbaProjectSignature');
		$objWriter->writeAttribute('Target', 'vbaProjectSignature.bin');
		$objWriter->endElement();//Relationship
		$objWriter->endElement();//Relationships

		// Return
		return $objWriter->getData();

	}