private void setupOOXMLMetadata(Metadata metadata) {
        // simple property
        metadata.set(TikaCoreProperties.LANGUAGE, "language");
        // language alternative
        metadata.set(TikaCoreProperties.TITLE, "title");
        // comma separated array
        metadata.set(TikaCoreProperties.SUBJECT, "keyword1,keyword2");
        // OOXML specific simple prop
        metadata.set(TikaCoreProperties.MODIFIER, "lastModifiedBy");
    }
Tests the Tika <code>Metadata</code> to XMP conversion functionatlity
tika-xmp/src/test/java/org/apache/tika/xmp/TikaToXMPTest.java