@Test
    public void testPDFVT() throws Exception {
        Metadata metadata = extract("testPDFVT.xmp");
        assertEquals("PDF/VT-1", metadata.get(PDF.PDFVT_VERSION));
        assertEquals("2018-08-06T11:53:12Z",
                metadata.getDate(PDF.PDFVT_MODIFIED).toInstant().toString());
    }
This tests our custom schemas and PDF/A
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/test/java/org/apache/tika/parser/pdf/CustomTikaXMPTest.java