[jira] [Created] (PDFBOX-2855) Allow some flexibility for divergences from the standard on Seq vs Bag in DomXMPParser

["Tim Allison (JIRA)" <ji...@apache.org>]

Tim Allison created PDFBOX-2855:
-----------------------------------

             Summary: Allow some flexibility for divergences from the standard on Seq vs Bag in DomXMPParser
                 Key: PDFBOX-2855
                 URL: https://issues.apache.org/jira/browse/PDFBOX-2855
             Project: PDFBox
          Issue Type: Improvement
            Reporter: Tim Allison


While working on TIKA-1285 (migrate to PDFBox 2.0.0), [~rpialum] noticed that the DomXmpParser was failing on some XMP with:

{noformat}
org.apache.xmpbox.xml.XmpParsingException: Invalid array type, expecting Seq and found Bag [prefix=dc; name=creator]
	at org.apache.xmpbox.xml.DomXmpParser.manageArray(DomXmpParser.java:449)
	at org.apache.xmpbox.xml.DomXmpParser.createProperty(DomXmpParser.java:338)
	at org.apache.xmpbox.xml.DomXmpParser.parseChildrenAsProperties(DomXmpParser.java:305)
	at org.apache.xmpbox.xml.DomXmpParser.parseDescriptionRoot(DomXmpParser.java:234)
	at org.apache.xmpbox.xml.DomXmpParser.parse(DomXmpParser.java:198)
	at org.apache.tika.parser.pdf.PDFParser.extractMetadata(PDFParser.java:202)
{noformat}

One file that triggers this is available on Tika-1252 [here| https://issues.apache.org/jira/secure/attachment/12632592/Sample%20%28Acrobat%204.x%29.pdf ]

The raw xmp for that file includes: 
{noformat}
         <dc:creator>
            <rdf:Bag>
               <rdf:li>Single Author</rdf:li>
            </rdf:Bag>
         </dc:creator>
{noformat}

On TIKA-1252, I confirmed that this is against the spec [link|https://issues.apache.org/jira/browse/TIKA-1252?focusedCommentId=13919846&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13919846] and [~alexandre.madurell@gmail.com] confirmed that this was what Acrobat was generating [link|https://issues.apache.org/jira/browse/TIKA-1252?focusedCommentId=13919858&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13919858].

So, would it be easy enough to allow for some divergence from the standard?

Code to reproduce issue in tika setup:
{noformat}
    @Test
    public void oneOffMetadataTest() throws Exception {
        PDDocument doc = PDDocument.load(this.getClass().getResourceAsStream("/test-documents/sampleAcrobat_4_x.pdf"));
        DomXmpParser p = new DomXmpParser();
        p.setStrictParsing(false);
        p.parse(doc.getDocumentCatalog().getMetadata().exportXMPMetadata());
    }
{noformat}



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