AdobePDFSchema.getProducer() returns empty string

I experienced this bug while PDF/A validation process. The document is not considered valid because the producer value is not in sync with PDDocumentInformation.

PDDocumentInformation.getProducer() = ` ' (one space)
AdobePDFSchema.getProducer() = `' (empty)

Below the metadata extracted from the PDF document:

<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about="" xmlns:xap="http://ns.adobe.com/xap/1.0/">
<xap:CreatorTool>Canon </xap:CreatorTool>
<xap:CreateDate>2014-01-23T20:09:45+01:00</xap:CreateDate>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:pdf="http://ns.adobe.com/pdf/1.3/">
<pdf:Producer> </pdf:Producer>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/">
<pdfaid:part>1</pdfaid:part>
<pdfaid:conformance>B</pdfaid:conformance>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end="w"?>

As you can see the Producer value should be equal to ` ' (one space).

The bug is located within the method DomXmpParser.removeComments. This method is invoked during the unmarshalling process and removes much more than comments, text nodes too!

I can fix (badly) MY issue by changing the code base from :

Text t = (Text) node;
if (t.getTextContent().trim().length() == 0)

Unknown macro: { // XXX is there a better way to remove useless Text ? node.getParentNode().removeChild(node); }

into :

Text t = (Text) node;
if (t.getTextContent().startsWith("\n"))

Unknown macro: { // XXX is there a better way to remove useless Text ? node.getParentNode().removeChild(node); }

But this is not a long term fix.

IMHO, the unmarshalling process should be reworked.