Hello,
We use PDFBox to read the XMP metadata of PDF documents in the Factur-X
standard, a Franco-German e-invoicing standard.
The XML schema corresponding to this metadata is quite simple, and retrieving
the values are perfectly working with the
org.apache.xmpbox.XMPMetadata.getSchema(String) method.
By default, the prefix is fx :
<rdf:Description
xmlns:fx="urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#" rdf:about="">
<fx:DocumentType>INVOICE</fx:DocumentType>
<fx:DocumentFileName>factur-x.xml</fx:DocumentFileName>
<fx:Version>1.0</fx:Version>
<fx:ConformanceLevel>BASIC</fx:ConformanceLevel>
</rdf:Description>
In one case, there were a document with two schemas with the same namespace
URI, but different prefixes (fx and zf)
I tried the org.apache.xmpbox.XMPMetadata.getSchema(String, String) method,
which according to the documentation seems to handle this case by filtering by
prefix.
I got a NullPointerException from this method (line 268), because the prefix of
the Factur-x schema in the org.apache.xmpbox.XMPMetadata.schemas collection was
null.
So, I've run tests with a hundred example files provided by the Factur-X
consortium, and it seems that for any file, the schema with the Factur-X URI
always gets a null prefix, regardless of whether one or more schemas exist with
this namespace.
This raise two points :
1. If the prefix can be null, the getSchema(String, String) method should
handle it.
2. Is the Factur-X metadata specification a correct XMP standard, or is
there a bug in the prefix parsing ?
Here's the PDF document : [Icône pdf]
pdfExemple.pdf<https://cegidgroup-my.sharepoint.com/:b:/g/personal/sbabin_cegid_com/EVN8vpGbR1pEvaOuoIjyvfQBuhV1ZWFlYfAIKMfuAhd6Aw?e=cahEv2>
Here's the code I use to retrieve the Factur-X metadata values :
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
import org.apache.pdfbox.pdmodel.common.PDMetadata;
import org.apache.xmpbox.XMPMetadata;
import org.apache.xmpbox.schema.XMPSchema;
import org.apache.xmpbox.xml.DomXmpParser;
import org.apache.xmpbox.xml.XmpParsingException;
public class FacturX {
public static void main(String[] args) throws XmpParsingException,
IOException {
try {
File finputFile = new File(args[0]);
PDDocument doc = PDDocument.load(finputFile);
PDDocumentCatalog catalog = doc.getDocumentCatalog();
PDMetadata m = catalog.getMetadata();
InputStream xmlInputStream = m.createInputStream();
DomXmpParser p = new DomXmpParser();
p.setStrictParsing(false);
XMPMetadata metadata = p.parse(xmlInputStream);
// Getting the factur-x schema with the default "fx" prefix
(case of two factur-x schemas with different prefixes)
XMPSchema fx = metadata.getSchema("fx",
"urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#");
// If there is no schema with fx prefix, searching for the
schema only with the namespace URI
if (fx == null) {
fx =
metadata.getSchema("urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#");
}
if (fx == null) {
System.out.println("This PDF document is not a valid
Factur-X file");
} else {
String conformanceLevel =
fx.getUnqualifiedTextPropertyValue("ConformanceLevel");
String documentType =
fx.getUnqualifiedTextPropertyValue("DocumentType");
String version =
fx.getUnqualifiedTextPropertyValue("Version");
String documentFileName =
fx.getUnqualifiedTextPropertyValue("DocumentFileName");
}
} catch (XmpParsingException | IOException e) {
e.printStackTrace();
}
}
}
Thanks for your help,
Sylvère Babin
Developer
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