Extension schema in pdf/A

[Ste88]

Hi to everyone,

I'm trying to fix a document that claims to be pdf/A-1 compliant but does not respect the XMP rules set by ISO 19005-1.
Using ExfiTool I've extracted XMP metadata from the file:

Code Select Expand

<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 4.2.1-c043 52.372728, 2009/01/18-15:08:04">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about="" xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:format>application/pdf</dc:format>
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="x-default">FA2004-0521</rdf:li>
</rdf:Alt>
</dc:title>
<dc:creator>
<rdf:Seq>
<rdf:li>Laury ROBIN</rdf:li>
</rdf:Seq>
</dc:creator>
<dc:description>
<rdf:Alt>
<rdf:li xml:lang="x-default">Facture</rdf:li>
</rdf:Alt>
</dc:description>
<dc:subject>
<rdf:Bag>
<rdf:li>FA2004-0521 Facture NTT DATA Italia S.p.A.</rdf:li>
</rdf:Bag>
</dc:subject>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/">
<xmp:CreateDate>2020-04-24T13:52:04+00:00</xmp:CreateDate>
<xmp:CreatorTool>Dolibarr 7.0.6</xmp:CreatorTool>
<xmp:ModifyDate>2020-04-24T13:52:04+00:00</xmp:ModifyDate>
<xmp:MetadataDate>2020-04-24T13:52:04+00:00</xmp:MetadataDate>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:pdf="http://ns.adobe.com/pdf/1.3/">
<pdf:Keywords>FA2004-0521 Facture NTT DATA Italia S.p.A.</pdf:Keywords>
<pdf:Producer>TCPDF 6.2.12 (http://www.tcpdf.org)</pdf:Producer>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/">
<xmpMM:DocumentID>uuid:751abdfa-3424-2f3e-8617-2d3cffd6cfc8</xmpMM:DocumentID>
<xmpMM:InstanceID>uuid:751abdfa-3424-2f3e-8617-2d3cffd6cfc8</xmpMM:InstanceID>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:pdfaExtension="http://www.aiim.org/pdfa/ns/extension/" xmlns:pdfaSchema="http://www.aiim.org/pdfa/ns/schema#" xmlns:pdfaProperty="http://www.aiim.org/pdfa/ns/property#">
<pdfaExtension:schemas>
<rdf:Bag>
<rdf:li rdf:parseType="Resource">
<pdfaSchema:namespaceURI>http://ns.adobe.com/pdf/1.3/</pdfaSchema:namespaceURI>
<pdfaSchema:prefix>pdf</pdfaSchema:prefix>
<pdfaSchema:schema>Adobe PDF Schema</pdfaSchema:schema>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<pdfaSchema:namespaceURI>http://ns.adobe.com/xap/1.0/mm/</pdfaSchema:namespaceURI>
<pdfaSchema:prefix>xmpMM</pdfaSchema:prefix>
<pdfaSchema:schema>XMP Media Management Schema</pdfaSchema:schema>
<pdfaSchema:property>
<rdf:Seq>
<rdf:li rdf:parseType="Resource">
<pdfaProperty:category>internal</pdfaProperty:category>
<pdfaProperty:description>UUID based identifier for specific incarnation of a document</pdfaProperty:description>
<pdfaProperty:name>InstanceID</pdfaProperty:name>
<pdfaProperty:valueType>URI</pdfaProperty:valueType>
</rdf:li>
</rdf:Seq>
</pdfaSchema:property>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<pdfaSchema:namespaceURI>http://www.aiim.org/pdfa/ns/id/</pdfaSchema:namespaceURI>
<pdfaSchema:prefix>pdfaid</pdfaSchema:prefix>
<pdfaSchema:schema>PDF/A ID Schema</pdfaSchema:schema>
<pdfaSchema:property>
<rdf:Seq>
<rdf:li rdf:parseType="Resource">
<pdfaProperty:category>internal</pdfaProperty:category>
<pdfaProperty:description>Part of PDF/A standard</pdfaProperty:description>
<pdfaProperty:name>part</pdfaProperty:name>
<pdfaProperty:valueType>Integer</pdfaProperty:valueType>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<pdfaProperty:category>internal</pdfaProperty:category>
<pdfaProperty:description>Amendment of PDF/A standard</pdfaProperty:description>
<pdfaProperty:name>amd</pdfaProperty:name>
<pdfaProperty:valueType>Text</pdfaProperty:valueType>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<pdfaProperty:category>internal</pdfaProperty:category>
<pdfaProperty:description>Conformance level of PDF/A standard</pdfaProperty:description>
<pdfaProperty:name>conformance</pdfaProperty:name>
<pdfaProperty:valueType>Text</pdfaProperty:valueType>
</rdf:li>
</rdf:Seq>
</pdfaSchema:property>
</rdf:li>
</rdf:Bag>
</pdfaExtension:schemas>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end="w"?>


than I parsed it with a XMP validator that returns this error:

XMP metadata: Required property 'pdfaSchema:property' missing in PDF/A Schema Value Type
Validated against PDF/A-1

So, because the problem is due to the presence of XMP extension schema, I have to options:

- remove it
- And the missing property

But I don't know where to find this pdfaSchema, so I would follow the first option.
Can you suggest me any advice to perform this operation?
Thank you
Regards
Stefano