How to debug "Error: XMP Toolkit error 201: Error in XMLValidator"

[bellomo]

Dear all,

i'm having the problem that exiv2 -pa refuses to read the XMP tags with error

Error: XMP Toolkit error 201: Error in XMLValidator
Warning: Failed to decode XMP metadata.

on an image.

I interpret this as a case of one or more XMP tags not defined properly however i cannot find a way to understand which tag(s) is causing the problem in order to fix it.

Is there any way to get more info ? I did not find any after spending some time on the doc.

Thanks in advance,
Max

[clanmills]

I think this is caused by the invalid XMP, which is written in XML. You can extract the raw XMP using the option -pX and validate it with xmllint.

505 rmills@macbookpro:~ $ exiv2 -pX https://clanmills.com/Stonehenge.jpg | xmllint -pretty 2 -
<?xml version="1.0"?>
<?xpacket
begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta
    xmlns:x="adobe:ns:meta/"
    x:xmptk="XMP Core 4.4.0-Exiv2"
  > <rdf:RDF
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    > <rdf:Description
        xmlns:xmp="http://ns.adobe.com/xap/1.0/"
        xmlns:cm2e="http://clanmills.com/exiv2/"
        xmlns:dc="http://purl.org/dc/elements/1.1/"
        rdf:about=""
        xmp:Rating="0"
        xmp:ModifyDate="2015-07-16T20:25:28+01:00"
        cm2e:Father="Robin Mills"
      > <cm2e:Family
        > <rdf:Bag
        /> </cm2e:Family
      > <dc:description
        > <rdf:Alt
          > <rdf:li
              xml:lang="x-default"
            >Classic View</rdf:li
          > </rdf:Alt
        > </dc:description
      > <dc:Family
        > <rdf:Bag
          > <rdf:li
            >Robin</rdf:li
          > </rdf:Bag
        > </dc:Family
      > </rdf:Description
    > </rdf:RDF
  > </x:xmpmeta
>
<?xpacket
end="w"?>
506 rmills@macbookpro:~ $ 

xmllint will give an error for invalid XML. You can determine the location of the XMP in the image with exiv2 -pS

STRUCTURE OF JPEG FILE: https://clanmills.com/Stonehenge.jpg
 address | marker       |  length | data
       0 | 0xffd8 SOI  
       2 | 0xffe1 APP1  |   15272 | Exif..II*......................
   15276 | 0xffe1 APP1  |    2786 | http://ns.adobe.com/xap/1.0/.<?x
   18064 | 0xffed APP13 |      96 | Photoshop 3.0.8BIM.......'.....
   18162 | 0xffe2 APP2  |    4094 | MPF.II*...............0100.....
   22258 | 0xffdb DQT   |     132 
   22392 | 0xffc0 SOF0  |      17 
   22411 | 0xffc4 DHT   |     418 
   22831 | 0xffda SOS  
508 rmills@macbookpro:~ $ 

With this information, you can use dd to extract the XML into a file for repair and replacement in the image.