Wow, that's a bloated format. Here it is as XML:

<?xpacket begin="?" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.4-c002 1.000000, 0000/00/00-00:00:00 ">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:xmp="http://ns.adobe.com/xap/1.0/">
<xmp:CreatorTool>Picasa</xmp:CreatorTool>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:mwg-rs="http://www.metadataworkinggroup.com/schemas/regions/"
xmlns:stDim="http://ns.adobe.com/xap/1.0/sType/Dimensions#"
xmlns:stArea="http://ns.adobe.com/xmp/sType/Area#">
<mwg-rs:Regions rdf:parseType="Resource">
<mwg-rs:AppliedToDimensions rdf:parseType="Resource">
<stDim:w>912</stDim:w>
<stDim:h>687</stDim:h>
<stDim:unit>pixel</stDim:unit>
</mwg-rs:AppliedToDimensions>
<mwg-rs:RegionList>
<rdf:Bag>
<rdf:li rdf:parseType="Resource">
<mwg-rs:Type></mwg-rs:Type>
<mwg-rs:Area rdf:parseType="Resource">
<stArea:x>0.680921052631579</stArea:x>
<stArea:y>0.3537117903930131</stArea:y>
<stArea:h>0.4264919941775837</stArea:h>
<stArea:w>0.32127192982456143</stArea:w>
<stArea:unit>normalized</stArea:unit>
</mwg-rs:Area>
</rdf:li>
</rdf:Bag>
</mwg-rs:RegionList>
</mwg-rs:Regions>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:exif="http://ns.adobe.com/exif/1.0/">
<exif:PixelXDimension>912</exif:PixelXDimension>
<exif:PixelYDimension>687</exif:PixelYDimension>
<exif:ExifVersion>0220</exif:ExifVersion>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>

<!-- whitespace padding -->

<?xpacket end="w"?>

And here it is as SXML (https://en.wikipedia.org/wiki/SXML):

(*TOP* (*PI* |xpacket| "begin=\"?\" id=\"W5M0MpCehiHzreSzNTczkc9d\"")
(|adobe:ns:meta/:xmpmeta|
(@ (@ (*NAMESPACES* (|adobe:ns:meta/| "adobe:ns:meta/" . |x|)))
(|adobe:ns:meta/:xmptk|
"Adobe XMP Core 5.4-c002 1.000000, 0000/00/00-00:00:00 "))
"
"
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:RDF|
(@
(@
(*NAMESPACES*
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#|
"http://www.w3.org/1999/02/22-rdf-syntax-ns#" . |rdf|))))
"
"
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:Description|
(@
(@
(*NAMESPACES*
(|http://ns.adobe.com/xap/1.0/| "http://ns.adobe.com/xap/1.0/"
. |xmp|)))
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:about| ""))
"
"
(|http://ns.adobe.com/xap/1.0/:CreatorTool| "Picasa") "
")
"
"
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:Description|
(@
(@
(*NAMESPACES*
(|http://ns.adobe.com/xmp/sType/Area#|
"http://ns.adobe.com/xmp/sType/Area#" . |stArea|)
(|http://ns.adobe.com/xap/1.0/sType/Dimensions#|
"http://ns.adobe.com/xap/1.0/sType/Dimensions#" . |stDim|)
(|http://www.metadataworkinggroup.com/schemas/regions/|
"http://www.metadataworkinggroup.com/schemas/regions/" . |mwg-rs|)))
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:about| ""))
"
"
(|http://www.metadataworkinggroup.com/schemas/regions/:Regions|
(@ (|http://www.w3.org/1999/02/22-rdf-syntax-ns#:parseType| "Resource")) "
"
(|http://www.metadataworkinggroup.com/schemas/regions/:AppliedToDimensions|
(@ (|http://www.w3.org/1999/02/22-rdf-syntax-ns#:parseType| "Resource")) "
"
(|http://ns.adobe.com/xap/1.0/sType/Dimensions#:w| "912") "
"
(|http://ns.adobe.com/xap/1.0/sType/Dimensions#:h| "687") "
"
(|http://ns.adobe.com/xap/1.0/sType/Dimensions#:unit| "pixel") "
")
"
"
(|http://www.metadataworkinggroup.com/schemas/regions/:RegionList| "
"
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:Bag| "
"
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:li|
(@
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:parseType| "Resource"))
"
"
(|http://www.metadataworkinggroup.com/schemas/regions/:Type|) "
"
(|http://www.metadataworkinggroup.com/schemas/regions/:Area|
(@
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:parseType| "Resource"))
"
"
(|http://ns.adobe.com/xmp/sType/Area#:x| "0.680921052631579") "
"
(|http://ns.adobe.com/xmp/sType/Area#:y| "0.3537117903930131") "
"
(|http://ns.adobe.com/xmp/sType/Area#:h| "0.4264919941775837") "
"
(|http://ns.adobe.com/xmp/sType/Area#:w| "0.32127192982456143") "
"
(|http://ns.adobe.com/xmp/sType/Area#:unit| "normalized") "
")
"
")
"
")
"
")
"
")
"
")
"
"
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:Description|
(@
(@
(*NAMESPACES*
(|http://ns.adobe.com/exif/1.0/| "http://ns.adobe.com/exif/1.0/"
. |exif|)))
(|http://www.w3.org/1999/02/22-rdf-syntax-ns#:about| ""))
"
"
(|http://ns.adobe.com/exif/1.0/:PixelXDimension| "912") "
"
(|http://ns.adobe.com/exif/1.0/:PixelYDimension| "687") "
"
(|http://ns.adobe.com/exif/1.0/:ExifVersion| "0220") "
")
"
")
"
")
(*COMMENT* " whitespace padding ") (*PI* |xpacket| "end=\"w\""))

The only terrible thing about the SXML is the preserved-whitespace from the XML (which of course wouldn't exist in pure SXML); otherwise it's much nicer and contains exactly as much information.