pyexiv2-developers team mailing list archive

[Benjamin Henne <henne@xxxxxxxxxxxxxxxxxxxxx>]

Hi.

> As you already found out, a current limitation of pyexiv2 is that it
> doesn’t allow setting the type of an unknown tag in a custom namespace
> to anything other than XmpText (this is documented in the tutorial, see
> http://tilloy.net/dev/pyexiv2/tutorial.html#reading-and-writing-xmp-tags).

But the tags I want to add are not in a custom namespace. I added the 
namespaces in libexiv2 before. Currently not in trunk, but as patch 
appended to the discussion at http://dev.exiv2.org/boards/3/topics/1039.

Could this maybe be a shortcoming of pyexiv2? I guess this is a  special 
case which currently is not often used: There is a tag containing 
nothing but structures of other tags. Example:

Xmp.MP.RegionInfo                            XmpText     0  type="Struct"
Xmp.MP.RegionInfo/MPRI:Regions               XmpText     0  type="Bag" 
<- problem is here
Xmp.MP.RegionInfo/MPRI:Regions[1]            XmpText     0  type="Struct"
Xmp.MP.RegionInfo/MPRI:Regions[1]/MPReg:Rectangle XmpText    38 
0.661608, 0.244310, 0.130501, 0.261002
Xmp.MP.RegionInfo/MPRI:Regions[1]/MPReg:PersonDisplayName XmpText     8 
 Baby Tux

The only other tags I found that may correspond to this structure are 
Xmp.XmpMM.History* although there is still less tag hierachy.

Xmp.xmpMM.History                            XmpText     0  type="Seq"
Xmp.xmpMM.History[1]                         XmpText     0  type="Struct"
Xmp.xmpMM.History[1]/stEvt:action            XmpText     7  created
Xmp.xmpMM.History[1]/stEvt:instanceID        XmpText    40 
xmp.iid:4D9C1E280B37E111A568FF94F417581A
Xmp.xmpMM.History[1]/stEvt:when              XmpText    25 
2012-01-04T20:32:52+01:00
Xmp.xmpMM.History[1]/stEvt:softwareAgent     XmpText    27  Adobe 
Photoshop CS5 Windows

Could the latter be written to file using pyexiv2?

My problem seems to be there is no ArrayType (Bag, ...) in pyexiv2? Only 
arrayValues and tag type. Would it be complex to add this to pyexiv2 if 
it is no libexiv2 issue? I have never worked with anything like boost 
and Cpp. See http://dev.exiv2.org/boards/3/topics/1039#message-1044 
Exiv2::XmpValue::setXmpArrayType()

If it helps, I can provide you my patched libexiv2 source.


Regards,
Benjamin

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