unrecognized input signature using MSXML2 on an otherwise fine XML document

Hi there,

I am using ActiveState Perl and Win32::OLE->new('Msxml2.DOMDocument.6.0') along with an xml file. I want to read the contents into an object, which normally works fine, but for some xml files I get 'unrecognized input signature'. Yet these files work fine with say Altova XmlSpy.

Some browsing on the web leads me to assume that the message hints that not all characters in the file are utf-8. And I assume that MSXML2 is more sensative to this than for instance XmlSpy.

Can anyone confirm my assumptions? And of course: can anyone suggest how to handle these xml files, so that I can read them properly into MSXML2? Or maybe: how can I detect the characters that cause the issue?
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AmkickAsked:
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Geert BormansConnect With a Mentor Information ArchitectCommented:
You can safely assume that you can not trust XML Spy, that I can confirm.

There are some things you should check however:
- is there any white-space preceding the root element or the xml-declaration? This is not allowed, but xml-spy ignores this
- is the encoding really UTF-8, or is another encoding listed in the xml-declaration. You might be using an encoding that is supported by Spy but not by msxml (though I am not aware there is such an encoding)

It could be wise to download a trial oxygen IDE (www.oxygenxml.com) and check the files against a different parser
That would be the way to figure out what is going one exactly

good luck
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AmkickAuthor Commented:
It turned out to be some coding that went bad and produced whitespace before the <?xml declaration. Simple, but so hard to find if you don't know where to look. Thanks for the advice. It is great to know what 'unrecognized input signature' actually means.
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Geert BormansInformation ArchitectCommented:
welcome
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