attribute-map of attributes with umlaute (ä,ö,ü) does not work in IIS (SP)

[pesche.egli at bluewin.ch]

Hello
I'm  configuring shibboleth-sp-2.6.1.3-win64 on a IIS, accepting 
SAML-Assertions with attribute values containing "Umlaute" (ä,ö,ü)
When the saml2:AttributeValue contains an umlaut (ä,ö,ü), i don't manage 
it to get it out from the request-header within the .NET webapp
As far as i understood, no special AttributeDecoder is required in the 
attribute-map.xml file.
When I played around with the XMLAttributeDecoder, i got the whole 
xml-element of the value out in the request-header (base64 encoded) , 
but that is not the way to go.
Any ideas and/or pointers?
thanks in advance
regards
/Peter
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