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You might want to develop a form with InfoPath 2007 (because it's more comfortable) and then use it in InfoPath 2003. Therefore you can save the form in the 2003-format in InfoPath 2007. However, when you try to open your form in 2003 you'll get the error message:

Error - InfoPath cannot open the selected form because of an error in the form's code. A floating attribute may not be passed as the context node for an XSLT transform or an XPath query.

The german error message is:

Das ausgewählte Formular kann aufgrund eines Fehlers im Code nicht geöffnet werden.
Ein unverankertes Attribut kann nicht als Kontextknoten für eine XSLT-Transformation oder eine XPath-Abfrage weitergegeben werden.

The form you just developed can only be opened under the following conditions:

So you have the following possibilties to develop a InfoPath 2003 with

• With InfoPath 2003, VSTA in JScript/VBScript
• With InfoPath 2003, Visual Studio 2003, Infopath 2003 SDK (which comes with a template for VS 2003) in C#/Visual Basic