HasAttributes liefert False, obwohl Attribut vorhanden

[Luckie]

Folgende XML:

XML-Code:

<?xml version="1.0" encoding="UTF-8"?>
<businessRelationship id="1">
    <businessSupplier id="1">

Und kein Code:

Code:

public void Load(string BRFile)
        {
            _xmlFile = BRFile;                        
            try
            {
                _pathDocument = new XPathDocument(_xmlFile);
                XPathNavigator _nav = _pathDocument.CreateNavigator();
                if (_nav.SelectSingleNode("businessRelationship") != null)
                {                    
                    if (_nav.HasAttributes)
                    {
                        
                    }
                }
                _bsi = new BusinessSupplierItem(_pathDocument);
                _bsi.GetDetails();
            }
            catch (Exception e)
            {
                throw (e);
            }
        }

Warum liefert if (_nav.HasAttributes) false, obwohl ein Attribut vorhanden ist?