QTextCharFormat::setAnchorNames

Hi all,
I'm trying to understand how to insert a href-link into a QDocument or a QTextEdit.
Now, what puzzles me is that two member functions of QTextCharFormat have been declared obsolete:

QString anchorName () const (obsolete)
void setAnchorName ( const QString & name ) (obsolete)

In 4.3 they have been replaced by:

QStringList QTextCharFormat::anchorNames () const
void QTextCharFormat::setAnchorNames ( const QStringList & names )

Why the hell would one want to have a QStringList instead of a single QString for a href?
Can there be more than one in an <a> tag?
What is it that I'm missing here? Thx for any enlightenment!
Chris