name of attributes like name() function for elements?

Is it possible to get the name of an attribute in the same way, as
with the name() function for elements?

When merging to files - in my case RelaxNG with some proprietary
extensions residing in a seperate file - I use a key function to
retrieve the content of an element node of the extension file:

But there is also information stored in attributes I need to retrieve
in a similar way. How can this be accomplished? I'm imagining
something like the following:

<xsl:key name="insert.template.attr" match="@*" use="attr-name()"/>
                                           ^^^^      ^^^^
                                       something like this!
and then applying it again this way:

Thanks in advance,
Georges