Macros + Require constructs

[John Allen <john@xxxxxxx>]

I am trying to setup up a webdav serve.  Each user is allocated a 
directory (%location) and an id (%user). In order to try and make this 
some what easier to administer I wrote the following macro

<Macro WebDavUser %location %user>
# %location

    Alias /%location /srv/webdav/data/%location

    <Directory /srv/webdav/data/%location>
        DAV On
        Options +Indexes +MultiViews +FollowSymLinks
        IndexOptions -IconsAreLinks +NameWidth=* +FancyIndexing 
+FoldersFirst +HTMLTable
        IndexOrderDefault Ascending Name
        DirectoryIndex disabled
        AllowOverride None
        DavDepthInfinity on
        DavMinTimeout 600

        AuthType Digest
        AuthName "webdav"
        AuthDigestProvider socache file
        AuthUserFile /srv/webdav/auth.d/digest_pw
        AuthnCacheProvideFor file
        AuthnCacheTimeout 600
        AuthnCacheContext webdav

        Require user %user

    </Directory>

</Macro>

Users are added to a simple file which is included in the webdav config 
file.

        Use WebDavUser ProjectA  john
        Use WebDavUser ProjectB  kathleen
        Use WebDavUser ProjectC jack

This works quite nicely. However I am trying to work out how I can make 
this work when there is no specific user. For example if I were to 
provide a common area ("Common")

        Use WebDavUser Common ?

Would the following be secure enough, is there another "better" way of 
doing this?

        <RequireAny>
                 Require valid-user
                 Require user %user
         </RequireAny>




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