I have a use case where we want to display member only tabs in our menu but show them as disabled to anonymous users (along with some CSS styling to show a small lock next to the tab).

Ideally I'd like to perform a test in the XSLT file to see if a user has access to a tab and show the normal link, otherwise show the  tab but disable the link and apply a css class.

Something like this:

                    <xsl:choose>
                        <xsl:when test="@useraccess = 1">
                            <a href="{@url}">
                                <xsl:value-of select="@text" />
                            </a>
                        </xsl:when>
                        <xsl:otherwise>
                            <xsl:value-of select="@text" />
                        </xsl:otherwise>
                    </xsl:choose>

Pouring over DDR example...wondering is this is possible.