def format_url(number, xelatex=True):
    """
    This function formats the URL field. If xelatex is used
    then we can allow for break-markers "\\-"
    """
    breakchar = '\\-' if xelatex else ''
    url = ('http://www.3gpp.org/{breakchar}DynaReport/{breakchar}{number}.htm'
        .format(breakchar=breakchar, number=number.replace('.', '')))
    return url
