@InProceedings {dms-sws2005,
    author = {S. {De Capitani di Vimercati} and S. Marrara and P. Samarati},
    booktitle = {Proc. of the ACM Workshop on Secure Web Services (SWS 2005)},
    title = {An Access Control Model for Querying {XML} Data},
    address = {Fairfax, VA, USA},
    month = {November},
    day = {11},
    year = {2005}
}