| A new privacy model for XML data called Privacy for All (P4A) to capture collectors privacy practice and data providers privacy preferences is developed in this thesis. Through P4A data collectors specify the purpose of data collection along with recipients, retention time, and permissable users of private data. Data providers can agree to the collectors' practice or impose their own privacy preferences. P4A offers more flexibility to both data collectors and providers in specifying privacy statements and preferences, including, but not limited to full permission, denial, and conditional access to information.;A privacy practice defines purposes, recipients, retention period, and uses of data collection. Data providers share their private information with data collectors under restrictions specified by privacy preferences. P4A offers individuals multiple options for restrictions such as conditional access or returning results as range intervals for each data item and purpose. Privacy preferences can be more restrictive than privacy practices suggested by collectors. Only preferences more restrictive than the collector's practice are stored in a compressed privacy map, thereby minimizing the overhead in privacy concerned XML databases. |
