@inproceedings{tapp2011b,
    Abstract = {We show that the default-all propagation scheme for database
    annotations is dangerous. Dangerous here means that it can propagate
    annotations to the query output which are semantically irrelevant to the
    query the user asked. This is the result of considering all relationally
    equivalent queries and returning the union of their where-provenance in an
    attempt to define a propagation scheme that is insensitive to query
    rewriting. We propose an alternative query-rewrite-insensitive (QRI)
    where-provenance called minimal propagation. It is analogous to the
    minimal witness basis for why-provenance, straight-forward to evaluate,
    and returns all relevant and only relevant annotations.},
    Author = {Gatterbauer, Wolfgang and Meliou, Alexandra and Suciu, Dan},
    Booktitle = {3rd {USENIX} Workshop on the Theory and Practice of Provenance (TaPP)},
    Title = {\href{http://arxiv.org/pdf/1105.4395}{Default-all is Dangerous!}},
    Venue = {TaPP},
    address = {Heraklion, Greece},
    month = jun,
    Year = {2011}}