Answerability Without Answers

Leadership Without Easy Answers

Health consequences of rural illicit drug use: questions without answers.

Previous chapters in this monograph have noted a general lack of epidemiological data concerning illicit drug use in rural America, a lack that extends to the health consequences of substance misuse behaviors among rural dwellers. Urban population studies indicate that the major health risks associated with illicit drug use are hepatitis (users are 12 times as likely as nonusers to contract hep...

Efficient Cache Answerability for XPath Queries

The problem of cache answerability has traditionally been studied over conjunctive queries performed on top of a relational database system. However, with the proliferation of semistructured data and, in particular, of XML as the de facto standard for information interchange on the Internet, most of the assumptions and methods used for traditional systems – and cache answerability is no excepti...

Doctors Without Answers: Limits, Challenges, and Dilemmas of Humanitarian (Bio)medicine, and Doctors Without Borders

A Logic-Based Approach to Cache Answerability for XPath Queries

We extend a recently proposed model checking-based algorithm for the evaluation of XPath queries with a cache strategy to store the results of the (most frequently) asked queries and to re-use them at occurrence. We experimentally show that, as soon as the cache is warm, the proposed optimization is quite effective. We complement our proposal with a broad experimental comparison of different st...