Abstract
Time has been successfully used as a feature in web information retrieval tasks. In this context, estimating a document's inception date or last update date is a necessary task. Classic approaches have used HTTP header fields to estimate a document's last update time. The main problem with this approach is that it is applicable to a small part of web documents. In this work, we evaluate an alternative strategy based on a document's neighborhood. Using a random sample containing 10,000 URLs from the Yahoo! Directory, we study each document's links and media assets to determine its age. If we only consider isolated documents, we are able to date 52% of them. Including the document's neighborhood, we are able to estimate the date of more than 86% of the same sample. Also, we find that estimates differ significantly according to the type of neighbors used. The most reliable estimates are based on the document's media assets, while the worst estimates are based on incoming links. These results are experimentally evaluated with a real world application using different datasets. Copyright 2007 ACM.

Abstract
Automatic multimedia retrieval requires the use of complex features, which are typically captured by multidimensional descriptors. A basic operation in a multimedia retrieval system is similarity computation, making use of descriptor-dependant metrics. Many data structures have been proposed for managing the representation of multidimensional descriptors, each geared towards efficiency in some set of basic operations. The paper describes a framework for evaluating multidimensional descriptor indexing structures and reports a set of experiments with selected descriptors indexing methods. The extensibility of the framework is illustrated by incorporating a recently-proposed structure, the BitMatrix. Data sets and experiment conditions can be set up so as to provide results that can be used in the choice of appropriate indexing structures for a class of multimedia retrieval applications.

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Abstract
In this paper, we envision an approach for the automatic generation of a user interface (W) prototype from a system domain model (or core model), that captures the main domain entities and transactions, and a system use case model, which captures. the intended user tasks. This prototype allows the early validation of executable core system models, and can be used as a basis for subsequent developments. The envisioned solution uses OCL to add preciseness and semantic richness both to the domain and use case UML models. The generated UI provides some usability enhancements that are derived from the model's pre-conditions.

Abstract
This paper presents an approach to diminish the effort required in GUI modelling and test coverage analysis within a model-based GUI testing process. A familiar visual notation a subset of UML with minor extensions is used to model the structure, behaviour and usage of GUIs at a high level of abstraction and to describe test adequacy criteria. The GUI visual model is translated automatically to a model-based formal specification language (e.g., Spec{music sharp sign}), hiding formal details from the testers. Then, additional behaviour may be added to the formal model to be used as a test oracle. The adequacy of the test cases generated automatically from the formal model is accessed based on the structural coverage of the UML behavioural diagrams.