"Change is inevitable even for persistent information. Effectively managing change of persistent information, which includes the specification, execution and the maintenance of any derived information, is critical and must be addressed by all database systems. Today, for every data model there exists a well-defined set of change primitives that can alter both the structure (the schema) and the data. Several proposals also exist for incrementally propagating a primitive change to any derived information (or view). However, existing support is lacking in two ways. First, change primitives as presented in literature are very limiting in terms of their capabilities allowing users to simply add or remove schema elements. More complex types of changes such the merging or splitting of schema elements are not supported in a principled manner. Second, algorithms for maintaining derived information often do not account for the potential heterogeneity between the source and the target. The goal of this dissertation is to provide solutions that address these two key issues. The first part of this dissertation addresses the challenge of expressing a rich complex set of changes. We propose the SERF (Schema Evolution through an Extensible, Re-usable and Flexible) framework that allows users to perform a wide range of complex user-defined schema transformations. Our approach combines existing schema evolution primitives using OQL (object query language) as the glue logic. Within the context of this work, we look at the different domains in which SERF can be applied, including web site management. To further enrich our framework, we also investigate the optimization and verification of SERF transformations. The second part of this dissertation addresses the problem of maintaining views in the face of source changes when the source and the view are not in the same data model. With today's increasing heterogeneity in information structure, it is critical that maintenance of views addresses the data model boundaries. However, view definitions that go across data models are limited to hard-coded algorithms, thereby making it difficult to develop general maintenance algorithms. We provide a two-step solution for this problem. We have developed a cross algebra, that defines views such that there is no restriction that forces the view and the source data models to be the same. We then define update propagation algorithms that can propagate changes from source to target irrespective of the exact translation and the data models. We validate our ideas by applying them to translation and change propagation between the XML and relational data models."

International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California / Much effort has been spent on developing physical layer standards to ease multi-vendor inter-operability. However as anyone familiar with real-life system integration knows a large gap exists in defining system configuration and set-up, not just between vendors but also between different groups on the base. Different solutions to this problem have been attempted (for example TMATS). However, the emergence of XML (eXtensible Markup Language) as a commercial standard presents a new opportunity to define a powerful and extensible tool for data-interchange between different systems. This paper introduces the self-documenting standard for information exchange that is XML. A generic model for flight test data acquisition is presented. Finally, an XML vocabulary (or schema) based on this model is proposed. This schema could form the basis for an industry wide XML standard to simplify the problem of data interchange between vendors, between programs, even between different databases in the same organisation.

ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada / The next generation of telemetry systems will rely heavily on XML-based standards. Multiple standards are currently being developed and reviewed by the T&E community, including iNET's Metadata Description Language (MDL), the XML-version of IRIG 106, Chapter 9 (TMATS XML), the Instrumentation Hardware Abstraction Language (IHAL), and the Data Display Markup Language (DDML). In this paper, we share design considerations for developing XML-based T&E standards, gained from our experiences in designing IHAL and DDML.

ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada / Describing data formats has gone a long way in providing a common thread for moving test programs from one test range to another without incurring massive code rewrites. The introduction of the IRIG 106-93 standard provided the Telemetry Attributes Transfer Standard (TMATS) to achieve interoperability between the test article and ground processing system. The integrated Network Enhanced Telemetry (iNET) Metadata Description Language (MDL) extends the concept to include descriptions of the equipment configuration and setup. This MDL declarative language is both vendor neutral and vendor customizable (where needed) and extends interoperability down to the individual components of the instrumentation system. This paper describes the current state of MDL and its use across intended vendor lines.

For decades, scholars have denied the crucial roles played by mother figures in Early Modern Peninsular theatre. The erroneous assertion that mothers are dead, absent, or unimportant in the comedia of the Spanish Golden Age is so deep-seated, that it has relegated them to near academic oblivion. This dissertation explores the dynamic interplay between gender and genre through the analysis of the mother figure in the comedias of the Golden Age. It shows the presence of the mother in the comedia of the Golden Age and offers an explanation for the critics’ insistence on her absence. Using a representative sample of canonical and non-canonical works, I show how the negation of the mother’s presence exemplifies the marginalization of feminine themes and characters. The field of cognitive science, specifically attention blindness, the perceptual cycle and schemata provide the theoretical framework for my research, particularly in exploring what this critical blinding reveals about our discipline and its traditionally accepted practices. The character of the mother offers a multitude of possibilities within the comedia, which makes her a potential source for future critical studies.

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Schema therapy was developed by Jeffery Young to treat adults with personality disorders, and has been evidenced to be effective in treating both Axis I and Axis II disorders. While Young stipulates that schemas are likely to be in place by adolescence, there is currently little agreement over the appropriateness of schema theory and therapy in understanding and treating psychopathology in adolescence. This thesis aims to explore the evidence–base and potential utility of applying schema theory to adolescent psychopathology, and consists of a systematic review and research article. The review included published studies measuring Early Maladaptive Schemas (EMS) in 12 to 18 year olds, including those exploring relationships between EMS and psychopathology. The search of relevant literature from 1990 to 2012 yielded 19 articles for review, which were then subject to assessment of methodological quality. Most studies were assessed as ‘moderate’ in quality. Good quality evidence was found for the detection of higher rates of EMS in clinical or referred adolescent populations compared to non–clinical populations, as well as some evidence for effects of age and gender on EMS. Less consistent evidence was found for specific associations between individual EMS or domains and particular types of psychopathology or problem behaviour. Common limitations of the articles reviewed included poor control of confounding variables and little testing of EMS alongside contextual constructs to provide validation of findings. The main research article used a quantitative, questionnaire–based cross– sectional design to test the dimensionality of the schema concept in a population of 12 to 18 year–olds, comparing levels of EMS between a referred and non–referred group. EMS were measured alongside attachment and interpersonal behaviours to test their unique predictive effect on psychopathology. Specific relationships between individual groups of EMS and type of psychopathology were also explored. Results showed that the referred group scored significantly higher than the non–referred group on overall schema score. Schemas were found to significantly predict level of psychopathology, over and above prediction by attachment or interpersonal behaviour scores. There was also evidence for the specific prediction of internalising and externalising problem behaviour, affective, anxiety, oppositional–defiant and conduct problems by clusters of EMS. In conclusion, EMS appear to be a valid concept in predicting and understanding psychopathology in adolescence. A conceptual model is suggested for future research to explore the adaptation of schema theory more fully within developmental psychopathology. It is hoped that future research will test other aspects of schema theory in adolescents such as coping styles and modes. It is proposed that, following further validating evidence, this may result in the development of improved interventions for a range of presenting problems in adolescence.

Data Exchange is the problem of transforming data in one format (the source schema) into data in another format (the target schema). Its core component is a schema mapping, which is a high level specification of how such transformation should be done. Relational data exchange has been extensively studied, but exchanging XML data have been paid much less attention. The goal of this thesis is to develop a theory of XML data exchange with expressive schema mappings, extending a previous work using restricted mappings. Our mapping language is based on tree patterns that can use horizontal navigation and data comparison in addition to downward navigation. First we look at static analysis problems concerning a single mapping. More specif- ically, we consider consistency problems with different flavours. One such problem, for instance, asks if any tree has a solution under the given mapping. Then we turn to analyse the complexity of mapping themselves, i.e., recognising pairs of trees such that the one is mapped to the other. For both problems, we provide classifications based on sets of features used in the mappings. Second we investigate the composition of XML schema mappings. Generally it is hard, or rather simply impossible, to achieve closure under composition in XML settings unlike in relational settings. Nevertheless we identify a class of XML schema mappings that is closed under composition. Lastly we consider the problem of query answering. It is important to exchange data so that we can feasibly answer queries while it often leads to intractability. We identify the dividing line between tractable and intractable cases: answering queries with extended features is always intractable while tractability of answering simple queries can be retained in extended mappings.