Página 12 dos resultados de 2156 itens digitais encontrados em 0.005 segundos

## Effectively delivering XML information in periodic broadcast environments

Qin, Y.; Sheng, Q.; Mehdi, M.; Wang, H.; Xie, D.
Fonte: Springer; Germany Publicador: Springer; Germany
Tipo: Conference paper
Relevância na Pesquisa
27.2%
Existing data placement algorithms for wireless data broadcast generally make assumptions that the clients’ queries are already known and the distribution of access frequencies of their queries can be obtained a priori. Unfortunately, these assumptions are not realistic in most real life applications because new mobile clients may join in anytime and clients may be reluctant to disclose their queries (due to privacy concerns). In this paper, we study the data placement problem of periodic XML data broadcast in mobile wireless environments. This is an important issue, particularly when XML becomes prevalent in today’s ubiquitous Web and mobile computing devices. Taking advantage of the structured characteristics of XML data, we are able to generate effective broadcast programs based purely on XML data on the server without any knowledge of the clients’ access patterns. This not only makes our work distinguished from previous studies, but also enables it to have broader applicability. We discuss structural sharing in XML data which forms the basis of our novel data placement algorithm. The proposed placement algorithm is validated through a set of experiments and the results show that our algorithm can effectively place XML data on air and significantly improve the overall access efficiency.; Yongrui Qin...

## Using XML/HTTP to store, serve and annotate tactical scenarios for X3D operational visualization and anti-terrorist training

Mnif, Khaled
Relevância na Pesquisa
27.2%
Approved for public release, distribution unlimited; Adopting Extensible Markup Language (XML) and Hypertext Transfer Protocol (HTTP) are key steps to accommodate the evolution of Internet technologies. While HTTP is already a proven standard communication protocol responsible for the rapid expansion of the World Wide Web, XML provides general mechanisms for determining validatable documents and addresses several deficiencies of HTML regarding diverse document structure and content. XML and HTTP together provide many of the essential capabilities associated with database engines. The Modeling, Virtual Environments and Simulation (MOVES) Institute of the Naval Postgraduate School (NPS) is continuing to build a database of 3D tactical scenarios and using X3D and VRML tools. The configuration parameters and statistical results of these scenarios are XML documents. For a better understanding and usability of these results by the end users, a Webbased application stores and manipulates these XML document. This thesis develops a server-side application that can store, serve, and annotate tactical scenarios for X3D operational visualization and anti-terrorist training by using XML and HTTP technologies. The experimental demonstration for this work is the prototypical Anti-Terrorism/Force Protection (AT/FP) simulation model developed by Lieutenant James W. Harney...

## Extensible Markup Language (XML) based analysis and comparison of heterogeneous databases

Halle, Robert F.
Relevância na Pesquisa
27.2%
This thesis describes an Extensible Markup Language (XML) based analysis and comparison method that could be used to identity equivalent components of heterogeneous databases. In the Department of Defense there currently exist multiple databases required to support command and control of some portion of the battlefield force. Interoperability between forces will become crucial as the force structure continues to be reduced. This interoperability will be facilitated through the integration of these command and control databases into a singular joint database or by developing inter- communication schema to support inter-database communications. The first step in either of these alternatives is the identification of equivalent components among the multiple databases. This thesis describes how XML can be used to facilitate the process of analyzing and comparing multiple databases. Each step of the process is described in detail accompanied by explanations of the XML tools/resources required to execute the step and rationale of why the step is necessary. Detailed graphics and examples are employed to simplify and justify the step by step explanations. The JavaScript code developed as part of the research to execute the XML based analysis is included. This thesis concludes with discussions of the overall value of this XML based analysis and comparison process and of potential future work...

## A survey and analysis of access control architectures for XML data

Estlund, Mark J.
Relevância na Pesquisa
27.2%
Extensible Markup Language (XML) has had a revolutionary effect on information technology. Both business and government have adopted XML as the format of choice for information sharing. Business uses XML to leverage the full potential of the Internet for e-Commerce. The government wants to leverage the ability to share information across many platforms between divergent agencies. In particular, in August 2004, Executive Order (EO) 13356 called for improved sharing of terrorist information to protect Americans.[1] XML provides a way to format information so that it is interoperable. The economic benefit of sharing data and resources is apparent. Sharing information between government agencies will assist in national security. However, there is still a requirement to control the flow and state of data. Therefore, access controls must be used to ensure data and information are protected. This thesis asks whether it is possible to provide a survey and analysis of how industry is enforcing access control on XML data, information, and documents that could serve as a foundation for XML security architectures for the government.

## Interoperability, data control and battlespace visualization using XML, XSLT and X3D

Neushul, James D.
Relevância na Pesquisa
27.2%
Approved for public release, distribution unlimited; This work represents the realization of Network-Centric goals of interoperability, information management, systems integration and cohesive battlespace visualization using networked computer technology. The application of structured data methodologies using the E xtensible Markup Language (XML) allows organizations and systems to exchange and process battlespace information cooperatively. The practical application of this technology is demonstrated. Governance of information systems using structured data and the rejection of proprietary, application specific solutions is a leadership responsibility that is defined as Data Control. XML is presented as a leadership control measure that can be used to achieve Network-Centricity on the battlefield. The fundamental principles of XML application development are presented in the context of warfighting. Exemplars address a cross-section of battlespace applications. The visualization of the physical battlefield is demonstrated with network delivered 3D terrain views. Geodesy and position reporting is addressed using an XML defined data structure to enforce interoperability. An XML expression of the Battlespace Generic Hub is applied to joint and multilateral interoperability and information exchange. An approach to the effective employment of multiple different...

## Network configuration using XML

EN_US
Relevância na Pesquisa
27.2%
The primary goal of this thesis is to investigate the use of the eXtensible Markup Language (XML) as a network configuration language. Network configuration is a difficult and time- consuming task. Current network configuration solutions are based on proprietary configuration languages and parsers. XML is a platform-neutral data representation language and worldwide standard. It is potentially advantageous to use XML to configure networks, however, XML was not developed for network configuration. A new XML based configuration solution for the Server and Agent Active Network Management System (SAAM) is provided to marshal evidence that XML can be used effectively as a network configuration language

## Management of C4I and M&S Data Standards with Modular OWL Ontologies

Gupton, Kevin; Abbott, Jeff; Blais, Curtis; Diallo, Saikou Y.; Heffner, Kevin; Turnitsa, Chuck
Tipo: Trabalho em Andamento
EN_US
Relevância na Pesquisa
27.2%
Approved for public release; distribution is unlimited.; Documents include Paper & Presentation.; Standard information exchange data models (IEDMs), such as the Joint Consultation Command and Control IEDM (JC3IEDM) managed by the Multilateral Interoperability Programme (MIP) and the National Information Exchange Model (NIEM) managed by the US Department of Homeland Security, often are expressed as XML Schema Definition (XSD) documents. This choice of model representation comes with the benefits of a widely adopted format and a well-supported XML toolset and libraries. Although XML, as a technology, has been an enabler in achieving model alignment and interoperability among C4I and M&S systems, several key issues have not been fully addressed. For instance, XML does not provide a standard means for representing semantics. This means that XML expressions generally cannot be interpreted by applications in a meaningful manner unless specific code has been added for this purpose. In addition, systems utilizing multiple IEDMs are faced with difficult mapping and model translation tasks that cannot easily be automated. Furthermore, the use of multiple IEDMs creates significant maintainability and scalability challenges associated with the use of the relevant standards and specifications. As the user-base of a data standard grows...

## DIS-XML: Moving DIS to Open Data Exchange Standards

McGregor, Don; Brutzman, Don; Armold, Adrian; Blais, Curtis L.
Relevância na Pesquisa
27.2%
The Distributed Interactive Simulation (DIS) IEEE-1278.1 standard is used in many military simulations. The binary data format for DIS does not lend itself to use in emerging web services standards or data analysis and storage tools because the data format is not recognized by most general purpose data manipulation tools. We examine an alternate XML-based representation of DIS information. An XML representation unlocks legacy data by placing it in a standard data format, and thereby integrates with the many XML data transformation, storage, and analysis tools. An XML-based approach also allows easy generation of programming language Application Program Interfaces (APIs). The information contained in DIS PDUs can shift between any of several representations, including the binary IEEE- 1278.1 standard, XML, or programming language objects. The XML representation can be used in web services applications or passed over instant messaging channels. Initial tests demonstrate satisfactory performance.

## Représentation OWL de la ressource lexicale LVF et son utilisation dans le traitement automatique de la langue

Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
Relevância na Pesquisa
27.2%
Le dictionnaire LVF (Les Verbes Français) de J. Dubois et F. Dubois-Charlier représente une des ressources lexicales les plus importantes dans la langue française qui est caractérisée par une description sémantique et syntaxique très pertinente. Le LVF a été mis disponible sous un format XML pour rendre l’accès aux informations plus commode pour les applications informatiques telles que les applications de traitement automatique de la langue française. Avec l’émergence du web sémantique et la diffusion rapide de ses technologies et standards tels que XML, RDF/RDFS et OWL, il serait intéressant de représenter LVF en un langage plus formalisé afin de mieux l’exploiter par les applications du traitement automatique de la langue ou du web sémantique. Nous en présentons dans ce mémoire une version ontologique OWL en détaillant le processus de transformation de la version XML à OWL et nous en démontrons son utilisation dans le domaine du traitement automatique de la langue avec une application d’annotation sémantique développée dans GATE.; The LVF dictionary (Les Verbes Français) by J. Dubois and F. Dubois-Charlier is one of the most important lexical resources in the French language, which is characterized by a highly relevant semantic and syntactic description. The LVF has been available in an XML format to make access to information more convenient for computer applications such as NLP applications for French language. With the emergence of the Semantic Web and the rapid diffusion of its technologies and standards such as XML...

## A Join Index for XML Data Warehouses

Mahboubi, Hadj; Aouiche, Kamel; Darmont, Jérôme
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
XML data warehouses form an interesting basis for decision-support applications that exploit complex data. However, native-XML database management systems (DBMSs) currently bear limited performances and it is necessary to research for ways to optimize them. In this paper, we propose a new join index that is specifically adapted to the multidimensional architecture of XML warehouses. It eliminates join operations while preserving the information contained in the original warehouse. A theoretical study and experimental results demonstrate the efficiency of our join index. They also show that native XML DBMSs can compete with XML-compatible, relational DBMSs when warehousing and analyzing XML data.; Comment: 2008 International Conference on Information Resources Management (Conf-IRM 08), Niagra Falls : Canada (2008)

## An Experimental Investigation of XML Compression Tools

Sakr, Sherif
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
This paper presents an extensive experimental study of the state-of-the-art of XML compression tools. The study reports the behavior of nine XML compressors using a large corpus of XML documents which covers the different natures and scales of XML documents. In addition to assessing and comparing the performance characteristics of the evaluated XML compression tools, the study tries to assess the effectiveness and practicality of using these tools in the real world. Finally, we provide some guidelines and recommen- dations which are useful for helping developers and users for making an effective decision for selecting the most suitable XML compression tool for their needs.; Comment: http://xmlcompbench.sourceforge.net/

## Mapping XML Data to Relational Data: A DOM-Based Approach

Atay, Mustafa; Sun, Yezhou; Liu, Dapeng; Lu, Shiyong; Fotouhi, Farshad
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
XML has emerged as the standard for representing and exchanging data on the World Wide Web. It is critical to have efficient mechanisms to store and query XML data to exploit the full power of this new technology. Several researchers have proposed to use relational databases to store and query XML data. While several algorithms of schema mapping and query mapping have been proposed, the problem of mapping XML data to relational data, i.e., mapping an XML INSERT statement to a sequence of SQL INSERT statements, has not been addressed thoroughly in the literature. In this paper, we propose an efficient linear algorithm for mapping XML data to relational data. This algorithm is based on our previous proposed inlining algorithm for mapping DTDs to relational schemas and can be easily adapted to other inlining algorithms.; Comment: In Proc. of the 8th IASTED International Conference on Internet and Multimedia Systems and Applications (IMSA'04), pp. 59-64, Kauai , Hawaii , USA. August 2004

## XML Information Retrieval Systems: A Survey

Sayed, Awny
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
The continuous growth in the XML information repositories has been matched by increasing efforts in development of XML retrieval systems, in large parts aiming at supporting content-oriented XML retrieval. These systems exploit the available structural information, as market up in XML documents, in order to return documents components- the so called XML elements-instead of the complement documents in repose to the user query. In this paper, we provide an overview of the different XML information retrieval systems and classify them according to their storage and query evaluation strategies.; Comment: 10 pages, 25 references

## XPath-Logic and XPathLog: A Logic-Programming Style XML Data Manipulation Language

May, Wolfgang
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
We define XPathLog as a Datalog-style extension of XPath. XPathLog provides a clear, declarative language for querying and manipulating XML whose perspectives are especially in XML data integration. In our characterization, the formal semantics is defined wrt. an edge-labeled graph-based model which covers the XML data model. We give a complete, logic-based characterization of XML data and the main language concept for XML, XPath. XPath-Logic extends the XPath language with variable bindings and embeds it into first-order logic. XPathLog is then the Horn fragment of XPath-Logic, providing a Datalog-style, rule-based language for querying and manipulating XML data. The model-theoretic semantics of XPath-Logic serves as the base of XPathLog as a logic-programming language, whereas also an equivalent answer-set semantics for evaluating XPathLog queries is given. In contrast to other approaches, the XPath syntax and semantics is also used for a declarative specification how the database should be updated: when used in rule heads, XPath filters are interpreted as specifications of elements and properties which should be added to the database.

## XML Information Retrieval:An overview

D., Suma; Acharya, U. Dinesh; M., Geetha; M, Raviraja Holla
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
Locating and distilling the valuable relevant information continued to be the major challenges of Information Retrieval (IR) Systems owing to the explosive growth of online web information. These challenges can be considered the XML Information Retrieval challenges as XML has become a de facto standard over the Web. The research on XML IR starts with the classical IR strategies customized to XML IR. Later novel IR strategies specific to XML IR are evolved. Meanwhile literatures reveal development of the rapid and intelligent IR systems. Despite their success in their specified constrained domains, they have additional limitations in the complex information space. The effectiveness of IR systems is thus unsolved in satisfying the most. This article attemptsan overview of earlier efforts and the gaps in XML IR.; Comment: 7 pages, 0 figures

## Conception et Evaluation de XQuery dans une architecture de m\'ediation "Tout-XML"

Dang-Ngoc, Tuyet-Tram; Gardarin, Georges
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
XML has emerged as the leading language for representing and exchanging data not only on the Web, but also in general in the enterprise. XQuery is emerging as the standard query language for XML. Thus, tools are required to mediate between XML queries and heterogeneous data sources to integrate data in XML. This paper presents the XMedia mediator, a unique tool for integrating and querying disparate heterogeneous information as unified XML views. It describes the mediator architecture and focuses on the unique distributed query processing technology implemented in this component. Query evaluation is based on an original XML algebra simply extending classical operators to process tuples of tree elements. Further, we present a set of performance evaluation on a relational benchmark, which leads to discuss possible performance enhancements.

## Validating XML Documents in the Streaming Model with External Memory

Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
We study the problem of validating XML documents of size $N$ against general DTDs in the context of streaming algorithms. The starting point of this work is a well-known space lower bound. There are XML documents and DTDs for which $p$-pass streaming algorithms require $\Omega(N/p)$ space. We show that when allowing access to external memory, there is a deterministic streaming algorithm that solves this problem with memory space $O(\log^2 N)$, a constant number of auxiliary read/write streams, and $O(\log N)$ total number of passes on the XML document and auxiliary streams. An important intermediate step of this algorithm is the computation of the First-Child-Next-Sibling (FCNS) encoding of the initial XML document in a streaming fashion. We study this problem independently, and we also provide memory efficient streaming algorithms for decoding an XML document given in its FCNS encoding. Furthermore, validating XML documents encoding binary trees in the usual streaming model without external memory can be done with sublinear memory. There is a one-pass algorithm using $O(\sqrt{N \log N})$ space, and a bidirectional two-pass algorithm using $O(\log^2 N)$ space performing this task.; Comment: Change title. Remove a statement on a lower bound (now Conjecture 2 in Annexe B) since the proof was incomplete

## Efficient XML Keyword Search based on DAG-Compression

Böttcher, Stefan; Hartel, Rita; Rabe, Jonathan
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.2%
In contrast to XML query languages as e.g. XPath which require knowledge on the query language as well as on the document structure, keyword search is open to anybody. As the size of XML sources grows rapidly, the need for efficient search indices on XML data that support keyword search increases. In this paper, we present an approach of XML keyword search which is based on the DAG of the XML data, where repeated substructures are considered only once, and therefore, have to be searched only once. As our performance evaluation shows, this DAG-based extension of the set intersection search algorithm[1], [2], can lead to search times that are on large documents more than twice as fast as the search times of the XML-based approach. Additionally, we utilize a smaller index, i.e., we consume less main memory to compute the results.

## A distributed editing environment for XML documents

Pasquier, Claude; Théry, Laurent
Tipo: Artigo de Revista Científica