eXtensible Markup Language (XML) is one of the most used standards for information sharing between applications and devices, both on the internet and local network. However, relational database (RDB) ...has been used by many enterprises as their data management system and will require an amount of cost to change the system completely, if they are to change to XML technology solely. Thus, a mapping scheme is required to provide seamless integration on bridging XML technologies and RDBs. In this paper, an efficient model-based mapping scheme named XML-REG is proposed. The XML document will first be read and parsed into the parser, namely Streaming API for XML (StAX) parser. Then, each node will then be assigned with unique identification label to show the exact position of nodes in the document. Subsequently, by employing the proposed algorithm, data will then be transformed into tables in the RDB storage. As the result, two tables, namely (i) value table to store information carried by text node of the document, and (ii) path table to store the hierarchy structure of the document will be created. Experimental evaluations demonstrated that XML-REG outperformed some existing approaches, such as Mini-XML, XAncestor, XMap and XRecursive in terms of data storage size, mapping time and query retrieval time. In addition, the scalability test has also been conducted to show the capability of these approaches in supporting huge datasets, by scaling the DBLP dataset by times 5, times 10 and times 15. The results showed that XML-REG has the closest to linear graph compared to other existing approaches. On average, XML-REG showed the best performance in terms of query retrieval time and database storage size.
Supporting the execution of transactions through the use of electronic documents requires security. The scope of this security primarily involves ensuring the integrity, authenticity and ...non-repudiation of the origin of information. The signed XML document is a powerful tool that ensures the above features and the ease of processing and integration with various systems. An XML document may have many signatures, and each of them may sign different parts of the document. This feature is highly attractive, but in order to use it, the signature and structure of the document must be carefully designed. This article presents the existing risks associated with the use of XML signatures, focusing on XML signature wrapping vulnerability. This vulnerability is a consequence of the relationship between the XML signature and the signed document. The authors suggest that without neglecting the need for protection against the possibility of moving and replacing a fragment of the document, the use of secure XML signature references should also be considered and applied. The article proposes the use of secure signature templates as a countermeasure against the threat of an improper indication of the signed content defined in the signature reference. This threat is serious in automatic signature processing, where it is important to correctly indicate the signed content.
•An encoding scheme named Pathed-Dewey Order for nodes in XML documents.•An XML-to-HBase mapping strategy based on Pathed-Dewey Order.•An algorithm to translate XPath into query operations on HBase ...tables.•Supports efficient storage and query of large collections of small XML documents.•A superior performance of XML2HBase over existing solutions in target use cases.
Many big data applications such as smart transportation, healthcare, and e-commerce need to store and query large collections of small XML documents, which has become a fundamental problem. However, existing solutions are inadequate to deliver satisfactory query performance in such circumstances. In this paper, we propose a framework named XML2HBase to address this problem using HBase, a widely deployed NoSQL database. Within this framework, we design a novel encoding scheme called Pathed-Dewey Order and a two-layer mapping method to store XML documents in HBase tables. XML queries, which are represented as XPath expressions, are evaluated through their translation into queries over HBase tables. Based on an in-depth analysis of the characteristics of the proposed approach, we design and integrate four optimization strategies to reduce storage space and query response time. Extensive experiments on two well-known XML benchmarks demonstrate the superior performance of XML2HBase over three state-of-the-art methods.
Focusing on standards that are relevant to almost all developers working with XML, this book investigates XML technologies that span a wide range of XML applications and provides numerous code ...samples that show exactly how XML is used in myriad applications. --
With the expanding prevalence of XML information and a extraordinary requirement for an information base administration framework ready to store, recover and control XML-based information in an ...effective way, information base exploration networks and programming businesses have attempted to react to this necessity. XML-empowered information base and local XML information base are two methodologies that have been proposed to address this test. These two methodologies are an inheritance information base framework which are stretched out to store, recover and control XML-based information. The significant goal of this paper is to investigate and look at between the two methodologies and reach to a few measures to have a reasonable rule to choose the best approach in every situation. When all is said in done, local XML information base frameworks have greater capacity in correlation with XML-empowered information base framework for overseeing XML-based information.
Querying XML Jim Melton, Stephen Buxton
2011, 2006, 2011-04-08
eBook
XML has become the lingua franca for representing business data, for exchanging information between business partners and applications, and for adding structure– and sometimes meaning—to text-based ...documents. XML offers some special challenges and opportunities in the area of search: querying XML can produce very precise, fine-grained results, if you know how to express and execute those queries.For software developers and systems architects: this book teaches the most useful approaches to querying XML documents and repositories. This book will also help managers and project leaders grasp how "querying XML? fits into the larger context of querying and XML. Querying XML provides a comprehensive background from fundamental concepts (What is XML?) to data models (the Infoset, PSVI, XQuery Data Model), to APIs (querying XML from SQL or Java) and more.* Presents the concepts clearly, and demonstrates them with illustrations and examples; offers a thorough mastery of the subject area in a single book. * Provides comprehensive coverage of XML query languages, and the concepts needed to understand them completely (such as the XQuery Data Model). * Shows how to query XML documents and data using: XPath (the XML Path Language); XQuery, soon to be the new W3C Recommendation for querying XML; XQuery's companion XQueryX; and SQL, featuring the SQL/XML * Includes an extensive set of XQuery, XPath, SQL, Java, and other examples, with links to downloadable code and data samples.
eXtensible Markup Language (XML) is used widely to transfer data among a wide variety of systems. Due to an increase in query workloads and management of larger datasets, centralized processing is no ...longer feasible for XML query processing. To address this issue, we propose a technique that improves XML query processing through query workload distribution. An effective distributed XML query processing can be affected by several criteria such as indexing, fragmentation, distribution strategy, and well as the query handling in the distributed servers. However, we believe that an efficient labeling mechanism and an inexpensive centralized query processors or a pruning method at dedicated servers contribute greatly to the overall performance of a distributed query processor. In this paper, we present an effective centralized pruning technique that is adopted into our proposed distributed XML query processing technique to process XML queries robustly. Experimental evaluations showed that the proposed distributed query processor superseded the performance of centralized query processor.
•A new structure for streaming the XML data is proposed which guarantees confidentiality of the XML data over the wireless stream.•An access mechanism is proposed to efficiently process XML queries ...over the encrypted XML stream.
Recently, the use of XML for data broadcasting in mobile wireless networks has gained many attentions. One of the most essential requirements for such networks is data confidentiality. In order to secure XML data broadcast in mobile wireless networks, mobile clients should obey a set of access authorizations specified on the original XML document. In such environments, mobile clients can only access authorized parts of encrypted XML stream based on their access authorizations. Several indexing methods have been proposed in order to have selective access to XML data over the XML stream. However, these indexing methods cannot be used for encrypted XML data. In this paper, we define a new structure for XML stream which supports data confidentiality of XML data over the wireless broadcast channel. We also define an access mechanism for our proposed structure to efficiently process XML queries over the encrypted XML stream. The experimental results demonstrate that the use of our proposed structure and access mechanism for XML data broadcast efficiently disseminates XML data in mobile wireless networks.
Energy-related occupant behavior in buildings is difficult to define and quantify, yet critical to our understanding of total building energy consumption. Part I of this two-part paper introduced the ...DNAS (Drivers, Needs, Actions and Systems) framework, to standardize the description of energy-related occupant behavior in buildings. Part II of this paper implements the DNAS framework into an XML (eXtensible Markup Language) schema, titled ‘occupant behavior XML’ (obXML). The obXML schema is used for the practical implementation of the DNAS framework into building simulation tools. The topology of the DNAS framework implemented in the obXML schema has a main root element OccupantBehavior, linking three main elements representing Buildings, Occupants and Behaviors. Using the schema structure, the actions of turning on an air conditioner and closing blinds provide two examples of how the schema standardizes these actions using XML. The obXML schema has inherent flexibility to represent numerous, diverse and complex types of occupant behaviors in buildings, and it can also be expanded to encompass new types of behaviors. The implementation of the DNAS framework into the obXML schema will facilitate the development of occupant information modeling (OIM) by providing interoperability between occupant behavior models and building energy modeling programs.
•An occupant behavior XML schema obXML is developed based on the DNAs framework.•The obXML provides a standardize representation of occupant behavior in buildings.•The obXML is used to describe windows opening and blinds closing behavior as examples.•The obXML is generic and flexible for expansion to describe new occupant behavior.•The obXML schema is planned to integrate with building information modeling.
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