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Total Articles: 3,169


xql Articles
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Multimedia Information Services Enabling: An Architectural Approach
This paper presents a scaleable and extendable architecture consisting of the essential building blocks for multimedia information services. It provides building blocks for multimedia transport, storage, retrieval, filtering, and presentation, together with their interdependencies. After presenting the overall architecture, we focus in more detail on the 3-level modeling and querying of multimedia data.

Type: XQL  #Views: 553  Category: Article    

More Sybase ASE and XQL
In this article, I’ll prepare and configure Sybase Adaptive Server Enterprise (ASE) for XQL. I’ll cover installing XML and XQL in Sybase ASE, including performance considerations, and discuss basic capabilities available on both the client and server.

Type: XQL  #Views: 693  Category: Article    

Take advantage of XQL in Sybase ASE
Learn the basics of XQL so you can begin to understand the flexibility afforded in designing client/server, n-tier, and Web applications in Java using Sybase ASE as the database repository.

Type: XQL  #Views: 643  Category: Article    

An Engine for Querying XML
The ability to search XML documents received a lot of attention in late 2000. We will most likely continue to see this as a focus in 2001. Several commercial products exist that address indexing and searching of XML documents. In the context of development, there are also many instances where search becomes a necessary function either as a feature of the application or as a productivity/testing tool for the developer. XML searches can be grouped into two categories. The first would be structural searches. Given the inherent hierarchical structure of XML, it is possible to come up with searches like second child node of the element X. DOM can be used for such searches since a DOM tree is an in-memory representation of the XML document. The other type of search would be full-text search where you are just looking for a particular word or combination of words.

Type: XQL  #Views: 688  Category: Article    

Xtract: a query language for XML documents
Xtract is a query language heavily based on XQL: it tidies up some inconsistencies, and is smaller even though it makes some extensions. The idea of Xtract is that it can be used as a kind of XML-grep at the command-line, but it could also be used within a scripting language (such as the Haskell XML combinator library) as a shorthand for a complicated selection filter.

Type: XQL  #Views: 486  Category: Article    

XML-GL: a Graphical Language for Querying and Restructuring XML Documents
The widespreading of XML as a standard for semi-structured documents on the Web opens up challenging opportunities for Web query languages. In this paper we introduce XML-GL, a graphical query language for XML documents. The use of a visual formalism for representing both the content of XML documents (and of their DTDs) and the syntax and semantics of queries enables an intuitive expression of queries, even when they are rather complex.

Type: XQL  #Views: 506  Category: Article    

Do we really need a new query language for XML?
XML [XML98] has been proposed as a successor of HTML conceived to ease the task of exchanging, manipulating and reusing data on the Internet (and in other frameworks). The main advantage of XML with respect to its predecessor is a clear separation between the ways in which data, structure (DTD) and layout (stylesheet) are encoded. At the same time, XML preserves and enhances the hypertextual linking mechanism [XLink98, XPointer98] that has been so successful for HTML. It is therefore presumable that we will very soon witness the emergence of XML repositories on the Web, i.e., large collections of Internet-available linked XML documents.

Type: XQL  #Views: 480  Category: Article    

A Data Model and Query Language for XML
With XML poised to become the de facto language for representing internet data, accessing and querying this data has become increasingly important. To query XML documents efficiently, we developed the QuiXote query processing system. The first step in designing a query processing system is to define an appropriate data model. QuiXote uses the QNX data model that captures the entire DTD semantics, as well as the structure, content and link information present in an XML document. For querying, QuiXote uses the QNX query language, which is a DTD-based query language for XML.

Type: XQL  #Views: 495  Category: Article    

Query Language Needs of Large, Heterogeneous Organizations
The MITRE Corporation provides technical assistance, system engineering, and acquisition support to U.S. Government agencies and other large organizations. Our customers have high (not always realistic) hopes for XML and related standards.

Type: XQL  #Views: 235  Category: Article    

Java allows Sybase and XQL integration
Sybase ASE provides full XML and XQL support, and Java can be used to easily work with the new features. Here are some examples of how it works.

Type: XQL  #Views: 275  Category: Article    

RDF Query Languages: A state-of-the-art
Several approaches have been proposed, as far as querying RDF metadata is concerned. These approaches can be generally subdivided into two main categories:

Type: XQL  #Views: 248  Category: Article    

Java allows Sybase and XQL integration
Using XQL to query Java and XML data in client/server and distributed environments requires more than the ability to use it on the database server. In this article, I’ll explore using XQL to retrieve results from Sybase ASE from a stand-alone client application, a JDBC client, and an Enterprise JavaBean (EJB) server bean and client. I’ll also examine the surprisingly few methods needed to facilitate this powerful technology.

Type: XQL  #Views: 320  Category: Article    

Using Query Languages as Mapping Tools
Mapping data from deeply hierarchical data structures is a challenging and time-consuming task for webMethods developers. The underused and powerful pub.web:queryDocument service can drastically simplify this process.

Type: XQL  #Views: 338  Category: Article    

Writing and Debugging XQuery Web Apps with Qexo
In this article we will show to to write and install a very simple web application written in the XQuery language. We will also show you how errors are handled, and how you can debug them. Our application uses the servlet extension of Qexo (version 1.7beta2 or later), a free software implementation of XQuery.

Type: XQL  #Views: 254  Category: Article    

Querying XML
XML documents are structured documents - they blur the distinction between data and documents, allowing documents to be treated as data sources, and traditional data sources to be treated as documents. Some XML documents are nothing more than an ASCII representation of data that might traditionally have been stored in a database. Others are documents that contain very little structure beyond the use of headers and tables.

Type: XQL  #Views: 265  Category: Article    

Considering XSL Extensions, XQL and Other Proposals
It was also clear that there are many different ways to design a query language. There's even the concern that we don't necessarily need only one standardized means of walking a document tree or looking up items in a table. But it is becoming increasingly important to have a standard query language that works across many different systems.

Type: XQL  #Views: 229  Category: Article    

Considering XSL Extensions, XQL and Other Proposals
It was also clear that there are many different ways to design a query language. There's even the concern that we don't necessarily need only one standardized means of walking a document tree or looking up items in a table. But it is becoming increasingly important to have a standard query language that works across many different systems.

Type: XQL  #Views: 198  Category: Article    

XML grows up with intro of XQL
XML took a basic but crucial step toward maturity today with the World Wide Web Consortium's introduction of XQL, a querying language for XML documents.

Type: XQL  #Views: 321  Category: Article    

XQL: Proposal for a new XML Query Language
Representatives from Microsoft, Texcel and WebMethods have submitted to the W3C a position paper that proposes using XSL as the basis for a general-purpose query language for XML documents.

Type: XQL  #Views: 250  Category: Article    

Using XSL and XQL for efficient, customised access to dictionary information
XML is highly suited to representing richly structured information such as dictionary content, and conversely this well-structured storage of the information enables innovative browsing interfaces. We demonstrated this previously with the development of Kirrkirr, a web-based application that allows users to interactively explore a Warlpiri (a Central Australian language) dictionary in XML format.

Type: XQL  #Views: 311  Category: Article    

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