An Introduction To Xml And Web Technologies Pdf
Web technologies are increasingly relevant to scientists working with data, for both accessing data and creating rich dynamic and interactive displays. The XML and JSON data formats are widely used in Web services, regular Web pages and JavaScript code, and visualization formats such as SVG and KML for Google Earth and Google Maps. In addition, scientists use HTTP and other network protocols to scrape data from Web pages, access REST and SOAP Web Services, and interact with NoSQL databases and text search applications. This book provides a practical hands-on introduction to these technologies, including high-level functions the authors have developed for data scientists. It describes strategies and approaches for extracting data from HTML, XML, and JSON formats and how to programmatically access data from the Web.Along with these general skills, the authors illustrate several applications that are relevant to data scientists, such as reading and writing spreadsheet documents both locally and via GoogleDocs, creating interactive and dynamic visualizations, displaying spatial-temporal displays with Google Earth, and generating code from descriptions of data structures to read and write data.
An Introduction To Xml And Web Technologies
These topics demonstrate the rich possibilities and opportunities to do new things with these modern technologies. The book contains many examples and case-studies that readers can use directly and adapt to their own work. The authors have focused on the integration of these technologies with the R statistical computing environment.
However, the ideas and skills presented here are more general, and statisticians who use other computing environments will also find them relevant to their work.Deborah Nolan is Professor of Statistics at University of California, Berkeley.Duncan Temple Lang is Associate Professor of Statistics at University of California, Davis and has been a member of both the S and R development teams.
XML Does Not Use Predefined TagsThe XML language has no predefined tags.The tags in the example above (like and ) are not defined in any XML standard. These tags are 'invented' by the author of the XML document.HTML works with predefined tags like, etc.With XML, the author must define both the tags and the document structure.XML is ExtensibleMost XML applications will work as expected even if new data is added (orremoved).Imagine an application designed to display the original version of note.xml( ).Then imagine a newer version of note.xml with added and elements, and a removed.The way XML is constructed, older version of the application can still work.
NoteTo: ToveFrom: JaniDate: 2015-09-01 08:30Don't forget me this weekend!XML Simplifies Things. It simplifies data sharing. It simplifies data transport. It simplifies platform changes. It simplifies data availabilityMany computer systems contain data in incompatible formats. Exchanging databetween incompatible systems (or upgraded systems) is a time-consuming taskfor web developers.
Mastering Xml Pdf
Large amounts of data must be converted, and incompatible data isoften lost.XML stores data in plain text format. This provides a software- andhardware-independent way of storing, transporting, and sharing data.XML also makes it easier to expand or upgrade to new operating systems, newapplications, or new browsers, without losing data.With XML, data can be available to all kinds of 'readingmachines' like people, computers, voice machines, news feeds, etc.XML is a W3C RecommendationXML became a W3C Recommendation as early as in February 1998.