XML and Web Technologies for Data Sciences with R (Use R!) by Deborah Nolan, Duncan Temple Lang

By Deborah Nolan, Duncan Temple Lang

Web applied sciences are more and more suitable to scientists operating with facts, for either getting access to information and developing wealthy dynamic and interactive displays.  The XML and JSON facts codecs are established in net companies, general websites and JavaScript code, and visualization codecs reminiscent of SVG and KML for Google Earth and Google Maps.  moreover, scientists use HTTP and different community protocols to scrape facts from web content, entry leisure and cleaning soap internet providers, and have interaction with NoSQL databases and textual content seek applications.  This ebook presents a realistic hands-on creation to those applied sciences, together with high-level services the authors have constructed for information scientists.  It describes ideas and techniques for extracting facts from HTML, XML, and JSON codecs and the way to programmatically entry info from the Web. 

Along with those common abilities, the authors illustrate a number of purposes which are proper to info scientists, reminiscent of interpreting and writing spreadsheet records either in the community and through Google medical doctors, developing interactive and dynamic visualizations, exhibiting spatial-temporal screens with Google Earth, and producing code from descriptions of information buildings to learn and write data.  those subject matters show the wealthy probabilities and possibilities to do new issues with those smooth technologies.  The ebook comprises many examples and case-studies that readers can use at once and adapt to their very own work.  The authors have fascinated about the mixing of those applied sciences with the R statistical computing environment.  even if, the information and abilities provided listed here are extra normal, and statisticians who use different computing environments also will locate them appropriate to their work.

Deborah Nolan is Professor of records at collage of California, Berkeley.

Duncan Temple Lang is affiliate Professor of information at college of California, Davis and has been a member of either the S and R improvement teams.

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XML and Web Technologies for Data Sciences with R (Use R!)

Net applied sciences are more and more appropriate to scientists operating with facts, for either gaining access to info and growing wealthy dynamic and interactive displays.  The XML and JSON info codecs are standard in net companies, normal web content and JavaScript code, and visualization codecs similar to SVG and KML for Google Earth and Google Maps.

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Environmental Protection Agency (EPA). 2 Essentials of XML 23 26 28 5,1,2,8,6,3,7,5,3,4 These two documents provide examples of the various parts of an XML document. The remainder of this chapter fills in the details. 7 describes the XML grammar, called XML Schema, that is used to define allowable tags and structures in an XML grammar. 2 Essentials of XML The basic unit in XML is the element, which we also refer to as a node when we talk about the hierarchical or treelike structure of the XML document.

As consumers of data, we work with whatever format the data are made available to us. Features of XML • XML is self-describing in that it can contain the format and structural information needed to properly read and interpret the content. For example, an XML document typically specifies its character encoding in the XML declaration. It can contain a DTD or schema that describes the structure of all documents within that XML vocabulary. For traditional data sets, it can include the missing value identifier, description of its provenance, etc.

Attribute values have a name="value" format and the value must be quoted either with matching single or double quotes, but not mixed. • Attribute names cannot be repeated within a given element (except if they are within different namespaces). • No blank space is allowed between the < character and the tag name. Extra space is allowed before the ending > in the opening and closing tag. The blank space after the element name is to separate the tag from the first attribute, if it is present. • Element and attribute names must begin with an alphabetic character or an underscore _; subsequent characters may include digits, hyphens, and periods.

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