By James Keogh
The quick and straightforward option to examine XML
Start programming in XML straight away utilizing this easy-to-follow consultant. XML Demystified explains the right way to construct XML net functions that paintings on any platform or browser. step by step directions with plenty of examples assist you research quickly.
This distinct self-teaching textual content offers:
An effortless approach to comprehend XML
A quiz on the finish of every chapter
A ultimate examination on the finish of the book
No pointless technical jargon
A time-saving approach
The publication starts by way of introducing you to the construction blocks of XML. Then, youll know about XML files, rfile style definitions (DTDs), XML schema, XLink, XPath, XPointer, XSLT, XML parsers, RSS, XQuery, and MSXML. that includes end-of-chapter quizzes and a last examination, this publication could have you growing XML purposes in no time.
Simple adequate for a newbie, yet demanding adequate for a sophisticated pupil, XML Demystified is your shortcut to studying this strong programming language
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Additional resources for XML Demystified
Sample text
An EMPTY element indicates that the element does not have a child node. That is, it doesn’t have child elements or PCDATA. An ANY element means that anything can be used as a child element. The image element (img) is a good example of an EMPTY element because an image element doesn’t contain data. It does reference an image file, but the reference is an attribute of the element rather than information contained within the element. gif"> You commonly use the ANY element when you’re updating a DTD to accommodate multiple versions of XML.
Various techniques are used to traverse the tree to local information contained in the XML document. You can also use DOM to write data to the XML document, but it’s limited to working with small XML documents because the entire XML document is placed in memory. SAX reads the XML document, noting the locations of markup tags. The SAX parser makes a one-time pass through the XML from start to finish. As it encounters tags and data, it calls events that you define in your code. SAX is ideal for reading large XML documents because there aren’t any memory constraints; only a chunk of the XML document is ever in memory at one time.
35 XML Demystified 36 Let’s convert the internal DTD we showed you in the previous example into an external DTD and then reference the DTD from an XML document. The first step is to copy the DTD into its own file. You can do this using any text editor. dtd. The file name should represent the contents of the file. ELEMENT customers (customer*)> customer (name, title, company, address, phone, email, account_number)> name (first_name, last_name)> address (street_1, street_2, city, state, zip)> phone (business, cell, home, fax)> first_name (#PCDATA)> last_name (#PCDATA)> title (#PCDATA)> company (#PCDATA)> street_1 (#PCDATA)> street_2 (#PCDATA)> city (#PCDATA)> state (#PCDATA)> zip (#PCDATA)> business (#PCDATA)> cell (#PCDATA)> home (#PCDATA)> fax (#PCDATA)> email (#PCDATA)> account_number (#PCDATA)> The last step is to reference the external DTD from an XML document.