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Intro to Databases, Video Lecture 4: XML Data, Introduction, Well-formed XML | Megan Taylor

Megan Taylor

front-end dev, volunteacher, news & data junkie, bibliophile, Flyers fan, sci-fi geek and kitteh servant

Intro to Databases, Video Lecture 4: XML Data, Introduction, Well-formed XML

Extensible Markup Language (XML)
standard for data representation and exchange
document format similar to HTML
– tags describe content instead of formatting
also streaming format

Basic constructs
tagged elements (nested)
attributes
text

“Well-formed” XML
adheres to basic structural requirements
– single root element
– matching tags, proper nesting
– unique attributes with elements

test XML structure with XML parser
parsed XML: DOM, SAX

Displaying XML
as XML document
use XSL (extensible stylesheet language) or CSS

Relational Model vs. XML

  relational xml
structure tables hierarchical tree
schema fixed in advance flexible, “self-describing”
queries simple langs less so
ordering unordered implied ordering
implementation native add-on

October 23, 2011 | Comments Off on Intro to Databases, Video Lecture 4: XML Data, Introduction, Well-formed XML | Categories: Posts | Permalink

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