DBMS - (4) XML(Extensible Markup Language)

DBMS - (4) XML(Extensible Markup Language)

structuring data의 한 방법으로서 relation model외의 또 다른 방법, XML

<그림 1: XML Example>

Extensible Markup Language(XML)
- Standard for data representation and exchange
- Document format similar to HTML
- Also streaming format
- nested구조에서 개수의 제한이 없음(flexible)

XML Basic constructus
(1) Tagged elements(nested)
(2) Attributes
(3) Text

	Relation Model	XML
Structure	Tables	Hierarchical tree, graph
Schema	Fixed in advance	Flexible 'self-describing'
queries	Simple, nice language	a little hard
ordering	none	implied
implementation	native	add-on

 

Well-formed XML
- Adhere to basic structural requirements
(1) Single root element
(2) Matched tags, proper nesting
(3) Unique attributes within elements

<그림 2: XML Parser>

Reference
https://www.youtube.com/watch?v=x8kMELlNaYg&list=PL6hGtHedy2Z4EkgY76QOcueU8lAC4o6c3&index=4