Web Document Hypermedia Concept a Called a web page Web document contains mixture of a One web page per file Binary image Selectable pointers to other Web pages Specifies contents and layout Known as Hypertext Markup Language(HTML) Hypermedia Link On A Web document Terminology Associated with object or area on Markup language Gives general layout gu Internally like a symbolic link Does not specify exact placement or Advantage Can reference document on another computer Disadvantage Can become invalid Consequence of Using A Markup Language 事"Moee Web documents use the Document is free-format epresentation Embedded tags give display Instead of specifying a detailed defines document format alows a document to contain genera/ guide lines Tags often appear in pairs for display, and allows a browser to choose details. Consequently, two Beginning tag:<TAGNAME browsers may display an HTML document different3 哈工大计算机学院 李全龙 Network Application Development Server Software Design 13 Web Document „ Called a web page „ One web page per file „ Can contain „ Binary image „ Text file „ Text standard „ Readable representation ASCII „ Specifies contents and layout „ Known as Hypertext Markup Language (HTML) 哈工大计算机学院 李全龙 Network Application Development Server Software Design 14 Hypermedia Concept „ Web document contains mixture of „ Text „ Images „ Selectable pointers to other Web pages „ Known as hypermedia 哈工大计算机学院 李全龙 Network Application Development Server Software Design 15 Hypermedia Link On A Web Document „ Associated with object or area on screen „ Internally like a symbolic link „ Advantage „ Can reference document on another computer „ Disadvantage „ Can become invalid 哈工大计算机学院 李全龙 Network Application Development Server Software Design 16 Terminology „ Markup language „ Gives general layout guidelines „ Does not specify exact placement or format 哈工大计算机学院 李全龙 Network Application Development Server Software Design 17 Consequence of Using A Markup Language Web documents use the HyperText Markup Language representation. Instead of specifying a detailed document format, HTML allows a document to contain general guidelines for display, and allows a browser to choose details. Consequently, two browsers may display an HTML document differently. 哈工大计算机学院 李全龙 Network Application Development Server Software Design 18 HTML Details „ Document is free-format „ Embedded tags give display guidelines „ Tags often appear in pairs „ Tag format „ Beginning tag: <TAGNAME> „ Ending tag: </TAGNAME>