PART 7

• XML (extended markup language) - simpler version of SGML for web applications
• SGML (standardized generalized markup language) - regarded as structured objects
• RTF (rich text format) - text plus formatting and layout information
• UTF - 8-bit encoding of 16 bit character set
• ASCII - 7-bit binary code for to each letter and character
• Audio/Video • lots of formats : (QuickTime, MPEG, WAV, etc.) • compression even more important • also ‘streaming’ formats for network delivery
• Images • many storage formats : (PostScript, GIF, JPEG, TIFF, PICT, etc.) • plus different compression techniques (to reduce their storage requirements)
• FINITE PROCESSING SPEED • Designers tend to assume fast processors, and make interfaces more and more complicated
• network delays – slow feedback
• conflicts - many people update data o unpredictability
• NETWORKED COMPUTING • Networks allow access to: o large memory and processing o other people (groupware, email) o shared resources – esp. the web • Issues o network delays o conflicts
• INTERNET • the global system of interconnected computer networks that uses the Internet protocol suite
• INTERNET • the global system of interconnected computer networks that uses the Internet protocol suite
• common language (protocols): o TCP – Transmission Control protocol o lower level, packets (like letters) between machines o IP – Internet Protocol o reliable channel (like phone call) between programs on machines o email, HTTP, all build on top of these