Dynamic Web File Format Transformations with Grace Daniel S. Swaney, Frank McCown, and Michael L. Nelson Old Dominion University Computer Science Department.

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Presentation transcript:

Dynamic Web File Format Transformations with Grace Daniel S. Swaney, Frank McCown, and Michael L. Nelson Old Dominion University Computer Science Department Norfolk, Virginia, USA IWAW05 September 23, 2005

IWAW052 Time XBM Current browser accessible formats GIFPNG JP2 PS PDF

IWAW053 Time XBM Current browser accessible formats Grace accessible formats GIFPNG JP2 PS PDF

Date last modified:

IWAW055 Related Work Typed Object Model (TOM) TOM Conversion Service JSTOR/Harvard Object Validation Environment (JHOVE) LOCKSS (Lots of Copies Keep Stuff Safe)

IWAW056 High Level Design

IWAW057 Configuring Grace End-User Profile - Uniquely identifies a user or group of users’ preferences - Contains a list of one or more transform rules to follow

IWAW058 Configuring Grace End-User Profile - Rules for converting one type into another - Example: image/x-xbitmap  image/png - Multiple transformations can be performed on the same object Transform …

IWAW059 Grace in Action 1. Test formats that are commonly available by most web browsers. 2. Test the PNG format that is improperly displayed by a variety of web browsers. 3. Test the JPEG 2000 format which can only be displayed using a browser plug- in.

IWAW0510 XBM Format image/x−xbitmap  image/png

IWAW0511 PNG Format Correct rendering IE rendering Grace conversion (lossy) image/png  image/bitmap

IWAW0512 JPEG 2000 Format image/jp2  image/jpeg

IWAW0513 Future Work Additional types of transformations TOM conversion service Improve file format metadata JHOVE Faster translation of Web content Cache conversions Convert before accessing Scalable network of Grace servers OAI-PMH used for communication

IWAW0514 Future Work Find missing Web content archive.org Search engine caches Translation rules based on browser capabilities Discover what transformations are needed Transformation Metadata How will the user know something has been transformed? Will they want to know?

IWAW0515 Thank You Questions? Slides: