San Diego Supercomputer Center University of California, San Diego The MIX Project Native XML Database XML View(s) Wrappers export: 1. Schemas & Metadata (XML-Data, RDF,...) 2. Description of supported queries... Wrapper Legacy Source XML query language Wrapper Legacy Source XML View(s) XML documents The vision : Web information sources form a distributed database, using XML as the data model

San Diego Supercomputer Center University of California, San Diego Mediated XML views Data Source XML Data Source Data Source MIXmMediator XML View(s) Blended Browsing and Querying (BBQ) interface XML View(s) Definition of mediated view in XML Matching And Structuring (XMAS) query language Wrapper Lazy evaluation of XMAS queries using DOM-VXD, Partial Object Interchange

San Diego Supercomputer Center University of California, San Diego XML query MIX-DL: A MIX-based Digital Library Architecture Mediator Wrapper Browsing/Querying Client Non-XML source XML document XML Source SRB/MCAT HPSS Request for data (X.509) Data file Wrapper Non-XML source Querying of metadata

San Diego Supercomputer Center University of California, San Diego XMAS query California Digital Library (CDL) Prototype The Art Museum Image Consortium (AMICO) MIXm View based on AMICO DTD Wrapper BBQ Interface MARC Database XML doc AMICO XML Database AMICO XML Database SRB/MCAT HPSS Request for image (X.509) tif file Q1: Find title, type, and image ID of paintings Q2: Find creator and related metadata of paintings

San Diego Supercomputer Center University of California, San Diego XMAS Query The Homebuyer Scenario MIXm Mediator N’hood info (demographics) “Neighborhood” mediator Web Client “Homes” mediator Results (XML) Community info (name, ZIP) Crime info (ZIP, stats) Home info (real estate) Schools info (address, size) School district info (scores,spending,ZIP) “Schools” mediator National test scores Data Find homes in the Del Mar region, with at least 2 beds, 2 baths, and a pool, and an elementary school in the neighborhood.

San Diego Supercomputer Center University of California, San Diego MIX Components - Wrappers Wrapper toolkit model information in a resource using XML DTD (or, XML schema), including a mapping of source data to DTD provide mapping from XML query language to source query language / operations Source-specific wrappers: Relational schemas (XViews)--mapping XMAS to SQL GIS (Arc/View, MapObjects) HTML Wrappers Interactive Web sites

San Diego Supercomputer Center University of California, San Diego MIX Components - Mediator Mediator toolkit allows definition of views across multiple resources views are expressed in a declarative query language query engine to execute queries on views Mediation of spatial sources Support for “external” functions

San Diego Supercomputer Center University of California, San Diego MIX components - XMAS, VXD XML Matching And Structuring (XMAS) query language operates on a given set of XML documents to produce a new XML documents, using XMAS algebra DOM-VXD: DOM Virtual XML Document extension a “lazy” implementation of DOM. Supports browsing/ navigation of XML documents with a server-side, “compute as you go” model

San Diego Supercomputer Center University of California, San Diego MIX components - POIF, BBQ Partial Object Interchange Format (POIF) Related to W3C Fragment Interchange Standard Stanford SDLIP: Simplified Digital Library Interop Protocol Blended Browsing and Querying (BBQ) interface supports navigation and querying of XML documents generates XMAS queries on mediator views generates XMAS queries modified by DOM-VXD operations to incrementally evaluate the result set, to support navigation of XML documents

San Diego Supercomputer Center University of California, San Diego The MIX Project Team UCSD CSE Prof. Yannis Papakonstantinou Prof. Victor Vianu Pavel Velikhov Vincent Chu Michail Petropoulos SDSC DICE Chaitan Baru Amarnath Gupta Bertram Ludaescher Richard Marciano Paul Nguyen Kevin Munroe Bing Zhu