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copy-of(.) versus snapshot(.)

copy-of(.) versus snapshot(.). Consider this XML.

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copy-of(.) versus snapshot(.)

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  1. copy-of(.)versussnapshot(.)

  2. Consider this XML <br:Bridgexmlns:gml="http://www.opengis.net/gml/3.2"xmlns:br="http://www.bridge.org"gml:id="Iowa-IllinoisMemorialBridge"><gml:description> The Interstate 74 Bridge, originally known as the Iowa-Illinois Memorial Bridge, and often called The Twin Bridges, or the I-74 Bridge, is a pair of suspension bridges that cross the Mississippi River and connect Bettendorf, Iowa and Moline, Illinois.</gml:description><gml:identifiercodeSpace="http://iowadot.gov">#8205,OL074 8205,OR074</gml:identifier><gml:name>I-74 Bridge</gml:name><gml:name>Twin Bridge</gml:name><gml:boundedBy><gml:EnvelopesrsName="http://earth-info.nga.mil/GandG/wgs84/index.html"><gml:lowerCorner>41.512674 -90.513161</gml:lowerCorner><gml:upperCorner>41.524113 -90.51299</gml:upperCorner></gml:Envelope></gml:boundedBy><br:length>3,372 feet (1,028 m)</br:length><br:width>27 feet (8 m)</br:width><br:spans>Mississippi River</br:spans></br:Bridge> Let this be the context node The next slide shows this document’s tree view 

  3. Document / PI <?xml version="1.0"?> Element br:Bridge Attribute gml:id=Iowa-IllinoisMemorialBridge . . . • Element • gml:identifier • Element • gml:name • Element • gml:name • Element • gml:boundedBy Element gml:description Attribute codespace=http://iowadot.gov context node • Text • #8205,OL074 • … • Text • I-74 Bridge • Text • Twin Bridge • Element • gml:Envelope Text The Interstate 74 Bridge … Attribute srsName=http://earth-info.nga.mil • Element • gml:lowerCorner • Element • gml:upperCorner Text 41.512674 -90.513161 Text 41.524113 -90.51299

  4. Document / PI <?xml version="1.0"?> Element br:Bridge Attribute gml:id=Iowa-IllinoisMemorialBridge . . . • Element • gml:identifier • Element • gml:name • Element • gml:name • Element • gml:boundedBy Element gml:description Attribute codespace=http://iowadot.gov copy-of(.) • Text • #8205,OL074 • … • Text • I-74 Bridge • Text • Twin Bridge • Element • gml:Envelope Text The Interstate 74 Bridge … Attribute srsName=http://earth-info.nga.mil • Element • gml:lowerCorner • Element • gml:upperCorner Text 41.512674 -90.513161 Text 41.524113 -90.51299

  5. Document / PI <?xml version="1.0"?> Element br:Bridge Attribute gml:id=Iowa-IllinoisMemorialBridge . . . • Element • gml:identifier • Element • gml:name • Element • gml:name • Element • gml:boundedBy Element gml:description Attribute codespace=http://iowadot.gov snapshot(.) • Text • #8205,OL074 • … • Text • I-74 Bridge • Text • Twin Bridge • Element • gml:Envelope Text The Interstate 74 Bridge … Attribute srsName=http://earth-info.nga.mil • Element • gml:lowerCorner • Element • gml:upperCorner Text 41.512674 -90.513161 Text 41.524113 -90.51299

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