Cart
[Home] [By Thread] [By Date] [Recent Entries]
We have proposed a delta format for XML (see http://www.deltaxml.com) which does what you need though it does not use Xpath. The delta file is similar to the input files in structure rather than being a flat list of Xpath style statements, and this works well for nested data. Take a look at it - the code is there for download and can be used for free on small files, and it will re-combine the delta with either original to create the other file. Robin At 11:48 AM -0400 4/18/01, Joel Bender wrote: >I have a collection of applications that share an XML file. When one >application changes some piece of the file, i.e., an attribute value >changes or an element is added/replaced/deleted, a notification of >the change will be sent to the other peers. Sending a new copy of >the entire file will not satisfy my performance requirements. > >I've been poking around in the XML Fragment Interchange working draft >[1], but it seems pretty verbose for deeply nested elements. It also >references XPointer, but the fragment package definition makes my >eyes gloss over and for some reason the text gets blurry :-). I >guess I was expecting something that used XPath. > >If there was a tool that explained the differences between two XML >files as a series of delta expressions, that would be a great start. >For example: > > <addAttr path="a/b@c">value</addAttr> > <deleteAttr path="a/b@d"/> > <addElement path="a/b"><c>Some content</c></addElement> > >Once these tiny delta elements are defined, they'll be useful in all >kinds of ways. I could save them as an audit log stored in an XML >database, buffer a sequence of them up for applications that have >been out of touch for a while, keep a stack of them for undo >operations. > >Hints? Tips? Tricks? > > >Joel > >1. http://www.w3.org/TR/1999/WD-xml-fragment-19990303.html > >------------------------------------------------------------------ >The xml-dev list is sponsored by XML.org, an initiative of OASIS ><http://www.oasis-open.org> > >The list archives are at http://lists.xml.org/archives/xml-dev/ > >To unsubscribe from this elist send a message with the single word >"unsubscribe" in the body to: xml-dev-request@l... -- ----------------------------------------------------------------- Robin La Fontaine, Monsell EDM Ltd (XML file comparison, Engineering data exchange and management using XML) Tel: +44 1684 592 144 Fax: +44 1684 594 504 Email: robin@m... http://www.deltaxml.com
|
