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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: More on taming SAX (was Re: ANN: Amara XMLToolki
 Alan Gutierrez wrote: >* Jeff Rafter <lists@j...> [2004-12-23 13:43]: > > >>>While on the topic of SAX taming features in Amara, there is also >>>amara.saxtools.xpattern_sax_state_machine, which I didn't even bother >>>mentioning in the announcement (too much to cram in). >>> >>> >>Can you expand on your expansion? As I was reading this I was thinking >>that in the Java/C# world an interesting approach would be to keep a >>pseudo DOM stack for the event hierarchy. Maybe something where you keep >>everything at an ancestral level intact while parsing >> >> >><foo> >> <bar1> >> <baz1/> >> <baz2/> >> </bar1> >> <bar2> >> <baz1> >> <sub/> >> </baz1> >> <baz2>text</baz2> >> </bar2> >></foo> >> >>So when the event stream reached /foo/bar2/baz2/text() you would have >>the following in a DOM like structure: >> >> foo >> \ >> bar1 (... no children) >> bar2 >> \ >> baz1 (... no children, just the previous sibling and attrs) >> baz2 (only the StartTag) >> >>I am not sure that the preceding siblings would be very useful and have >>more chances for pathological cases but when I construct mini-trees this >>is the subset I find handy. It is useful when working with an editor to >>understand the immediate context. Unfortunately by requiring the >>previous siblings you have to maintain quite a bit more... the whole >>preceding branch of the tree. >> >> > > I have a SAX library (in Java) that keeps the stack around, but > not the preceeding siblings. It is quite useful. > > It is, actually, very useful to keep a stack around that has a > hash table for each level of the stack, it allows for the > devleopment of strategies that are themselves stateless. > > Adding the implied stack goes a long way to make SAX event > processing a more practical solution for a lot of problems. > > Yes. This is a useful technique I covered for Python in my article "Location, Location, Location <http://www.xml.com/pub/a/2004/11/24/py-xml.html>": http://www.xml.com/pub/a/2004/11/24/py-xml.html I think that while useful this technique can still leave a lot of state wrangling to the programmer, which is why Amara has several modules that go further. -- Uche Ogbuji Fourthought, Inc. http://uche.ogbuji.net http://4Suite.org http://fourthought.com Use CSS to display XML - http://www.ibm.com/developerworks/edu/x-dw-x-xmlcss-i.html Full XML Indexes with Gnosis - http://www.xml.com/pub/a/2004/12/08/py-xml.html Be humble, not imperial (in design) - http://www.adtmag.com/article.asp?id=10286 UBL 1.0 - http://www-106.ibm.com/developerworks/xml/library/x-think28.html Use Universal Feed Parser to tame RSS - http://www.ibm.com/developerworks/xml/library/x-tipufp.html Default and error handling in XSLT lookup tables - http://www.ibm.com/developerworks/xml/library/x-tiplook.html A survey of XML standards - http://www-106.ibm.com/developerworks/xml/library/x-stand4/ The State of Python-XML in 2004 - http://www.xml.com/pub/a/2004/10/13/py-xml.html 
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