hi,
1. ) Streaming Xpath Parser is developed for a ESB which get AXIOM Object
and traverse through it and get results.here the main concern is to improve
the performance of xpath parsing by specifying specific rules relevant to
the domain. (e.g if there is expression such as “/data/book” it only give
the first child element under the data element ) what i suggest is
creating a XpathEngine which does not consume any external object model and
it will operate on top of the XML Stream that means traverse xmlstream and
evaluate xpath.
2.) I have read some background documents and tutorials about Operation and
design of PsychoPathXpathProcessor basically it Operates as follows
1. Load the XML Document
currently XMLDocument is load using DOM Package ,Xerces and it can be
replaced with other packages by implementing wrapper and it should be
implemented in a way that inner functionality should not break.
2. Initialize static and dynamic context in respect to the
document root.
this is done by internal packages.
3. Parse the XPath 2.0 expression.
this is done by external packages JFlex and CUP
4. Statically verify the XPath 2.0 expression.
5. Evaluate the XPath 2.0 expression in respect to the XML
document.
both 4 and 5 are done internally.
If internal functionality is tightly coupled with DOM is it possible to
integrate with DOOM component .
On Sat, Mar 23, 2013 at 9:09 PM, Andreas Veithen
<[email protected]>wrote:
> I think that 1 and 2 only make sense as a single project (as described
> in AXIOM-367):
>
> * The scope of 2 is not large enough for a GSoC project.
> * 2 is a prerequisite for 1, but 1 is also an important test to check
> that the design of the new API is correct.
>
> Regarding 3, can you give a definition of "streaming XPath parser"?
>
> Andreas
>
> On Sat, Mar 23, 2013 at 3:47 AM, Isuru Ranawaka <[email protected]>
> wrote:
> > hi all ,
> >
> > I am a final year student from computer science and engineering
> department
> > of university of moratuwa. I would like to do a GSOC project .Some of
> the
> > prefered project ideas are as follows
> >
> >
> > 1. Improve AXIOMXpath for support for Xpath 2.0
> >
> > currently AXIOM is only support for Xpath 1.0 which is used in jaxen
> > 1.1 .So upgrading Xpath 1.0 to Xpath 2.0 can be done by integrating Xpath
> > Processor such as psychoPath xpath 2.0 processor. basically it has
> loosely
> > coupled API with internal implementation and it has more than 80
> production
> > rules.Xpath parsing is done via JFlex and CUP.
> >
> >
> > 2. Develop Abstract API for make AXIOM loosely couple with Xpath
> > Implementation.
> >
> > currently AXIOM is tightly coupled with jaxen 1.1 and it will hard
> to
> > replace with new Xpath implementations.So developing Abstract API with
> > reusing javax.xml.xpath which is independent from object model is
> another
> > idea.
> >
> >
> > 3. Implement Streaming Xpath Engine on top of the XMLStream.
> >
> > Available Streaming Xpath Parsers are implement on top of the AXIOM
> .So
> > this idea is to implement it on top of the XMLStream which can gain
> > performance than others.Here a Xpath Expression Compiler should be
> > implemented and have to figure out object model for evaluate XML Stream.
> >
> >
> >
> > I would like to work on a project above mentioned and
> please
> > send your thoughts and ideas .
> >
> >
> >
> > thanks
> >
> > isuru
> >
> >
>
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