Re: [Vtd-xml-users] GeoXPath subproject

[Jimmy Z. <cra...@co...>]

Here is the project summary for GeoXPATH
GeoXPath module focuses on extending XPath implementation to support =
geospatial operations, it implements an geo-enabled XPath syntax by =
appending some geospatial operators to the core function library of =
XPath. One can use it to do geospatial query on GML.=20

The implementation and the definitions of augmented operators will refer =
to relative OGC specifications involving GML and SFS, and these =
operators fall into the following three categories:=20

  a.. Basic geospatial operators, such as dimension, geometrytype, srid, =
envelope, astext, asbinary;=20

  b.. Geospatial relationship predicates, such as equals, disjoint, =
intersects, touches, crosses, within, contains, overlap;=20

  c.. Geospatial analysis operators, such as distance, buffer, =
convexhull, intersection, union, difference, symdifference.

  ----- Original Message -----=20
  From: jie yan=20
  To: vtd...@li...=20
  Sent: Monday, June 11, 2007 8:40 PM
  Subject: [Vtd-xml-users] GeoXPath subproject


  Hi All,
  The GeoXPath sub-project has been declared on VTD-XML website.
  I'm just making first-phase preparations, to get familiar with JFlex =
and CUP, to understand existing XPath implementation of VTD-XML, to read =
GML and SFA specifications, to design the definitions of geo-related =
functions, for instance.=20
  Now it's time to start design and development, and I will appreciate =
all your suggestions and comments.

  Leon




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