Changes between Version 3 and Version 4 of RFC59-Draft

Timestamp:

Aug 6, 2010, 8:56:40 AM (14 years ago)

Author:

sdlime

Comment:

--

RFC59-Draft

@@ -7 +7 @@
 
 A principle motivation for this work is to support OGC filter expressions in a single pass in a driver-independent manner.
+
+All of the work detailed here is being prototyped in a sandbox, visit:
+
+  [http://svn.osgeo.org/mapserver/sandbox/sdlime/common-expressions/mapserver]
 
 == Existing Expression Parsing ==
@@ -67 +71 @@
 '''Extending the Yacc grammar to support spatial operators'''
 
-The mapserver.h definitions above allow for using shapeObj's within the Yacc grammar. There are two types of shape-related tokens: 1) a shape binding, that is, a reference to the geometry being evaluated and 2) shape literals, shapes described as WKT within the expression string. For example:
+The mapserver.h definitions above allow for using shapeObj's within the Yacc grammar (we also define a shapeObj as a new base token type within mapparser.y). There are two types of shape-related tokens: 1) a shape binding, that is, a reference to the geometry being evaluated and 2) shape literals, shapes described as WKT within the expression string. For example:
 
 {{{
@@ -77 +81 @@
 }}}
 
+We can use these tokens in the grammar to implement all of the MapServer supported (via GEOS) logical operators.
 
 == Backwards Compatibility Issues ==