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..

*****************************************************************************
 MapServer Filter Encoding (FE) HOWTO - Version 4.6
*****************************************************************************

:Author: Jeff McKenna
:Contact: jmckenna@dmsolutions.ca
:Author: Yewondwossen Assefa
:Contact: assefa@dmsolutions.ca
:Revision: $Revision$
:Last Updated: $Date$

..  The next heading encountered becomes our H2
..

.. sectnum::

.. contents:: Table of Contents
    :depth: 2
    :backlinks: top


Introduction
============

This document describes the procedures for taking advantage of the Filter 
Encoding (FE) support in WFS GetFeature requests, which was added to 
MapServer in version 4.2.  

This document assumes that you are already familiar with the following 
aspects of MapServer:

- MapServer application development and setting up .map files.

- Familiarity with the WFS specification would be an asset. Links to the 
  MapServer WFS documents are included in the next section. 

Links to SLD-related Information
--------------------------------

- `Filter Encoding Implementation Specification`_.
- `MapServer WFS Client HOWTO`_.
- `MapServer WFS Server HOWTO`_.
- `Open GIS Consortium (OGC) home page`_.

.. _`Filter Encoding Implementation Specification`: http://www.opengeospatial.org/docs/02-059.pdf
.. _`MapServer WFS Client HOWTO`: http://ms.gis.umn.edu/docs/howto/wfs_client
.. _`MapServer WFS Server HOWTO`: http://ms.gis.umn.edu/docs/howto/wfs_server
.. _`Open GIS Consortium (OGC) home page`: http://www.opengeospatial.org

Currently Supported Features
============================

The following table lists the currently supported features for FE.

**Table 1. Currently Supported Features**

+----------------------+-------------------------------------+
| Feature Set          | Feature                             |
+======================+=====================================+
| Spatial Capabilities |                                     |
+----------------------+-------------------------------------+
|                      | BBox                                |
|                      +-------------------------------------+   
|                      | Intersects                          |
|                      +-------------------------------------+     
|                      | DWithin                             |
+----------------------+-------------------------------------+
| Scalar Capabilities  |                                     |
+----------------------+-------------------------------------+
|                      |                                     |
+----------------------+-------------------------------------+
| Logical Operators    |                                     |
+----------------------+-------------------------------------+
|                      | And                                 |
|                      +-------------------------------------+   
|                      | Or                                  |
|                      +-------------------------------------+     
|                      | Not                                 |
+----------------------+-------------------------------------+
| Comparison Operators |                                     |
+----------------------+-------------------------------------+
|                      | PropertyIsNotEqualTo (<>)           |
|                      +-------------------------------------+   
|                      | PropertyIsLessThan (<)              |
|                      +-------------------------------------+     
|                      | PropertyIsGreaterThan (>)           |
|                      +-------------------------------------+   
|                      | PropertyIsLessThanOrEqualTo (<=)    |
|                      +-------------------------------------+     
|                      | PropertyIsGreaterThanOrEqualTo (>=) |
|                      +-------------------------------------+     
|                      | PropertyIsLike                      |
|                      +-------------------------------------+     
|                      | PropertyIsBetween (range)           |
+----------------------+-------------------------------------+

Get and Post Requests
=====================

MapServer already has the capability to receive and parse Get requests and 
URL-encoded Post requests. The ability for MapServer to be able to receive 
Post requests with XML-encoded information sent in the body of the request 
has been added. Also, the ability to generate XML-encoded Post requests for 
WFS layers has been added.

Both Get and Post request are now supported for all WFS requests:

- GetCapabilities
 
- GetFeatures

- DescribeFeatureType 

Supporting these WFS requests in Post was implemented to keep consistency 
between all supported WFS requests.

When sending requests, the default request method used is Post. To change this 
behavior, we have introduced a layer level meta data, wfs_request_method, 
which can be set to "GET". 

Use of Filter Encoding in MapServer
===================================

This section describes how to use FE on both the server and client sides. 

Server Side
-----------

To be able to use Filter Encoding, you need to create a valid WFS server using 
MapServer. Please refer to the `WFS Server HOWTO`_ for specifics. 

.. _`WFS Server HOWTO`: http://ms.gis.umn.edu/docs/howto/wfs_server

There is nothing special that should be added to a WFS server for Filter 
Encoding, but you should note that, when requesting the capabilities of 
your WFS server, the document returned should contain the supported filters. 
Here is part of a Capabilities document as well as the Post support:

::

    <?xml version='1.0' encoding="ISO-8859-1" ?>
    <WFS_Capabilities 
       version="1.0.0" 
       updateSequence="0" 
       xmlns="http://www.opengis.net/wfs" 
       xmlns:ogc="http://www.opengis.net/ogc" 
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.opengis.net/wfs http://ogc.dmsolutions.ca/wfs/1.0.0/WFS-capabilities.xsd">

    <!-- MapServer version 4.1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP 
    OUTPUT=PDF OUTPUT=SWF SUPPORTS=PROJ SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER 
    SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT INPUT=POSTGIS 
    INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE -->

    <Service>
      <Name>MapServer WFS</Name>
      <Title>GMap WMS Demo Server</Title>
      <OnlineResource>http://localhost/cgi-bin/mapserv.exe?map=
        c:/msapps/wfs_filter/htdocs/ns_wfsserver.map&</OnlineResource>
    </Service>

    <Capability>
      <Request>
        <GetCapabilities>
          <DCPType>
            <HTTP>
              <Get onlineResource="http://localhost/cgi-bin/mapserv.exe?map=
                c:/msapps/wfs_filter/htdocs/ns_wfsserver.map&" />
            </HTTP>
          </DCPType>
          <DCPType>
            <HTTP>
              <Post onlineResource="http://localhost/cgi-bin/mapserv.exe?map=
                c:/msapps/wfs_filter/htdocs/ns_wfsserver.map&" />
            </HTTP>
          </DCPType>
        </GetCapabilities>
        ...
      </Request>
    </Capability>
    ...
    <Filter_Capabilities>
      <Spatial_Capabilities>
        <Spatial_Operators>
                 <Intersect/>
                 <DWithin/>
               <BBOX/>
        </Spatial_Operators>
      </Spatial_Capabilities>
      <Scalar_Capabilities>
        <Logical_Operators />
        <Comparison_Operators>
          <Simple_Comparisons />
          <Like />
          <Between />
        </Comparison_Operators>
      </Scalar_Capabilities>
    </Filter_Capabilities>

    </WFS_Capabilities>
    
Client Side
-----------

To be able to generate a Filter to a WFS server, a layer level metadata called 
*wfs_filter* has been added, which should contain the filter to be sent to the 
server. Following is an example of a valid WFS client layer with a filter:

::

    LAYER
      NAME popplace
      METADATA
        "wfs_version"   "1.0.0"       
        "wfs_typename"  "popplace"
        "wfs_filter"    "<PropertyIsGreaterThan><PropertyName>POP_RANGE</PropertyName>
                                         <Literal>4</Literal></PropertyIsGreaterThan>"        
      END
      TYPE POINT
      STATUS ON
      PROJECTION
        "init=epsg:42304"
      END
      CONNECTIONTYPE WFS
      CONNECTION "http://www2.dmsolutions.ca:8090/cgi-bin/mswfs_filter?"
      LabelItem "Name"  
      CLASSITEM "Capital" 
      CLASS
        SYMBOL 2
        SIZE 8
        NAME "Cities"
        LABEL
          COLOR  255 0 0
          FONT fritqat-italic
          TYPE truetype
          SIZE 8
          POSITION AUTO         
          OUTLINECOLOR 255 255 255  
          FORCE TRUE
        END 
        COLOR 0 0 0
      END
    END # Layer

*Note:*

- The filter given as a value of the wfs_filter metadata should not contain 
  <Filter> start and end tags.

- The CONNECTION points to a valid WFS server supporting filters

- The returned shapes will be drawn using the class defined in the layer.

Limitations
===========

- A limited set of spatial operators are supported. 


Tests
=====

Here are some test URLs for the different supported filters:

- `PropertyIsEqualTo`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsEqualTo><PropertyName>NAME</PropertyName>
  <Literal>Digby</Literal></PropertyIsEqualTo></Filter> 
  
- `PropertyIsNotEqualTo`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsNotEqualTo><PropertyName>NAME</PropertyName>
  <Literal>Digby</Literal></PropertyIsNotEqualTo></Filter>

- `PropertyIsLessThan`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsLessThan><PropertyName>POP_RANGE</PropertyName>
  <Literal>2</Literal></PropertyIsLessThan></Filter>

- `PropertyIsGreaterThan`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsGreaterThan><PropertyName>POP_RANGE</PropertyName>
  <Literal>5</Literal></PropertyIsGreaterThan></Filter>

- `PropertyIsLessThanOrEqualTo`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsLessThanOrEqualTo><PropertyName>POP_RANGE</PropertyName>
  <Literal>2</Literal></PropertyIsLessThanOrEqualTo></Filter>

- `PropertyIsGreaterThanOrEqualTo`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsGreaterThanOrEqualTo><PropertyName>POP_RANGE</PropertyName>
  <Literal>5</Literal></PropertyIsGreaterThanOrEqualTo></Filter>

- `PropertyIsBetween`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsBetween><PropertyName>POP_RANGE</PropertyName>
  <LowerBoundary>5</LowerBoundary><UpperBoundary>6</UpperBoundary></PropertyIsBetween></Filter>

- `PropertyIsLike`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><PropertyIsLike wildcard='*' singleChar='.' escape='!'>
  <PropertyName>NAME</PropertyName><Literal>Syd*</Literal></PropertyIsLike></Filter>

- `Logical operator OR`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><OR><PropertyIsEqualTo><PropertyName>NAME</PropertyName>
  <Literal>Sydney</Literal></PropertyIsEqualTo><PropertyIsEqualTo><PropertyName>NAME</PropertyName>
  <Literal>Digby</Literal></PropertyIsEqualTo></OR></Filter>

- `Logical operator AND`_ 

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><AND><PropertyIsLike wildcard='*' singleChar='.' escape='!'>
  <PropertyName>NAME</PropertyName><Literal>Syd*</Literal></PropertyIsLike><PropertyIsEqualTo>
  <PropertyName>POP_RANGE</PropertyName><Literal>4</Literal></PropertyIsEqualTo></AND></Filter>

- `Logical operator NOT`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&
  TYPENAME=popplace&Filter=<Filter><AND><NOT><PropertyIsEqualTo><PropertyName>POP_RANGE</PropertyName>
  <Literal>2</Literal></PropertyIsEqualTo></NOT><NOT><PropertyIsEqualTo><PropertyName>POP_RANGE</PropertyName>
  <Literal>3</Literal></PropertyIsEqualTo></NOT></AND></Filter> 

- `Spatial operator BBOX`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&
  Filter=<Filter><BBOX><PropertyName>Name>NAME</PropertyName><Box%20srsName='EPSG:42304'>
  <coordinates>2518000,150000 2918000,450000</coordinates></Box></BBOX></Filter>

- `Spatial operator Dwithin`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=
  <Filter><DWithin><PropertyName>Geometry</PropertyName><gml:Point><gml:coordinates>2587598.000000,404010.531250</gml:coordinates>
  </gml:Point><Distance units='m'>1000</Distance></DWithin></Filter>

- `Spatial operator Intersects`_

::

  http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter>
  <Intersect><PropertyName>Geometry</PropertyName><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing>
  <gml:coordinates>2488789,289552 2588789,289552 2588789,389552 2488789,389552 2488789,289552</gml:coordinates>
  </gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></Intersect></Filter>

.. _`PropertyIsEqualTo`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsEqualTo><PropertyName>NAME</PropertyName><Literal>Digby</Literal></PropertyIsEqualTo></Filter>
.. _`PropertyIsNotEqualTo`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsNotEqualTo><PropertyName>NAME</PropertyName><Literal>Digby</Literal></PropertyIsNotEqualTo></Filter>
.. _`PropertyIsLessThan`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsLessThan><PropertyName>POP_RANGE</PropertyName><Literal>2</Literal></PropertyIsLessThan></Filter>
.. _`PropertyIsGreaterThan`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsGreaterThan><PropertyName>POP_RANGE</PropertyName><Literal>5</Literal></PropertyIsGreaterThan></Filter>
.. _`PropertyIsLessThanOrEqualTo`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsLessThanOrEqualTo><PropertyName>POP_RANGE</PropertyName><Literal>2</Literal></PropertyIsLessThanOrEqualTo></Filter>
.. _`PropertyIsGreaterThanOrEqualTo`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsGreaterThanOrEqualTo><PropertyName>POP_RANGE</PropertyName><Literal>5</Literal></PropertyIsGreaterThanOrEqualTo></Filter>
.. _`PropertyIsBetween`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsBetween><PropertyName>POP_RANGE</PropertyName><LowerBoundary>5</LowerBoundary><UpperBoundary>6</UpperBoundary></PropertyIsBetween></Filter>
.. _`PropertyIsLike`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><PropertyIsLike%20wildcard='*'%20singleChar='.'%20escape='!'><PropertyName>NAME</PropertyName><Literal>Syd*</Literal></PropertyIsLike></Filter>
.. _`Logical operator OR`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><OR><PropertyIsEqualTo><PropertyName>NAME</PropertyName><Literal>Sydney</Literal></PropertyIsEqualTo><PropertyIsEqualTo><PropertyName>NAME</PropertyName><Literal>Digby</Literal></PropertyIsEqualTo></OR></Filter>
.. _`Logical operator AND`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><AND><PropertyIsLike%20wildcard='*'%20singleChar='.'%20escape='!'><PropertyName>NAME</PropertyName><Literal>Syd*</Literal></PropertyIsLike><PropertyIsEqualTo><PropertyName>POP_RANGE</PropertyName><Literal>4</Literal></PropertyIsEqualTo></AND></Filter>
.. _`Logical operator NOT`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><AND><NOT><PropertyIsEqualTo><PropertyName>POP_RANGE</PropertyName><Literal>2</Literal></PropertyIsEqualTo></NOT><NOT><PropertyIsEqualTo><PropertyName>POP_RANGE</PropertyName><Literal>3</Literal></PropertyIsEqualTo></NOT></AND></Filter> 
.. _`Spatial operator BBOX`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><BBOX><PropertyName>Name>NAME</PropertyName><Box%20srsName='EPSG:42304'><coordinates>2518000,150000%202918000,450000</coordinates></Box></BBOX></Filter>
.. _`Spatial operator Dwithin`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><DWithin><PropertyName>Geometry</PropertyName><gml:Point><gml:coordinates>2587598.000000,404010.531250</gml:coordinates></gml:Point><Distance%20units='m'>1000</Distance></DWithin></Filter>
.. _`Spatial operator Intersects`: http://www2.dmsolutions.ca/cgi-bin/mswfs_filter?&VERSION=1.0.0&SERVICE=WFS&REQUEST=GetFeature&TYPENAME=popplace&Filter=<Filter><Intersect><PropertyName>Geometry</PropertyName><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>2488789,289552%202588789,289552%202588789,389552%202488789,389552%202488789,289552</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></Intersect></Filter>
   
- Tests using MapServer as a WFS client and a WFS server are available at http://www2.dmsolutions.ca/msapps/wfs_fe/.

- The OGC conformance tests (http://cite.occamlab.com/tsOGC/) have been run on 
  the FE support. The following table and notes reflect the current status.

**Table 2. WFS OGC test suite (over the HTTP Get and Post method)**

======== ========================================================= ========== =================
Test #   Description                                               # of Tests # of Failed Tests
======== ========================================================= ========== =================
1        Basic WFS tests over the HTTP Get and Post method         402        281
1.1      GetCapabilities                                           16         0
1.2      DescribeFeatureType                                       18         0
1.3      GetFeature                                                368        281
1.3.1    Basic WFS tests                                           20         1
1.3.2    Complex WFS tests                                         18         18
1.3.3    Arithmetic filter WFS tests                               8          8
1.3.4    Comparison WFS tests                                      50         26
1.3.4.1  GetFeature PropertyIsGreaterThanOrEqualTo filter          2          0
1.3.4.2  GetFeature PropertyIsBetween filter                       6          2
1.3.4.3  GetFeature PropertyIsEqualTo filter                       4          0
1.3.4.4  GetFeature PropertyIsGreaterThan filter                   4          2
1.3.4.5  GetFeature PropertyIsGreaterThanOrEqualTo filter          6          6
1.3.4.6  GetFeature PropertyIsLessThan filter                      6          4
1.3.4.7  GetFeature PropertyIsLessThanOrEqualTo filter             6          4
1.3.4.8  GetFeature PropertyIsLike filter                          2          0
1.3.4.9  GetFeature PropertyIsNotEqualTo filter                    6          0
1.3.4.10 GetFeature PropertyIsNull filter                          8          8
1.3.5    Logical WFS test                                          20         0
1.3.5.1  GetFeature AND PropertyIsEqualTo PropertyIsEqualTo filter 8          0
1.3.5.2  GetFeature OR PropertyIsEqualTo PropertyIsEqualTo filter  8          0
1.3.5.3  GetFeature NOT PropertyIsNotEqualTo filter                4          0
1.3.6    Spatial operator WFS test                                 252        228
1.3.6.1  GetFeature BBOX filter                                    36         12
1.3.6.2  GetFeature with other filter types                        216        216
2        Transactional WFS test                                    69         69
======== ========================================================= ========== =================

The OGC Cite WFS test suite can be found on the `OGC Cite portal`_.

.. _`OGC Cite portal`: http://cite.occamlab.com/test_engine/wfs_1_0_0/wfs_1_0_0.html

Following are some MapServer specific notes on this test suite:

1.  *Test number 1.3.1*:

    - There is a contradiction between the wfs/1.0.0/basic/getfeature/post/3 assertion 
      and the XPath expected value of the test. The assertion says: "Test that a 
      GetFeature request with no output format defined returns a wfs:FeatureCollection 
      with GML data." and the expected XPath value for this request: 
      "boolean(/ogc:ServiceExceptionReport)" is supposed to be true. So, the assertion 
      means that when a WFS server receives a request which contains an undefined 
      output format or no output format at all, the WFS server must return a WFS 
      collection containing GML data. The XPath expected value means that when a 
      WFS server receives a request with an undefined output format or no output 
      format at all, the WFS server must return a service exception report.
   
2.  *Tests number 1.3.2 and 1.3.3*:

    - Not supported.
    
3.  *Tests number 1.3.4.2, 1.3.4.4 to 1.3.4.7 (see bug 461 on MapServer Web site)*:

    - The string comparison is not supported using >, <, >=, <=.

    - The date comparison is not supported.
   
4.  *Test number 1.3.4.10*:

    - This property is not supported in MapServer.
   
5.  *Test number 1.3.6.1 (see bug 461 on MapServer Web site)*:

    - The returned feature xml won't validate because the validation is done 
      against a specific xsd (geomatry.xsd).

    - The data conversion on multipoints and multilayers are not supported within gdal.
   
6.  *Test number 2*:

    - The transaction requests are not supported. 

About This Document
===================

Copyright Information
---------------------

Copyright (c) 2005, Yewondwossen Assefa, Jeff McKenna.
                
This documentation is covered by the same Open Source license as the MapServer 
software itself.  See MapServer's `License and Credits`__ page for the complete 
text.
            
__ http://mapserver.gis.umn.edu/license.html   

Disclaimer
----------

No liability for the contents of this document can be accepted.
Use the concepts, examples and other content at your own risk.
As this is a new edition of this document, there may be errors
and inaccuracies that may be damaging to your system.
Although this is highly unlikely, the author(s) do not take any 
responsibility for that:  proceed with caution.