1. making ogc's wfs specification mash-up friendly
Raj Singh, Open Geospatial Consortium
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

2. Copyright 2006, Open Geospatial Consortium, Inc. (OGC)
OGC Today
320+ members worldwide – 31 countries & 5 continents
Over 100 European members
16 approved Implementation Specifications fielded in hundreds of products
20+ candidate Implementation Specifications in work
Significant interaction with ISO, W3C, IETF, OASIS and other standards organizations
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

3. what’s with the mashup excitement?
unfounded
“system integration” should be as sexy as “mashup”
but there must be some truth to it
simple things should be easy…
more complex things can be harder…
deployed in rich internet applications
AJAX
Flash
Laszlo
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

4. how OGC fits into the mix
WMS
pretty nice way of getting maps in a mashup
WFS
hasn’t had the same level of uptake
there’s a nice HTTP GET spec. buried in the document, and that got me thinking…
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

5. Copyright 2006, Open Geospatial Consortium, Inc. (OGC)
WFS Basic — a proposal
WFS Basic is a profile of Web Feature Service 1.1 intended to be easier to implement, particularly on non-geospatial platforms. The goal is to encourage mainstream Web systems, like standard PHP/MySQL setups, to participate in the geospatial Web. The primary constraints on WFS 1.1 are:
There is no HTTP POST encoding of a WFS Basic request
Only one Feature Type is allowed per service instance (therefore the TypeName parameter goes away)
There is no <Filter> parameter supported
Data may (optionally) be filtered using a regular expression
All properties (i.e. columns) are always returned in a GetFeature request
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

6. WFS Basic — basic data requests
&OUTPUTFORMAT=application/atom+xml
&OUTPUTFORMAT=text/xml
&BBOX=-71.00,42.00,-72.00,43.00&MINDATE= &MAXDATE= &OUTPUTFORMAT=text/xml
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

7. but we also support filters!
regular expression queries on attributes
we call them feature types
well, how do you know what the attributes are?
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

8. WFS Basic — DescribeFeatureType
Request:
Response:
<?xml version="1.0" encoding="UTF-8"?>
<schema
targetNamespace=" xmlns:myns="
xmlns:xsd=" xmlns="
xmlns:gml=" elementFormDefault="qualified" version="0.1">
<import namespace=" schemaLocation="../gml/3.1.1/base/gml.xsd"/>
<!-- === define global elements === -->
<element name="TreesA_1M" type="myns:TreesA_1M_Type" substitutionGroup="gml:_Feature"/>
<!-- === define complex types (classes) === -->
<complexType name="TreesA_1M_Type">
<complexContent>
<extension base="gml:AbstractFeatureType">
<sequence>
<element name="id" nillable="true" minOccurs="0" type="int"/>
<element name="treeType" nillable="true" minOccurs="0" type="string"/>
<element name="lon" type="float" nillable="false"/>
<element name="lat" type="float" nillable="false"/>
</sequence>
</extension>
</complexContent>
</complexType>
</schema>
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

9. Copyright 2006, Open Geospatial Consortium, Inc. (OGC)
Discussion topics
Uses for WFS Basic
advanced use of RSS feeds
simple geo-query of any database with lat/lon fields
is it onerous to use XML Schema to describe the data?
is regex the “right” choice for filtering content?
should we keep the WFS requirement for GML output?
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)

10. join the discussion at: http://www.ogcnetwork.net/wfsbasic
Thank you
Raj R. Singh
join the discussion at:
Copyright 2006, Open Geospatial Consortium, Inc. (OGC)