Add doc examples for feature query

hugo/content/examples/ex_query_data.md

@@ -14,12 +14,60 @@ see the [Usage](/usage/) section.
 
 ## Basic Query
 
+The most basic query against a feature collection is to
+retrieve an unfiltered list of the features in a collection.
+The number of features returned is limited by the service
+configuration for the default feature limit.
 
+The following query returns a partial list of
+the countries in the `ne.countries` collection, as a GeoJSON FeatureCollection:
+```
+http://localhost:9000/collections/ne.countries/items.json
+```
 
-## Query using a Bounding Box Filter
+The query can also be returned as a map view in the web UI:
+```
+http://localhost:9000/collections/ne.countries/items.html
+```
+which should display a page like this:
 
-## Query specifying Properties
+![Map view of basic query](/ex-query-data-countries-basic.png)
 
-## Query using Limit and Offset
+## Query using a Bounding Box Filter and Limit
+
+The extent and number of features returned can be controlled
+by the `bbox` and `limit` query parameters.
+To query the countries in the Caribbean and ensure that all of
+them are returned this query could be used:
+```
+http://localhost:9000/collections/ne.countries/items.html
+?bbox=-93.0688,9.3746,-54.0296,25.9053&limit=100
+```
+![Map view of query with bbox and limit](/ex-query-data-countries-bbox-limit.png)
+
+## Query with a Property filter and Properties list
+
+Another way to limit the features returned is via a property filter query parameter.
+For instance, the countries in Europe can be returned via using the query parameter `continent=Europe`.
+To make it easy to verify the result, the returned properties have been
+restricted using the `properties` query parameter.
+And as before a higher `limit` value is used to ensure all features are returned.
+```
+http://localhost:9000/collections/ne.countries/items.html
+?continent=Europe&properties=gid,name,continent&limit=100
+```
+![Map view of query with property filter](/ex-query-data-countries-prop-filter.png)
 
 ## Query a Feature by ID
+
+A single feature can queried by providing the feature ID
+as part of the resource path.
+Fitering parameters do not apply to feature queries,
+but the response properties can be specified
+using `properties`.
+
+```
+http://localhost:9001/collections/ne.countries/items/55.html
+?properties=gid,name,continent
+```
+![Map view of query for feature by ID](/ex-query-data-countries-feature.png)

hugo/content/usage/query_data.md

@@ -124,7 +124,6 @@ The response is a GeoJSON feature containing the result.
 http://localhost:9000/collections/ne.countries/items/23
 ```
 
-
 ### Restrict properties
 
 The query parameter `properties=PROP1,PROP2,PROP3...`