This page provides practical examples for the Strata plugin.

The examples in this section are based on the following three pages existing:

:data:cities:madrid

====== Madrid ======
<data city>
----------
metro_area: Madrid metropolitan area
country: Spain
population: 3,141,991
mayor: Manuela Carmena
----------
</data>

:data:cities:london

====== London ======
<data city>
----------
metro_area: Greater London
country: UK
population: 8,673,713
----------
</data>

:data:cities:berlin

====== Berlin ======
<data city>
----------
metro_area: Berlin-Brandenburg Metropolitan Region
country: Germany
population: 3,670,622
----------
</data>

List all cities and their population in a table.

Columns:

1. Name. Hyperlink to page on which the city data is defined.
2. Population. Text field. Displays population.

<table>
fields {
    -- Each field becomes a column in the displayed table
    ?name: Name
    ?pop: Population
}
-- The result set will contain one row for each city data object found by the query 
-- The first column contains a link to the page on which that data object code is found
?name is a: city
?name Population: ?pop
</table>

Columns are defined inside fields:

1. ?name: Name assigns the caption Name to the ?name field. ?name is a: city defines ?name as a city data object. In this example, the city data objects exist on each city's page. Strata assigns a link to that page to ?name. Now, ?name can be used to link other fields to this result row.
2. ?pop:Population defines the id and description of the second column. ?name Population: ?pop tells Strata to populate the second column with the value of the Population field in the city data object.

Applying < operator doesn't seem to filter out London - why?

<table>
fields {
    ?name: Name
    ?pop: Population
}
?name is a: city
?name Population: ?pop
?pop < 500000
</table>

No functional effect. They are comments intended to make the data section stand out on a real-world page with lots of content.