I wrote a sample that retrieves thumbnail images and content URLs from the Japan Search utilization schema.

An example query is shown below.

PREFIX jps: <https://jpsearch.go.jp/term/property#>
PREFIX schema: <http://schema.org/>
PREFIX chname: <https://jpsearch.go.jp/entity/chname/>
SELECT ?cho ?image ?associatedMedia WHERE {
    ?cho schema:image ?image;
        jps:sourceInfo/schema:provider chname:水研機構図書資料デジタルアーカイブ .
    optional {
        ?cho jps:accessInfo/schema:associatedMedia ?associatedMedia .
    }
} limit 1000 offset 0

You can try it on Snorql from the URL below.

Open the query in Snorql

A Google Colab example is also available.

Open in Google Colab

I hope this is helpful for those working with the same data.