Creating a Planet Me Blog Aggregator

Listing 13. Use Jena to query your Planet Me site.

$ cat rss-by-date.sparql
PREFIX dc:   <http://purl.org/dc/elements/1.1/>
PREFIX xsd:  <http://www.w3.org/2001/XMLSchema#>

DESCRIBE ?channel ?bnode ?a WHERE
{
 ?channel ?items ?bnode .
 ?bnode ?hasitem ?a .
 ?a dc:date ?date .
 FILTER ( xsd:dateTime(?date)
    >= xsd:dateTime("2006-01-03T00:00:00")
 && xsd:dateTime(?date)
    <= xsd:dateTime("2006-01-05T00:00:00") )
}

$ cd ~/planet/me
$ java jena.sparql --data archive.xml \
 --query rss-by-date.sparql --results RDF/XML \
 >my-query-result.rss

Listing 14. Use Jena query results to modify your Planet Me aggregation.

$ cd ~/planet/me-meta
$ cp -av config.ini.template config.ini
$ echo \
"[file:///home/ben/planet/me/my-query-result.rss]" \
  >>config.ini
$ echo "name = archive" >>config.ini
$ cd ~/planet
$ rm -f cache/file.home*
$ python planet.py me-meta/config.ini

Listing 15. You can use regular expressions as filters.

PREFIX dc:   <http://purl.org/dc/elements/1.1/>
PREFIX xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX rss:  <http://purl.org/rss/1.0/>
PREFIX content: <http://purl.org/rss/1.0/modules/content/>

DESCRIBE ?channel ?bnode ?a WHERE
{
 ?channel ?items ?bnode .
 ?bnode ?hasitem ?a .
 ?a content:encoded ?content .
 FILTER ( regex(?content, ".*product.*", "i") )
}