benji

@@ SPARQLScript
BASE <http://sparqlbot.semsol.org/data/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>

# set the endpoint
ENDPOINT <endpoint.php>

# feed still fresh?
$current = ASK FROM <graph-updates> WHERE {
  <http://planetrdf.com/index.rdf> dc:date ?date .
  FILTER (?date > ${now-1h})
}

# refresh feed and update graph log
IF (!$current) {
  DELETE FROM <http://planetrdf.com/index.rdf>
  LOAD <http://planetrdf.com/index.rdf>
  INSERT INTO <graph-updates> { <http://planetrdf.com/index.rdf> dc:date "${now}" }
}

@@ Parsed Structure
Array
(
    [0] => Array
        (
            [type] => endpoint_decl
            [endpoint] => http://sparqlbot.semsol.org/data/endpoint.php
        )

    [1] => Array
        (
            [type] => assignment
            [var] => Array
                (
                    [value] => current
                    [type] => var
                )

            [sub_type] => query
            [query] => Array
                (
                    [base] => http://sparqlbot.semsol.org/data/
                    [vars] => Array
                        (
                            [0] => date
                        )

                    [prefixes] => Array
                        (
                            [rdf:] => http://www.w3.org/1999/02/22-rdf-syntax-ns#
                            [rdfs:] => http://www.w3.org/2000/01/rdf-schema#
                            [owl:] => http://www.w3.org/2002/07/owl#
                            [xsd:] => http://www.w3.org/2001/XMLSchema#
                            [dc:] => http://purl.org/dc/elements/1.1/
                        )

                    [placeholders] => Array
                        (
                            [0] => now-1h
                        )

                    [type] => query
                    [query_type] => ask
                    [query] => ASK FROM <graph-updates> WHERE {
  <http://planetrdf.com/index.rdf> dc:date ?date .
  FILTER (?date > ${now-1h})
}
                )

        )

    [2] => Array
        (
            [type] => ifblock
            [condition] => Array
                (
                    [value] => current
                    [type] => var
                    [operator] => !
                )

            [blocks] => Array
                (
                    [0] => Array
                        (
                            [base] => http://sparqlbot.semsol.org/data/
                            [vars] => Array
                                (
                                )

                            [prefixes] => Array
                                (
                                    [rdf:] => http://www.w3.org/1999/02/22-rdf-syntax-ns#
                                    [rdfs:] => http://www.w3.org/2000/01/rdf-schema#
                                    [owl:] => http://www.w3.org/2002/07/owl#
                                    [xsd:] => http://www.w3.org/2001/XMLSchema#
                                    [dc:] => http://purl.org/dc/elements/1.1/
                                )

                            [type] => query
                            [query_type] => delete
                            [query] => DELETE FROM <http://planetrdf.com/index.rdf>
                        )

                    [1] => Array
                        (
                            [base] => http://sparqlbot.semsol.org/data/
                            [vars] => Array
                                (
                                )

                            [prefixes] => Array
                                (
                                    [rdf:] => http://www.w3.org/1999/02/22-rdf-syntax-ns#
                                    [rdfs:] => http://www.w3.org/2000/01/rdf-schema#
                                    [owl:] => http://www.w3.org/2002/07/owl#
                                    [xsd:] => http://www.w3.org/2001/XMLSchema#
                                    [dc:] => http://purl.org/dc/elements/1.1/
                                )

                            [type] => query
                            [query_type] => load
                            [query] => LOAD <http://planetrdf.com/index.rdf>
                        )

                    [2] => Array
                        (
                            [base] => http://sparqlbot.semsol.org/data/
                            [vars] => Array
                                (
                                )

                            [prefixes] => Array
                                (
                                    [rdf:] => http://www.w3.org/1999/02/22-rdf-syntax-ns#
                                    [rdfs:] => http://www.w3.org/2000/01/rdf-schema#
                                    [owl:] => http://www.w3.org/2002/07/owl#
                                    [xsd:] => http://www.w3.org/2001/XMLSchema#
                                    [dc:] => http://purl.org/dc/elements/1.1/
                                )

                            [type] => query
                            [query_type] => insert
                            [query] => INSERT INTO <graph-updates> { <http://planetrdf.com/index.rdf> dc:date "${now}" }
                        )

                )

        )

)