# Sequence in order

PREFIX  rdfs:   <http://www.w3.org/2000/01/rdf-schema#>
PREFIX  rdf:    <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX  :       <http://example/>
PREFIX  xsd:    <http://www.w3.org/2001/XMLSchema#>
PREFIX  jfn:    <http://jena.hpl.hp.com/ARQ/function#>

SELECT ?p ?member  WHERE
  {
     :x5 :seq ?seq .
     ?seq ?p ?member .
     FILTER ( regex (str(?p), "#_\\d+$") )
  }
ORDER BY xsd:integer(
           jfn:substring(
             str(?p),
             jfn:strlen(str(rdf:)) + 1
         ))