Algae

generalized RDF statement queries

• describes a graph with variables in some node positions
• s-expression syntax

  query ::	"(ask '(" contstraints+ ") :collect '(" variable+ "))"
  contstraint ::	urlvar ' ' urlvar ' ' urlvarstr
  urlvar ::	URL | variable
  urlvarstr ::	URL | variable | string
  variable ::	'?' name
  string ::	'"' text '"'

  (ask '(
  (http://...#type ?annot http://...#Annotation)
  (http://...#Author ?annot "Joe")
  (http://...#Annotates ?annot ?doc)
):collect '(?doc))
• inspired by algernon - principal difference:
  • algae is not access-limited - algernon assumes triples are accessed by subject only