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Regular-path expressions

The context of an element can be expressed in a CSS- and DSD-like manner: 
  WHERE <part*> <name> $r </> <brand> Ford </> </> IN "www.a.b.c/parts.xml"
  CONSTRUCT <result> $r </>

However, arbitrary regular expressions are supported: 
  WHERE <part+.(subpart|component.piece)>$r</> IN "www.a.b.c/parts.xml"
  CONSTRUCT <result> $r</>