change of namespace in SAS annotations

[pbinkley]

Original resource section of an annotation created by Annotate:

  "resource": [
      {
        "@type": "dctypes:Text",
        "format": "text/html",
        "chars": "<p>5</p>"
      }
    ],

Annotation stored in SAS:

 "resource" : [ {
    "@id" : "_:b0",
    "@type" : "dctypes:Text",
    "http://dev.llgc.org.uk/sas/full_text" : "coat of arms",
    "format" : "text/html",
    "chars" : "<p>coat of arms</p>"
  } ],