// Access a triple from the default graph
var creator = stratified['@graph']['https://example.org/graph/0']['https://purl.org/dc/elements/1.1/creator'];
// "Jane Doe"
// Access a triple in a named graph
var type = stratified['https://example.org/graph/0']['https://example.org/library']['@type'];
// "https://example.org/vocab#Library"
// Before submitting a document, mutate a property
stratified['https://example.org/graph/0']['https://example.org/library/the-republic']['@type'] = 'https://example.org/vocab#Book';
// Or using an immutable spread syntax approach
var new_doc = { 
  ...stratified, 
  'https://example.org/graph/0': {
    ...stratified['https://example.org/graph/0'],
    'https://example.org/library/the-republic' : {
      ...stratified['https://example.org/graph/0']['https://example.org/library/the-republic'],
      '@type': 'https://example.org/vocab#Book'
    }
  }
}