[DRAFT] mapDataToProps

So, this isn't how the current mapDataToProps interface works, but an effort to design a less flexible but more powerful and consistent interface.

const collectionMembers = [NS.as('pages'), NS.as('items'), NS.rdfs('member')];

const Component = ({
  somePropName,
  customProp,
  someNestedContainer,
  someDeeplyNestedProperty,
  deeplyNestedWhereMatches,
}) => {
  console.log(somePropName);                 // 'name value'
  console.log(customProp);                   // [Statement(NamedNode(s), p, o, g), ...]
  console.log(someNestedContainer);          // [NamedNode('seq 1'), NamedNode('seq 2')]
  console.log(someDeeplyNestedProperty);     // [NamedNode('closed member'), NamedNode('open member'), ...]
  console.log(deeplyNestedWhereMatches);     // [NamedNode('open member'), ...]
}

Component.mapDataToProps = {
  name: string(NS.schema.name),
  // The raw interface the other helper functions boil down to
  customProp: {
    transform: (i) => i,
    label: NS.ex('prop'),
    limit: Infinity,
    returnType: 'statement'
  },
  // arr can resolve native rdf container types (rdf:Bag/Seq, rdf:List)
  someNestedContainer: arr({
    label: NS.ex('somePropWithRDFSRangeRDFContainer')
  }),
  someDeeplyNestedProperty: dig(collectionMembers),
  deeplyNestedWhereMatches: findSubject(collectionMembers, NS.ex('state/open')),
}