[DublinCore] Put dc rdfmeta schema in separated file

src/dublincore/dcschema.ts

+import { rdfMeta, application } from "@logilab/libview";
+import { ONTOLOGY } from "../common/schema";
+
+/**
+ * The data for DublinCore Elements metadata
+ */
+export interface DublinCoreElement extends rdfMeta.Loadable {
+  title: string;
+  description: string;
+  creator: string;
+  date: string;
+}
+
+/**
+ * The metaclass for DublinCore Element
+ */
+const DCE_METACLASS = new rdfMeta.MetaClass();
+
+DCE_METACLASS.properties = [
+  new rdfMeta.MetaPropertyData(
+    "title",
+    "http://purl.org/dc/elements/1.1/title"
+  ),
+  new rdfMeta.MetaPropertyData(
+    "description",
+    "http://purl.org/dc/elements/1.1/description"
+  ),
+  new rdfMeta.MetaPropertyData(
+    "creator",
+    "http://purl.org/dc/elements/1.1/creator"
+  ),
+  new rdfMeta.MetaPropertyData("date", "http://purl.org/dc/elements/1.1/date")
+];
+
+/**
+ * Loads the data for the entity of interest
+ * @param renderer The current renderer
+ * @param context The current rendering context
+ * @param target The current RDF entity to be rendered
+ */
+export function loadDublinCoreElement(
+  renderer: application.ViewRenderer,
+  context: application.RenderingContext,
+  target: application.Resource
+): DublinCoreElement {
+  return rdfMeta.loadEntity(renderer, context, ONTOLOGY, DCE_METACLASS, target);
+}