add new fragments for different levels of data

src/api/fragments/NodeInitial.gql

@@ -0,0 +1,52 @@
+# This fragment queries some elementary data to define the content structure
+
+fragment NodeInitial on TextInterface {
+  id
+  type: bundle
+  variant: familles {
+    id
+  }
+
+  ... on Textprod {
+    parents: text_de_depart {
+      id
+      variant: familles {
+        id
+      }
+    }
+
+    siblings: text_en_rebond {
+      id
+      variant: familles {
+        id
+      }
+    }
+  }
+
+  ... on Textref {
+
+    siblings: text_en_rebond {
+      id
+      variant: familles {
+        id
+      }
+    }
+
+    authors: auteurs {
+      id
+      name
+      first_name
+      last_name
+    }
+
+    preTitle: field_titre_regular
+    title: field_titre_italique
+
+    children: text_produits {
+      id
+      variant: familles {
+        id
+      }
+    }
+  }
+}