remove other changes

xgi/readwrite/xgi_data.py

@@ -6,7 +6,6 @@
 from ..convert import cut_to_order, from_hif_dict, from_hypergraph_dict
 from ..exception import XGIError
 from ..utils import request_json_from_url, request_json_from_url_cached
-from .hif import write_hif, write_hif_collection
 
 __all__ = ["load_xgi_data", "download_xgi_data"]
 
@@ -59,9 +58,9 @@ def load_xgi_data(
     if read:
         cfp = join(path, dataset + ".json")
         if exists(cfp):
-            from ..readwrite import read_hif
+            from ..readwrite import read_json
 
-            return read_hif(cfp, nodetype=nodetype, edgetype=edgetype)
+            return read_json(cfp, nodetype=nodetype, edgetype=edgetype)
         else:
             warn(
                 f"No local copy was found at {cfp}. The data is requested "
@@ -109,6 +108,8 @@ def download_xgi_data(dataset, path="", collection_name=""):
         The name of the collection of data (if any). If `dataset` is not
         a collection, this argument is unused.
     """
+    from ..readwrite import write_json
+
     index_url = "https://raw.githubusercontent.com/xgi-org/xgi-data/main/index.json"
     index_data = request_json_from_url(index_url)
 
@@ -124,10 +125,10 @@ def download_xgi_data(dataset, path="", collection_name=""):
         url, nodetype=None, edgetype=None, max_order=None, cache=True
     )
     if isinstance(H, dict):
-        write_hif_collection(H, path, collection_name=collection_name)
+        write_json(H, path, collection_name=collection_name)
     else:
         filename = join(path, key + ".json")
-        write_hif(H, filename)
+        write_json(H, filename)
 
 
 def _request_from_xgi_data(
@@ -166,8 +167,8 @@ def _request_from_xgi_data(
     if "incidences" in jsondata:
         H = from_hif_dict(H, nodetype=nodetype, edgetype=edgetype)
         return cut_to_order(H, order=max_order)
-    
-    if "type" in jsondata and jsondata["type"] != "collection":
+
+    if "type" in jsondata and jsondata["type"] == "collection":
         collection = {}
         for name, data in jsondata["datasets"].items():
             relpath = data["relative-path"]