More tests, filtering iterator, cleanup

src/DatasetManager.php

@@ -2,6 +2,8 @@
 
 namespace NoccyLabs\Dataset;
 
+use Iterator;
+
 /**
  * DatasetManager is the central class of noccylabs/dataset.
  * 
@@ -36,11 +38,11 @@ class DatasetManager
      * Directly return a reader for a specific dataset.
      * 
      * @param string $identifier The dataset identifier
-     * @return ReaderInterface A reader for the data
+     * @return Iterator A reader for the data
      * @throws InvalidDatasetException if the dataset can not be opened
      * @throws UnknownDatasetException if the dataset does not exist
      */
-    public function openDataset(string $identifier): ReaderInterface
+    public function openDataset(string $identifier): Iterator
     {
         return $this->getDataset($identifier)->open();
     }
@@ -157,6 +159,11 @@ class DatasetManager
         return null;
     }
 
+    /**
+     * Register a dataset
+     * 
+     * 
+     */
     public function registerDataset(Dataset $dataset)
     {
         $id = $dataset->getIdentifier();