diff --git a/.travis.yml b/.travis.yml
index c44797f..2e8d81b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: php
 php:
+  - "7.3"
   - "7.2"
   - "7.1"
   - "7.0"
diff --git a/src/AnyDataset.php b/src/AnyDataset.php
index 6aa2e01..502ded7 100644
--- a/src/AnyDataset.php
+++ b/src/AnyDataset.php
@@ -59,32 +59,46 @@ class AnyDataset
      * Path to anydataset file
      * @var string
      */
-    private $path;
+    private $filename;
 
     /**
-     * @param string $file
+     * @param string $filename
      * @throws \ByJG\Serializer\Exception\InvalidArgumentException
      * @throws \ByJG\Util\Exception\XmlUtilException
      */
-    public function __construct($file = null)
+    public function __construct($filename = null)
     {
         $this->collection = array();
         $this->currentRow = -1;
 
-        $this->path = null;
+        $this->filename = null;
+        $this->defineSavePath($filename, function () {
+            if (!is_null($this->filename)) {
+                $this->createFrom($this->filename);
+            }
+        });
+    }
+
+    public function getFilename()
+    {
+        return $this->filename;
+    }
+
+    private function defineSavePath($file, $closure)
+    {
         if (!is_null($file)) {
             if (!is_string($file)) {
                 throw new \InvalidArgumentException('I expected a string as a file name');
             }
 
             $ext = pathinfo($file, PATHINFO_EXTENSION);
-            if (empty($ext)) {
+            if (empty($ext) && substr($file, 0, 6) !== "php://") {
                 $file .= '.anydata.xml';
             }
-            $this->path = $file;
-
-            $this->createFrom($this->path);
+            $this->filename = $file;
         }
+
+        $closure();
     }
 
     /**
@@ -151,25 +165,19 @@ public function getAsDom()
     }
 
     /**
-     * @param string $file
+     * @param string $filename
      * @throws DatabaseException
      * @throws \ByJG\Util\Exception\XmlUtilException
      */
-    public function save($file = null)
+    public function save($filename = null)
     {
-        if (!is_null($file)) {
-            if (!is_string($file)) {
-                throw new InvalidArgumentException('Invalid file name');
+        $this->defineSavePath($filename, function () {
+            if (is_null($this->filename)) {
+                throw new DatabaseException("No such file path to save anydataset");
             }
 
-            $this->path = $file;
-        }
-
-        if (is_null($this->path)) {
-            throw new DatabaseException("No such file path to save anydataset");
-        }
-
-        XmlUtil::saveXmlDocument($this->getAsDom(), $this->path);
+            XmlUtil::saveXmlDocument($this->getAsDom(), $this->filename);
+        });
     }
 
     /**
diff --git a/src/AnyIterator.php b/src/AnyIterator.php
index 3509522..4e70666 100644
--- a/src/AnyIterator.php
+++ b/src/AnyIterator.php
@@ -23,7 +23,7 @@ class AnyIterator extends GenericIterator
     /**
      * Iterator constructor
      *
-*@param Row[] $list
+     * @param Row[] $list
      */
 
     public function __construct($list)
@@ -53,7 +53,7 @@ public function hasNext()
     /**
      * Return the next row.
      *
-*@return Row
+     * @return Row
      */
     public function moveNext()
     {
diff --git a/tests/AnyDatasetTest.php b/tests/AnyDatasetTest.php
index 2a1594e..0fefcbe 100644
--- a/tests/AnyDatasetTest.php
+++ b/tests/AnyDatasetTest.php
@@ -60,6 +60,21 @@ public function testConstructorString()
                 "field2" => "othervalue2",
             ],
             ], $anydata->getIterator()->toArray());
+
+        $anydataMem = new AnyDataset("php://memory");
+        $anydataMem->import($anydata->getIterator());
+        $this->assertEquals(2, count($anydataMem->getIterator()->toArray()));
+        $this->assertEquals([
+            [
+                "field1" => "value1",
+                "field2" => "value2",
+            ],
+            [
+                "field1" => "othervalue1",
+                "field2" => "othervalue2",
+            ],
+        ], $anydata->getIterator()->toArray());
+        $anydataMem->save();
     }
 
     public function testXML()