diff --git a/common/research/common/dataset/roco_dataset_descriptor.py b/common/research/common/dataset/roco_dataset_descriptor.py
index 1fb8c289bf02f81ab6dd34260d556eaf41dd40e4..f957eeaf5a21afcf55b962e0615996ca0845783a 100644
--- a/common/research/common/dataset/roco_dataset_descriptor.py
+++ b/common/research/common/dataset/roco_dataset_descriptor.py
@@ -4,13 +4,10 @@ from pathlib import Path
 from typing import Dict
 
 from pandas import DataFrame
-
 from polystar.common.models.object import Armor, ObjectType
 from polystar.common.utils.markdown import MarkdownFile
-from research.common.dataset.dji.dji_roco_datasets import DJIROCODataset
-from research.common.dataset.dji.dji_roco_zoomed_datasets import DJIROCOZoomedDataset
-from research.common.dataset.roco_dataset import ROCODataset
-from research.common.dataset.twitch.twitch_roco_datasets import TwitchROCODataset
+from research.common.datasets.roco.roco_dataset import ROCODataset
+from research.common.datasets.roco.zoo.roco_datasets_zoo import ROCODatasetsZoo
 
 
 @dataclass
@@ -31,7 +28,7 @@ class ROCODatasetStats:
         rv.armors_color2num2count = {c: {n: 0 for n in range(10)} for c in colors}
         for c in colors:
             rv.armors_color2num2count[c]["total"] = 0
-        for annotation in dataset.image_annotations:
+        for annotation in dataset.targets:
             rv.n_images += 1
             rv.n_runes += annotation.has_rune
             for obj in annotation.objects:
@@ -49,12 +46,12 @@ class ROCODatasetStats:
 
 
 def make_markdown_dataset_report(dataset: ROCODataset, report_dir: Path):
-    report_path = report_dir / f"dset_{dataset.dataset_name}_report.md"
+    report_path = report_dir / f"dset_{dataset.name}_report.md"
 
     stats = ROCODatasetStats.from_dataset(dataset)
 
     with MarkdownFile(report_path) as mf:
-        mf.title(f"Dataset {dataset.dataset_name}")
+        mf.title(f"Dataset {dataset.name}")
 
         mf.paragraph(f"{stats.n_images} images, with:")
         mf.list(
@@ -69,5 +66,5 @@ def make_markdown_dataset_report(dataset: ROCODataset, report_dir: Path):
 
 
 if __name__ == "__main__":
-    for dset in chain(TwitchROCODataset, DJIROCOZoomedDataset, DJIROCODataset):
+    for dset in chain(*ROCODatasetsZoo()):
         make_markdown_dataset_report(dset, dset.dataset_path)
diff --git a/common/research/common/datasets/roco/directory_roco_dataset.py b/common/research/common/datasets/roco/directory_roco_dataset.py
index e59163fdd91864804debeebb710d229b4b723df4..ba8f09ec04145f60088a73486921b9c2752f09fb 100644
--- a/common/research/common/datasets/roco/directory_roco_dataset.py
+++ b/common/research/common/datasets/roco/directory_roco_dataset.py
@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import Iterable, Tuple
+from typing import Iterable, List, Tuple
 
 from more_itertools import ilen
 from polystar.common.models.image import Image
@@ -12,6 +12,12 @@ class DirectoryROCODataset(ROCODataset):
         super().__init__(name)
         self.dataset_path = dataset_path
 
+    @property
+    def targets(self) -> List[ROCOAnnotation]:
+        if self._is_loaded:
+            return super().targets
+        return list(map(ROCOAnnotation.from_xml_file, self.annotation_paths))
+
     @property
     def images_dir_path(self) -> Path:
         return self.dataset_path / "image"
diff --git a/common/research/common/datasets/roco/zoo/roco_datasets_zoo.py b/common/research/common/datasets/roco/zoo/roco_datasets_zoo.py
index a11d78b5dab37d8ba561b44025bb2228529aa937..cfeab521b01bdc016dcfa740b4bbe8313cb9d7a4 100644
--- a/common/research/common/datasets/roco/zoo/roco_datasets_zoo.py
+++ b/common/research/common/datasets/roco/zoo/roco_datasets_zoo.py
@@ -7,3 +7,6 @@ class ROCODatasetsZoo:
     DJI_ZOOMED = DJIROCOZoomedDatasets()
     DJI = DJIROCODatasets()
     TWITCH = TwitchROCODatasets()
+
+    def __iter__(self):
+        return (self.DJI, self.DJI_ZOOMED, self.TWITCH).__iter__()
diff --git a/common/tests/common/unittests/datasets/roco/test_directory_dataset_zoo.py b/common/tests/common/unittests/datasets/roco/test_directory_dataset_zoo.py
new file mode 100644
index 0000000000000000000000000000000000000000..a25ff21a19a37fa73ed4d438085293e500402e21
--- /dev/null
+++ b/common/tests/common/unittests/datasets/roco/test_directory_dataset_zoo.py
@@ -0,0 +1,19 @@
+from pathlib import Path
+from tempfile import TemporaryDirectory
+from unittest import TestCase
+
+from research.common.datasets.roco.directory_roco_dataset import \
+    DirectoryROCODataset
+from research.common.datasets.roco.roco_annotation import ROCOAnnotation
+
+
+class TestDirectoryROCODataset(TestCase):
+    def test_lazy_targets(self):
+        with TemporaryDirectory() as dataset_dir:
+            dataset = DirectoryROCODataset(Path(dataset_dir), "fake")
+            dataset.annotations_dir_path.mkdir()
+
+            annotation = ROCOAnnotation("frame_1", objects=[], has_rune=False, w=160, h=90)
+            (dataset.annotations_dir_path / "frame_1.xml").write_text(annotation.to_xml())
+
+            self.assertEqual([annotation], dataset)