diff --git a/README.md b/README.md
index e1c2c68..760ba56 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,39 @@ foreach ($reader as $row) {
     // row is an array
 }
 ```
+
+# Documentation
+
+## DatasetManager
+
+The `DatasetManager` will automatically locate and load datasets on startup.
+
+```
+getDataset(string $identifier): Dataset
+    Return a Dataset object, or throw exception on error
+openDataset(string $identifer): Iterator
+    Return a reader for a Dataset, same as getDataset()->open()
+getAvailableDatasets(): array
+    Returns the Dataset objects for all datasets found
+```
+
+## Dataset
+
+```
+open(): Iterator
+    Return an iterator to iterate over the data
+filter(array|callable $condition): Iterator
+    Return an iterator that only returns rows matching filter
+getIdentifier(): string
+    Return the dataset identifier (vendor/package#dataset)
+getVersion(): string
+    Return the package version of the dataset
+getPackageName(): string
+    Return the package name (vendor/package)
+getDatasetName(): string
+    Return the dataset name (dataset)
+getLicense(): ?string
+    Return the license for the dataset
+getComment(): ?string
+    Return the dataset comment
+```
\ No newline at end of file
diff --git a/bin/dataset-info b/bin/dataset-info
index 0009739..874e2e2 100755
--- a/bin/dataset-info
+++ b/bin/dataset-info
@@ -3,13 +3,15 @@
 
 foreach ([
     __DIR__."/..",
-    __DIR__."/../vendor",
+    __DIR__."/../..",
     __DIR__."/../../..",
-    __DIR__."/vendor",
 ] as $dir) {
     if (file_exists($dir."/autoload.php")) {
         define("COMPOSER_VENDOR_PATH", $dir);
         require_once $dir."/autoload.php";
+    } elseif (file_exists($dir."/vendor/autoload.php")) {
+        define("COMPOSER_VENDOR_PATH", $dir."/vendor");
+        require_once $dir."/vendor/autoload.php";
     }
 }
 
@@ -17,8 +19,20 @@ $datasetManager = new NoccyLabs\Dataset\DatasetManager();
 
 $datasets = $datasetManager->getAvailableDatasets();
 
+function _printf(string $fmt, ...$args): void {
+    $out = sprintf($fmt, ...$args);
+    if (!posix_isatty(STDOUT)) {
+        $out = preg_replace("<\e\\[[0-9;]+m>", "", $out);
+    }
+    echo $out;
+}
+
 foreach ($datasets as $dataset) {
-    echo $dataset->getIdentifier()." (".$dataset->getVersion().")\n";
+    _printf("Identifier:  \e[36m%s\e[35m#\e[36;1m%s\e[0m\n", $dataset->getPackageName(), $dataset->getDatasetName());
+    //  $dataset->getIdentifier()."\n";
+    _printf("    Package: \e[33m%s\e[0m\n", $dataset->getPackageName());
+    _printf("    Dataset: \e[33m%s\e[0m\n", $dataset->getDatasetName());
+    _printf("    Version: \e[33m%s\e[0m\n", $dataset->getVersion());
     $reader = $dataset->open();
     $rows = 0;
     $headers = null;
@@ -26,5 +40,6 @@ foreach ($datasets as $dataset) {
         if (!$headers) $headers = array_keys($row);
         $rows++;
     }
-    echo "  # ".$rows." rows\n  - ".join("\n  - ",$headers)."\n";
+    _printf("    Rows:    \e[33m%d\e[0m\n", $rows);
+    _printf("    Fields:  \e[32;1m%s\e[0m\n", join("\e[0m\n             \e[32;1m",$headers));
 }
diff --git a/src/Dataset.php b/src/Dataset.php
index 1ae1008..d32c3ef 100644
--- a/src/Dataset.php
+++ b/src/Dataset.php
@@ -2,9 +2,15 @@
 
 namespace NoccyLabs\Dataset;
 
+use Iterator;
 use NoccyLabs\Dataset\Readers\CsvReader;
 use NoccyLabs\Dataset\Readers\JsonReader;
 
+/**
+ * 
+ * 
+ * 
+ */
 class Dataset
 {
     protected string $packageName;
@@ -15,48 +21,83 @@ class Dataset
     
     protected array $options;
 
-    protected ?string $version;
+    protected string $version;
 
+    /**
+     * 
+     * 
+     * @param string $identifier The identifier for the dataset (vendor/package#dataset)
+     * @param array $options Configured options for the dataset
+     * @param string|null $version The package version
+     */
     public function __construct(string $identifier, array $options, ?string $version=null)
     {
         $this->identifier = $identifier;
         $this->options = $options;
-        $this->version = $version;
+        $this->version = $version??"0.0.0.0";
 
         [$this->packageName, $this->datasetName] = explode("#", $identifier, 2);
     }
 
+    /**
+     * 
+     * @return string
+     */
     public function getIdentifier(): string
     {
         return $this->identifier;
     }
 
+    /**
+     * 
+     * @return string
+     */
     public function getPackageName(): string
     {
         return $this->packageName;
     }
 
+    /**
+     * 
+     * @return string
+     */
     public function getDatasetName(): string
     {
         return $this->datasetName;
     }
 
-    public function getVersion(): ?string
+    /**
+     * 
+     * @return string
+     */
+    public function getVersion(): string
     {
         return $this->version;
     }
 
+    /**
+     * 
+     * @return string|null
+     */
     public function getComment(): ?string
     {
         return array_key_exists('comment', $this->options) ? $this->options['comment'] : null;
     }
 
+    /**
+     * 
+     * @return string|null
+     */
     public function getLicense(): ?string
     {
         return array_key_exists('license', $this->options) ? $this->options['license'] : null;
     }
 
-    public function open(): ReaderInterface
+    /**
+     * 
+     * @return Iterator
+     */
+    public function open(): Iterator
     {
         $filename = $this->options['filename'];
         $reader = $this->determineReaderForFile($filename);
@@ -64,6 +105,11 @@ class Dataset
         return $inst;
     }
 
+    /**
+     * 
+     * @param string $filename
+     * @return string
+     */
     private function determineReaderForFile(string $filename): string
     {
         if ($reader = $this->options['reader']??null) {
diff --git a/src/DatasetManager.php b/src/DatasetManager.php
index 3123122..c13a591 100644
--- a/src/DatasetManager.php
+++ b/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();
diff --git a/src/FilteringReaderIterator.php b/src/FilteringReaderIterator.php
new file mode 100644
index 0000000..0a89de9
--- /dev/null
+++ b/src/FilteringReaderIterator.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace NoccyLabs\Dataset;
+
+use Iterator;
+
+class FilteringReaderIterator implements Iterator
+{
+    private Iterator $reader;
+
+    private $condition;
+
+    public function __construct(Iterator $reader, array|callable $condition)
+    {
+        $this->reader = $reader;
+        $this->condition = $condition;
+    }
+
+    public function current(): mixed
+    {
+        return $this->reader->current();        
+    }
+
+    public function key(): mixed
+    {
+        return $this->reader->key();        
+    }
+
+    public function valid(): bool
+    {
+        return $this->reader->valid();
+    }
+
+    public function next(): void
+    {
+        $this->reader->next();
+        while ($this->reader->valid()) {
+            $curr = $this->reader->current();
+            if ($this->matchCondition($curr)) 
+                break;
+            $this->reader->next();
+        }        
+    }
+
+    public function rewind(): void
+    {
+        $this->reader->rewind();
+        while ($this->reader->valid()) {
+            $curr = $this->reader->current();
+            if ($this->matchCondition($curr)) 
+                break;
+            $this->reader->next();
+        }
+    }
+
+    /**
+     * Test a condition against a row
+     * 
+     * The matched conditions are:
+     *   - string/bool/int/float - match value
+     *   - array - all conditions in array must match:
+     *     - eq     equals
+     *     - neq    not equals
+     *     - gt     greater than
+     *     - gte    greater than or equal
+     *     - lt     less than
+     *     - in     value in array
+     *     - nin    value not in array
+     */
+    private function matchCondition(array $row): bool
+    {
+        if (is_callable($this->condition)) {
+            return (bool)call_user_func($this->condition, $row);
+        }
+        foreach ($this->condition as $field=>$test) {
+            if (!array_key_exists($field, $row)) continue;
+            if (is_array($test)) {
+                if (array_key_exists('eq',$test) && $row[$field] != $test['eq']) return false;
+                if (array_key_exists('neq',$test) && $row[$field] == $test['neq']) return false;
+                if (array_key_exists('gt',$test) && $row[$field] <= $test['gt']) return false;
+                if (array_key_exists('gte',$test) && $row[$field] < $test['gte']) return false;
+                if (array_key_exists('lt',$test) && $row[$field] >= $test['lt']) return false;
+                if (array_key_exists('lte',$test) && $row[$field] > $test['lte']) return false;
+                if (array_key_exists('in',$test) && !in_array($row[$field], $test['in'])) return false;
+                if (array_key_exists('nin',$test) && in_array($row[$field], $test['in'])) return false;
+            } else {
+                if ($row[$field] != $test) return false;
+            }
+        }
+        return true;
+    }
+}
diff --git a/src/Readers/CsvReader.php b/src/Readers/CsvReader.php
index b528d79..3d5edf0 100644
--- a/src/Readers/CsvReader.php
+++ b/src/Readers/CsvReader.php
@@ -45,12 +45,16 @@ class CsvReader implements ReaderInterface
 
     private function loadData(array $data)
     {
-        // FIXME parse data according to directives if present
+        $separator = $this->options['separator']??',';
+        $enclosure = $this->options['enclosure']??'"';
+        $escape = $this->options['escape']??"\\";
+
+
         $head = str_getcsv(array_shift($data));
         $this->data = [];
         foreach ($data as $row) {
             if ($row) {
-                $row = str_getcsv($row);
+                $row = str_getcsv($row, $separator, $enclosure, $escape);
                 $this->data[] = array_combine($head, $row);
             }
         }
diff --git a/src/Readers/JsonReader.php b/src/Readers/JsonReader.php
index 8e44440..176b830 100644
--- a/src/Readers/JsonReader.php
+++ b/src/Readers/JsonReader.php
@@ -35,8 +35,10 @@ class JsonReader implements ReaderInterface
             //printf("Reached end of set at slice=%d\n", $this->currentFile);
             return;
         }
+
+        $flags = ($this->options['bigintAsString']??false)?JSON_BIGINT_AS_STRING:0;
         $file = $this->files[$this->currentFile]; 
-        $json = @json_decode(@file_get_contents($file), true);
+        $json = @json_decode(@file_get_contents($file), true, flags:$flags);
 
         $this->loadData($json);
         $this->loadedFile = $this->currentFile;
diff --git a/tests/foo/bar/dataset.json b/tests/foo/bar/dataset.json
deleted file mode 100644
index 6e05263..0000000
--- a/tests/foo/bar/dataset.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-    "datasets": {
-        "baz": {
-            "filename": "data/test.csv"
-        }
-    }
-}
diff --git a/tests/src/DatasetManagerTest.php b/tests/src/DatasetManagerTest.php
index b5d7780..cc77053 100644
--- a/tests/src/DatasetManagerTest.php
+++ b/tests/src/DatasetManagerTest.php
@@ -16,6 +16,6 @@ class DatasetManagerTest extends \PHPUnit\Framework\TestCase
         $dm = new DatasetManager();
     
         $sets = $dm->getAvailableDatasets();
-        $this->assertEquals(1, count($sets), "Expected 1 loaded set");
+        $this->assertEquals(2, count($sets), "Expected 2 loaded set");
     }
 }
diff --git a/tests/src/FilteringReaderIteratorTest.php b/tests/src/FilteringReaderIteratorTest.php
new file mode 100644
index 0000000..2a224f2
--- /dev/null
+++ b/tests/src/FilteringReaderIteratorTest.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace NoccyLabs\Dataset;
+
+use ArrayIterator;
+use Iterator;
+
+class FilteringReaderIteratorTest extends \PHPUnit\Framework\TestCase
+{
+
+    /**
+     * @covers FilteringReaderIterator
+     */
+    public function testSimpleFiltering()
+    {
+        $arr = iterator_to_array(
+            new FilteringReaderIterator(
+                $this->getTestIterator(), [
+                    "alpha" => 3
+        ]));
+
+        $this->assertEquals(1, count($arr));
+        $this->assertEquals(3, $arr[2]['alpha']);
+        $this->assertEquals('red', $arr[2]['beta']);
+        $this->assertEquals(null, $arr[2]['gamma']);
+
+    }
+
+    /**
+     * @covers FilteringReaderIterator
+     */
+    public function testFilteringOnRange()
+    {
+        $arr = iterator_to_array(
+            new FilteringReaderIterator(
+                $this->getTestIterator(), [
+                    "alpha" => [ 'gt' => 2, 'lt' => 5 ]
+        ]));
+
+        $this->assertEquals(2, count($arr));
+    }
+
+    /**
+     * @covers FilteringReaderIterator
+     */
+    public function testFilteringOnRangeInclusive()
+    {
+        $arr = iterator_to_array(
+            new FilteringReaderIterator(
+                $this->getTestIterator(), [
+                    "alpha" => [ 'gt' => 2, 'lte' => 5 ]
+        ]));
+
+        $this->assertEquals(3, count($arr));
+    }
+
+    private function getTestData(): array
+    {
+        return [
+            [ 'alpha' => 1, 'beta' => 'green',  'gamma' => true ],
+            [ 'alpha' => 2, 'beta' => 'blue',   'gamma' => false ],
+            [ 'alpha' => 3, 'beta' => 'red',    'gamma' => null ],
+            [ 'alpha' => 4, 'beta' => 'yellow', 'gamma' => false ],
+            [ 'alpha' => 5, 'beta' => 'pink',   'gamma' => true ],
+        ];
+    }
+
+    private function getTestIterator(): Iterator
+    {
+        return new ArrayIterator($this->getTestData());
+    }
+}
diff --git a/tests/src/Readers/CsvReaderTest.php b/tests/src/Readers/CsvReaderTest.php
new file mode 100644
index 0000000..6d56c2c
--- /dev/null
+++ b/tests/src/Readers/CsvReaderTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace NoccyLabs\Dataset\Readers;
+
+
+class CsvReaderTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers CsvReader
+     */
+    public function testReadingSingleFile()
+    {
+        $reader = new CsvReader(__DIR__."/../../test/test/data/data.csv", []);
+        $arr = iterator_to_array($reader);
+
+        $this->assertEquals(5, count($arr), "Expected 5 items");
+    }
+
+    /**
+     * @covers CsvReader
+     */
+    public function testReadingSplitFile()
+    {
+        $reader = new CsvReader(__DIR__."/../../test/test/data/*.csv", []);
+        $arr = iterator_to_array($reader);
+
+        $this->assertEquals(5, count($arr), "Expected 5 items");
+    }
+}
\ No newline at end of file
diff --git a/tests/test/test/data/data.csv b/tests/test/test/data/data.csv
new file mode 100644
index 0000000..e3d837b
--- /dev/null
+++ b/tests/test/test/data/data.csv
@@ -0,0 +1,6 @@
+"a";"b"
+1;a
+2;b
+3;c
+4;d
+5;e
\ No newline at end of file
diff --git a/tests/test/test/data/data.json b/tests/test/test/data/data.json
new file mode 100644
index 0000000..a92c895
--- /dev/null
+++ b/tests/test/test/data/data.json
@@ -0,0 +1,7 @@
+[
+    { "a": 1, "b": "a" },
+    { "a": 2, "b": "b" },
+    { "a": 3, "b": "c" },
+    { "a": 4, "b": "d" },
+    { "a": 5, "b": "e" }
+]
\ No newline at end of file
diff --git a/tests/test/test/dataset.json b/tests/test/test/dataset.json
new file mode 100644
index 0000000..c734226
--- /dev/null
+++ b/tests/test/test/dataset.json
@@ -0,0 +1,10 @@
+{
+    "datasets": {
+        "csv": {
+            "filename": "data/data.csv"
+        },
+        "json": {
+            "filename": "data/data.json"
+        }
+    }
+}