diff --git a/src/Spout/Reader/Exception/IteratorNotRewindableException.php b/src/Spout/Reader/Exception/IteratorNotRewindableException.php
new file mode 100644
index 0000000..0277fa3
--- /dev/null
+++ b/src/Spout/Reader/Exception/IteratorNotRewindableException.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace Box\Spout\Reader\Exception;
+
+/**
+ * Class IteratorNotRewindableException
+ *
+ * @package Box\Spout\Reader\Exception
+ */
+class IteratorNotRewindableException extends ReaderException
+{
+}
diff --git a/src/Spout/Reader/ODS/Reader.php b/src/Spout/Reader/ODS/Reader.php
new file mode 100644
index 0000000..c59ab57
--- /dev/null
+++ b/src/Spout/Reader/ODS/Reader.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Box\Spout\Reader\ODS;
+
+use Box\Spout\Common\Exception\IOException;
+use Box\Spout\Reader\AbstractReader;
+
+/**
+ * Class Reader
+ * This class provides support to read data from a ODS file
+ *
+ * @package Box\Spout\Reader\ODS
+ */
+class Reader extends AbstractReader
+{
+    /** @var \ZipArchive */
+    protected $zip;
+
+    /** @var SheetIterator To iterator over the ODS sheets */
+    protected $sheetIterator;
+
+    /**
+     * Opens the file at the given file path to make it ready to be read.
+     *
+     * @param  string $filePath Path of the file to be read
+     * @return void
+     * @throws \Box\Spout\Common\Exception\IOException If the file at the given path or its content cannot be read
+     * @throws \Box\Spout\Reader\Exception\NoSheetsFoundException If there are no sheets in the file
+     */
+    protected function openReader($filePath)
+    {
+        $this->zip = new \ZipArchive();
+
+        if ($this->zip->open($filePath) === true) {
+            $this->sheetIterator = new SheetIterator($filePath);
+        } else {
+            throw new IOException("Could not open $filePath for reading.");
+        }
+    }
+
+    /**
+     * Returns an iterator to iterate over sheets.
+     *
+     * @return SheetIterator To iterate over sheets
+     */
+    public function getConcreteSheetIterator()
+    {
+        return $this->sheetIterator;
+    }
+
+    /**
+     * Closes the reader. To be used after reading the file.
+     *
+     * @return void
+     */
+    protected function closeReader()
+    {
+        if ($this->zip) {
+            $this->zip->close();
+        }
+    }
+}
diff --git a/src/Spout/Reader/ODS/RowIterator.php b/src/Spout/Reader/ODS/RowIterator.php
new file mode 100644
index 0000000..1130226
--- /dev/null
+++ b/src/Spout/Reader/ODS/RowIterator.php
@@ -0,0 +1,314 @@
+<?php
+
+namespace Box\Spout\Reader\ODS;
+
+use Box\Spout\Common\Exception\IOException;
+use Box\Spout\Reader\Exception\IteratorNotRewindableException;
+use Box\Spout\Reader\Exception\XMLProcessingException;
+use Box\Spout\Reader\IteratorInterface;
+use Box\Spout\Reader\Wrapper\XMLReader;
+
+/**
+ * Class RowIterator
+ *
+ * @package Box\Spout\Reader\ODS
+ */
+class RowIterator implements IteratorInterface
+{
+    /** Definition of all possible cell types */
+    const CELL_TYPE_STRING = 'string';
+    const CELL_TYPE_BOOLEAN = 'boolean';
+    const CELL_TYPE_FLOAT = 'float';
+
+    /** Definition of XML nodes names used to parse data */
+    const XML_NODE_TABLE = 'table:table';
+    const XML_NODE_ROW = 'table:table-row';
+    const XML_NODE_CELL = 'table:table-cell';
+    const XML_NODE_P = 'p';
+    const XML_NODE_S = 'text:s';
+
+    /** Definition of XML attribute used to parse data */
+    const XML_ATTRIBUTE_TYPE = 'office:value-type';
+    const XML_ATTRIBUTE_NUM_COLUMNS_REPEATED = 'table:number-columns-repeated';
+    const XML_ATTRIBUTE_C = 'text:c';
+
+    /** @var \Box\Spout\Reader\Wrapper\XMLReader The XMLReader object that will help read sheet's XML data */
+    protected $xmlReader;
+
+    /** @var bool Whether the iterator has already been rewound once */
+    protected $hasAlreadyBeenRewound = false;
+
+    /** @var \Box\Spout\Common\Escaper\ODS Used to unescape XML data */
+    protected $escaper;
+
+    /** @var int Number of read rows */
+    protected $numReadRows = 0;
+
+    /** @var array|null Buffer used to store the row data, while checking if there are more rows to read */
+    protected $rowDataBuffer = null;
+
+    /** @var bool Indicates whether all rows have been read */
+    protected $hasReachedEndOfFile = false;
+
+    /**
+     * @param XMLReader $xmlReader XML Reader, positioned on the "<table:table>" element
+     */
+    public function __construct($xmlReader)
+    {
+        $this->xmlReader = $xmlReader;
+
+        /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
+        $this->escaper = new \Box\Spout\Common\Escaper\ODS();
+    }
+
+    /**
+     * Rewind the Iterator to the first element.
+     * NOTE: It can only be done once, as it is not possible to read an XML file backwards.
+     * @link http://php.net/manual/en/iterator.rewind.php
+     *
+     * @return void
+     * @throws \Box\Spout\Reader\Exception\IteratorNotRewindableException If the iterator is rewound more than once
+     */
+    public function rewind()
+    {
+        // Because sheet and row data is located in the file, we can't rewind both the
+        // sheet iterator and the row iterator, as XML file cannot be read backwards.
+        // Therefore, rewinding the row iterator has been disabled.
+        if ($this->hasAlreadyBeenRewound) {
+            throw new IteratorNotRewindableException();
+        }
+
+        $this->hasAlreadyBeenRewound = true;
+        $this->numReadRows = 0;
+        $this->rowDataBuffer = null;
+        $this->hasReachedEndOfFile = false;
+
+        $this->next();
+    }
+
+    /**
+     * Checks if current position is valid
+     * @link http://php.net/manual/en/iterator.valid.php
+     *
+     * @return boolean
+     */
+    public function valid()
+    {
+        return (!$this->hasReachedEndOfFile);
+    }
+
+    /**
+     * Move forward to next element. Empty rows will be skipped.
+     * @link http://php.net/manual/en/iterator.next.php
+     *
+     * @return void
+     * @throws \Box\Spout\Reader\Exception\SharedStringNotFoundException If a shared string was not found
+     * @throws \Box\Spout\Common\Exception\IOException If unable to read the sheet data XML
+     */
+    public function next()
+    {
+        $rowData = [];
+        $cellValue = null;
+        $numColumnsRepeated = 1;
+        $numCellsRead = 0;
+        $hasAlreadyReadOneCell = false;
+
+        try {
+            while ($this->xmlReader->read()) {
+                if ($this->xmlReader->isPositionedOnStartingNode(self::XML_NODE_CELL)) {
+                    // Start of a cell description
+                    $currentNumColumnsRepeated = $this->getNumColumnsRepeatedForCurrentNode();
+
+                    $node = $this->xmlReader->expand();
+                    $currentCellValue = $this->getCellValue($node);
+
+                    // process cell N only after having read cell N+1 (see below why)
+                    if ($hasAlreadyReadOneCell) {
+                        for ($i = 0; $i < $numColumnsRepeated; $i++) {
+                            $rowData[] = $cellValue;
+                        }
+                    }
+
+                    $cellValue = $currentCellValue;
+                    $numColumnsRepeated = $currentNumColumnsRepeated;
+
+                    $numCellsRead++;
+                    $hasAlreadyReadOneCell = true;
+
+                } else if ($this->xmlReader->isPositionedOnEndingNode(self::XML_NODE_ROW)) {
+                    // End of the row description
+                    $isEmptyRow = ($numCellsRead <= 1 && empty($cellValue));
+                    if ($isEmptyRow) {
+                        // skip empty rows
+                        $this->next();
+                        return;
+                    }
+
+                    // Only add value if the last read cell is not empty or does not need to repeat cell values.
+                    // This is to avoid creating a lot of empty cells, as Excel adds a last empty "<table:table-cell>"
+                    // with a number-columns-repeated value equals to the number of (supported columns - used columns).
+                    // In Excel, the number of supported columns is 16384, but we don't want to returns rows with always 16384 cells.
+                    if (!empty($cellValue) || $numColumnsRepeated === 1) {
+                        for ($i = 0; $i < $numColumnsRepeated; $i++) {
+                            $rowData[] = $cellValue;
+                        }
+
+                        $this->numReadRows++;
+                    }
+                    break;
+
+                } else if ($this->xmlReader->isPositionedOnEndingNode(self::XML_NODE_TABLE)) {
+                    // The closing "</table:table>" marks the end of the file
+                    $this->hasReachedEndOfFile = true;
+                    break;
+                }
+            }
+
+        } catch (XMLProcessingException $exception) {
+            throw new IOException("The sheet's data cannot be read. [{$exception->getMessage()}]");
+        }
+
+        $this->rowDataBuffer = $rowData;
+    }
+
+    /**
+     * @return int The value of "table:number-columns-repeated" attribute of the current node, or 1 if attribute missing
+     */
+    protected function getNumColumnsRepeatedForCurrentNode()
+    {
+        $numColumnsRepeated = $this->xmlReader->getAttribute(self::XML_ATTRIBUTE_NUM_COLUMNS_REPEATED);
+        return ($numColumnsRepeated !== null) ? intval($numColumnsRepeated) : 1;
+    }
+
+    /**
+     * Returns the (unescaped) correctly marshalled, cell value associated to the given XML node.
+     * @TODO Add other types !!
+     *
+     * @param \DOMNode $node
+     * @return string|int|float|bool The value associated with the cell (or empty string if cell's type is undefined)
+     */
+    protected function getCellValue($node)
+    {
+        $cellType = $node->getAttribute(self::XML_ATTRIBUTE_TYPE);
+        $pNodeValue = $this->getTextPNodeValue($node);
+
+        switch ($cellType) {
+            case self::CELL_TYPE_STRING:
+                return $this->formatStringCellValue($node);
+            case self::CELL_TYPE_FLOAT:
+                return $this->formatFloatCellValue($pNodeValue);
+            case self::CELL_TYPE_BOOLEAN:
+                return $this->formatBooleanCellValue($pNodeValue);
+            default:
+                return '';
+        }
+    }
+
+    /**
+     * Returns the value of the first "<text:p>" node within the given node.
+     *
+     * @param \DOMNode $node
+     * @return string Value for the first "<text:p>" node or empty string if no "<text:p>" found
+     */
+    protected function getTextPNodeValue($node)
+    {
+        $nodeValue = '';
+        $pNodes = $node->getElementsByTagName(self::XML_NODE_P);
+
+        if ($pNodes->length > 0) {
+            $nodeValue = $pNodes->item(0)->nodeValue;
+        }
+
+        return $nodeValue;
+    }
+
+    /**
+     * Returns the cell String value.
+     *
+     * @param \DOMNode $node
+     * @return string The value associated with the cell
+     */
+    protected function formatStringCellValue($node)
+    {
+        $pNodeValues = [];
+        $pNodes = $node->getElementsByTagName(self::XML_NODE_P);
+
+        foreach ($pNodes as $pNode) {
+            $currentPValue = '';
+
+            foreach ($pNode->childNodes as $childNode) {
+                if ($childNode instanceof \DOMText) {
+                    $currentPValue .= $childNode->nodeValue;
+                } else if ($childNode->nodeName === self::XML_NODE_S) {
+                    $spaceAttribute = $childNode->getAttribute(self::XML_ATTRIBUTE_C);
+                    $numSpaces = (!empty($spaceAttribute)) ? intval($spaceAttribute) : 1;
+                    $currentPValue .= str_repeat(' ', $numSpaces);
+                }
+            }
+
+            $pNodeValues[] = $currentPValue;
+        }
+
+        $escapedCellValue = implode("\n", $pNodeValues);
+        $cellValue = $this->escaper->unescape($escapedCellValue);
+        return $cellValue;
+    }
+
+    /**
+     * Returns the cell Numeric value from string of nodeValue.
+     *
+     * @param string $pNodeValue
+     * @return int|float The value associated with the cell
+     */
+    protected function formatFloatCellValue($pNodeValue)
+    {
+        $cellValue = is_int($pNodeValue) ? intval($pNodeValue) : floatval($pNodeValue);
+        return $cellValue;
+    }
+
+    /**
+     * Returns the cell Boolean value from a specific node's Value.
+     *
+     * @param string $pNodeValue
+     * @return bool The value associated with the cell
+     */
+    protected function formatBooleanCellValue($pNodeValue)
+    {
+        // !! is similar to boolval()
+        $cellValue = !!$pNodeValue;
+        return $cellValue;
+    }
+
+    /**
+     * Return the current element, from the buffer.
+     * @link http://php.net/manual/en/iterator.current.php
+     *
+     * @return array|null
+     */
+    public function current()
+    {
+        return $this->rowDataBuffer;
+    }
+
+    /**
+     * Return the key of the current element
+     * @link http://php.net/manual/en/iterator.key.php
+     *
+     * @return int
+     */
+    public function key()
+    {
+        return $this->numReadRows;
+    }
+
+
+    /**
+     * Cleans up what was created to iterate over the object.
+     *
+     * @return void
+     */
+    public function end()
+    {
+        $this->xmlReader->close();
+    }
+}
diff --git a/src/Spout/Reader/ODS/Sheet.php b/src/Spout/Reader/ODS/Sheet.php
new file mode 100644
index 0000000..c023182
--- /dev/null
+++ b/src/Spout/Reader/ODS/Sheet.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace Box\Spout\Reader\ODS;
+
+use Box\Spout\Reader\SheetInterface;
+use Box\Spout\Reader\Wrapper\XMLReader;
+
+/**
+ * Class Sheet
+ * Represents a sheet within a ODS file
+ *
+ * @package Box\Spout\Reader\ODS
+ */
+class Sheet implements SheetInterface
+{
+    /** @var RowIterator To iterate over sheet's rows */
+    protected $rowIterator;
+
+    /** @var int ID of the sheet */
+    protected $id;
+
+    /** @var int Index of the sheet, based on order of creation (zero-based) */
+    protected $index;
+
+    /** @var string Name of the sheet */
+    protected $name;
+
+    /**
+     * @param XMLReader $xmlReader XML Reader, positioned on the "<table:table>" element
+     * @param int $sheetIndex Index of the sheet, based on order of creation (zero-based)
+     * @param string $sheetName Name of the sheet
+     */
+    public function __construct($xmlReader, $sheetIndex, $sheetName)
+    {
+        $this->rowIterator = new RowIterator($xmlReader);
+        $this->index = $sheetIndex;
+        $this->name = $sheetName;
+    }
+
+    /**
+     * @return RowIterator
+     */
+    public function getRowIterator()
+    {
+        return $this->rowIterator;
+    }
+
+    /**
+     * @return int Index of the sheet, based on order of creation (zero-based)
+     */
+    public function getIndex()
+    {
+        return $this->index;
+    }
+
+    /**
+     * @return string Name of the sheet
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+}
diff --git a/src/Spout/Reader/ODS/SheetIterator.php b/src/Spout/Reader/ODS/SheetIterator.php
new file mode 100644
index 0000000..f8b9203
--- /dev/null
+++ b/src/Spout/Reader/ODS/SheetIterator.php
@@ -0,0 +1,135 @@
+<?php
+
+namespace Box\Spout\Reader\ODS;
+
+use Box\Spout\Common\Exception\IOException;
+use Box\Spout\Reader\Exception\XMLProcessingException;
+use Box\Spout\Reader\IteratorInterface;
+use Box\Spout\Reader\Wrapper\XMLReader;
+
+/**
+ * Class SheetIterator
+ * Iterate over ODS sheet.
+ *
+ * @package Box\Spout\Reader\ODS
+ */
+class SheetIterator implements IteratorInterface
+{
+    /** Definition of XML nodes name and attribute used to parse sheet data */
+    const XML_NODE_TABLE = 'table:table';
+    const XML_ATTRIBUTE_TABLE_NAME = 'table:name';
+
+    /** @var string $filePath Path of the file to be read */
+    protected $filePath;
+
+    /** @var XMLReader The XMLReader object that will help read sheet's XML data */
+    protected $xmlReader;
+
+    /** @var \Box\Spout\Common\Escaper\ODS Used to unescape XML data */
+    protected $escaper;
+
+    /** @var bool Whether there are still at least a sheet to be read */
+    protected $hasFoundSheet;
+
+    /** @var int The index of the sheet being read (zero-based) */
+    protected $currentSheetIndex;
+
+    /**
+     * @param string $filePath Path of the file to be read
+     * @throws \Box\Spout\Reader\Exception\NoSheetsFoundException If there are no sheets in the file
+     */
+    public function __construct($filePath)
+    {
+        $this->filePath = $filePath;
+        $this->xmlReader = new XMLReader();
+
+        /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
+        $this->escaper = new \Box\Spout\Common\Escaper\ODS();
+    }
+
+    /**
+     * Rewind the Iterator to the first element
+     * @link http://php.net/manual/en/iterator.rewind.php
+     *
+     * @return void
+     * @throws \Box\Spout\Common\Exception\IOException If unable to open the XML file containing sheets' data
+     */
+    public function rewind()
+    {
+        $this->xmlReader->close();
+
+        $contentXmlFilePath = $this->filePath . '#content.xml';
+        if ($this->xmlReader->open('zip://' . $contentXmlFilePath) === false) {
+            throw new IOException("Could not open \"{$contentXmlFilePath}\".");
+        }
+
+        try {
+            $this->hasFoundSheet = $this->xmlReader->readUntilNodeFound(self::XML_NODE_TABLE);
+        } catch (XMLProcessingException $exception) {
+           throw new IOException("The content.xml file is invalid and cannot be read. [{$exception->getMessage()}]");
+       }
+
+        $this->currentSheetIndex = 0;
+    }
+
+    /**
+     * Checks if current position is valid
+     * @link http://php.net/manual/en/iterator.valid.php
+     *
+     * @return boolean
+     */
+    public function valid()
+    {
+        return $this->hasFoundSheet;
+    }
+
+    /**
+     * Move forward to next element
+     * @link http://php.net/manual/en/iterator.next.php
+     *
+     * @return void
+     */
+    public function next()
+    {
+        $this->hasFoundSheet = $this->xmlReader->readUntilNodeFound(self::XML_NODE_TABLE);
+
+        if ($this->hasFoundSheet) {
+            $this->currentSheetIndex++;
+        }
+    }
+
+    /**
+     * Return the current element
+     * @link http://php.net/manual/en/iterator.current.php
+     *
+     * @return Sheet
+     */
+    public function current()
+    {
+        $escapedSheetName = $this->xmlReader->getAttribute(self::XML_ATTRIBUTE_TABLE_NAME);
+        $sheetName = $this->escaper->unescape($escapedSheetName);
+
+        return new Sheet($this->xmlReader, $sheetName, $this->currentSheetIndex);
+    }
+
+    /**
+     * Return the key of the current element
+     * @link http://php.net/manual/en/iterator.key.php
+     *
+     * @return int
+     */
+    public function key()
+    {
+        return $this->currentSheetIndex + 1;
+    }
+
+    /**
+     * Cleans up what was created to iterate over the object.
+     *
+     * @return void
+     */
+    public function end()
+    {
+        $this->xmlReader->close();
+    }
+}
diff --git a/src/Spout/Reader/ReaderFactory.php b/src/Spout/Reader/ReaderFactory.php
index 0e39f59..3a32094 100644
--- a/src/Spout/Reader/ReaderFactory.php
+++ b/src/Spout/Reader/ReaderFactory.php
@@ -33,6 +33,9 @@ class ReaderFactory
             case Type::XLSX:
                 $reader = new XLSX\Reader();
                 break;
+            case Type::ODS:
+                $reader = new ODS\Reader();
+                break;
             default:
                 throw new UnsupportedTypeException('No readers supporting the given type: ' . $readerType);
         }
diff --git a/src/Spout/Reader/Wrapper/XMLReader.php b/src/Spout/Reader/Wrapper/XMLReader.php
index fd33359..d48013f 100644
--- a/src/Spout/Reader/Wrapper/XMLReader.php
+++ b/src/Spout/Reader/Wrapper/XMLReader.php
@@ -138,4 +138,22 @@ class XMLReader extends \XMLReader
 
         return $wasNextSuccessful;
     }
+
+    /**
+     * @param string $nodeName
+     * @return bool Whether the XML Reader is currently positioned on the starting node with given name
+     */
+    public function isPositionedOnStartingNode($nodeName)
+    {
+        return ($this->nodeType === XMLReader::ELEMENT && $this->name === $nodeName);
+    }
+
+    /**
+     * @param string $nodeName
+     * @return bool Whether the XML Reader is currently positioned on the ending node with given name
+     */
+    public function isPositionedOnEndingNode($nodeName)
+    {
+        return ($this->nodeType === XMLReader::END_ELEMENT && $this->name === $nodeName);
+    }
 }
diff --git a/src/Spout/Reader/XLSX/Helper/SharedStringsHelper.php b/src/Spout/Reader/XLSX/Helper/SharedStringsHelper.php
index 9c4f746..6aafb52 100644
--- a/src/Spout/Reader/XLSX/Helper/SharedStringsHelper.php
+++ b/src/Spout/Reader/XLSX/Helper/SharedStringsHelper.php
@@ -83,7 +83,7 @@ class SharedStringsHelper
         $escaper = new \Box\Spout\Common\Escaper\XLSX();
 
         $sharedStringsFilePath = $this->getSharedStringsFilePath();
-        if ($xmlReader->open($sharedStringsFilePath, null, LIBXML_NONET) === false) {
+        if ($xmlReader->open($sharedStringsFilePath) === false) {
             throw new IOException('Could not open "' . self::SHARED_STRINGS_XML_FILE_PATH . '".');
         }
 
diff --git a/src/Spout/Reader/XLSX/Helper/SheetHelper.php b/src/Spout/Reader/XLSX/Helper/SheetHelper.php
index 577d58d..b1c393e 100644
--- a/src/Spout/Reader/XLSX/Helper/SheetHelper.php
+++ b/src/Spout/Reader/XLSX/Helper/SheetHelper.php
@@ -101,7 +101,6 @@ class SheetHelper
      */
     protected function getSheetFromXML($sheetDataXMLFilePath, $sheetIndexZeroBased)
     {
-        $sheetId = $sheetIndexZeroBased + 1;
         $sheetName = $this->getDefaultSheetName($sheetDataXMLFilePath);
 
         /*
@@ -123,7 +122,6 @@ class SheetHelper
 
             if (count($sheetNodes) === 1) {
                 $sheetNode = $sheetNodes[0];
-                $sheetId = (int) $sheetNode->getAttribute('sheetId');
                 $escapedSheetName = $sheetNode->getAttribute('name');
 
                 /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
@@ -132,7 +130,7 @@ class SheetHelper
             }
         }
 
-        return new Sheet($this->filePath, $sheetDataXMLFilePath, $this->sharedStringsHelper, $sheetId, $sheetIndexZeroBased, $sheetName);
+        return new Sheet($this->filePath, $sheetDataXMLFilePath, $this->sharedStringsHelper, $sheetIndexZeroBased, $sheetName);
     }
 
     /**
diff --git a/src/Spout/Reader/XLSX/RowIterator.php b/src/Spout/Reader/XLSX/RowIterator.php
index ed9db60..5b266e1 100644
--- a/src/Spout/Reader/XLSX/RowIterator.php
+++ b/src/Spout/Reader/XLSX/RowIterator.php
@@ -77,6 +77,7 @@ class RowIterator implements IteratorInterface
         $this->sharedStringsHelper = $sharedStringsHelper;
 
         $this->xmlReader = new XMLReader();
+
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
         $this->escaper = new \Box\Spout\Common\Escaper\XLSX();
     }
@@ -143,7 +144,7 @@ class RowIterator implements IteratorInterface
 
         try {
             while ($this->xmlReader->read()) {
-                if ($this->xmlReader->nodeType === XMLReader::ELEMENT && $this->xmlReader->name === self::XML_NODE_DIMENSION) {
+                if ($this->xmlReader->isPositionedOnStartingNode(self::XML_NODE_DIMENSION)) {
                     // Read dimensions of the sheet
                     $dimensionRef = $this->xmlReader->getAttribute(self::XML_ATTRIBUTE_REF); // returns 'A1:M13' for instance (or 'A1' for empty sheet)
                     if (preg_match('/[A-Z\d]+:([A-Z\d]+)/', $dimensionRef, $matches)) {
@@ -151,7 +152,7 @@ class RowIterator implements IteratorInterface
                         $this->numColumns = CellHelper::getColumnIndexFromCellIndex($lastCellIndex) + 1;
                     }
 
-                } else if ($this->xmlReader->nodeType === XMLReader::ELEMENT && $this->xmlReader->name === self::XML_NODE_ROW) {
+                } else if ($this->xmlReader->isPositionedOnStartingNode(self::XML_NODE_ROW)) {
                     // Start of the row description
                     $isInsideRowTag = true;
 
@@ -164,7 +165,7 @@ class RowIterator implements IteratorInterface
                     }
                     $rowData = ($numberOfColumnsForRow !== 0) ? array_fill(0, $numberOfColumnsForRow, '') : [];
 
-                } else if ($isInsideRowTag && $this->xmlReader->nodeType === XMLReader::ELEMENT && $this->xmlReader->name === self::XML_NODE_CELL) {
+                } else if ($isInsideRowTag && $this->xmlReader->isPositionedOnStartingNode(self::XML_NODE_CELL)) {
                     // Start of a cell description
                     $currentCellIndex = $this->xmlReader->getAttribute(self::XML_ATTRIBUTE_CELL_INDEX);
                     $currentColumnIndex = CellHelper::getColumnIndexFromCellIndex($currentCellIndex);
@@ -172,16 +173,17 @@ class RowIterator implements IteratorInterface
                     $node = $this->xmlReader->expand();
                     $rowData[$currentColumnIndex] = $this->getCellValue($node);
 
-                } else if ($this->xmlReader->nodeType === XMLReader::END_ELEMENT && $this->xmlReader->name === self::XML_NODE_ROW) {
+                } else if ($this->xmlReader->isPositionedOnEndingNode(self::XML_NODE_ROW)) {
                     // End of the row description
                     // If needed, we fill the empty cells
                     $rowData = ($this->numColumns !== 0) ? $rowData : CellHelper::fillMissingArrayIndexes($rowData);
                     $this->numReadRows++;
                     break;
 
-                } else if ($this->xmlReader->nodeType === XMLReader::END_ELEMENT && $this->xmlReader->name === self::XML_NODE_WORKSHEET) {
+                } else if ($this->xmlReader->isPositionedOnEndingNode(self::XML_NODE_WORKSHEET)) {
                     // The closing "</worksheet>" marks the end of the file
                     $this->hasReachedEndOfFile = true;
+                    break;
                 }
             }
 
@@ -192,6 +194,40 @@ class RowIterator implements IteratorInterface
         $this->rowDataBuffer = $rowData;
     }
 
+    /**
+     * Returns the (unescaped) correctly marshalled, cell value associated to the given XML node.
+     *
+     * @param \DOMNode $node
+     * @return string|int|float|bool|\DateTime|null The value associated with the cell (null when the cell has an error)
+     */
+    protected function getCellValue($node)
+    {
+        // Default cell type is "n"
+        $cellType = $node->getAttribute(self::XML_ATTRIBUTE_TYPE) ?: self::CELL_TYPE_NUMERIC;
+        $vNodeValue = $this->getVNodeValue($node);
+
+        if (($vNodeValue === '') && ($cellType !== self::CELL_TYPE_INLINE_STRING)) {
+            return $vNodeValue;
+        }
+
+        switch ($cellType) {
+            case self::CELL_TYPE_INLINE_STRING:
+                return $this->formatInlineStringCellValue($node);
+            case self::CELL_TYPE_SHARED_STRING:
+                return $this->formatSharedStringCellValue($vNodeValue);
+            case self::CELL_TYPE_STR:
+                return $this->formatStrCellValue($vNodeValue);
+            case self::CELL_TYPE_BOOLEAN:
+                return $this->formatBooleanCellValue($vNodeValue);
+            case self::CELL_TYPE_NUMERIC:
+                return $this->formatNumericCellValue($vNodeValue);
+            case self::CELL_TYPE_DATE:
+                return $this->formatDateCellValue($vNodeValue);
+            default:
+                return null;
+        }
+    }
+
     /**
      * Returns the cell's string value from a node's nested value node
      *
@@ -203,10 +239,7 @@ class RowIterator implements IteratorInterface
         // for cell types having a "v" tag containing the value.
         // if not, the returned value should be empty string.
         $vNode = $node->getElementsByTagName(self::XML_NODE_VALUE)->item(0);
-        if ($vNode !== null) {
-            return $vNode->nodeValue;
-        }
-        return "";
+        return ($vNode !== null) ? $vNode->nodeValue : '';
     }
 
     /**
@@ -296,40 +329,6 @@ class RowIterator implements IteratorInterface
         }
     }
 
-    /**
-     * Returns the (unescaped) correctly marshalled, cell value associated to the given XML node.
-     *
-     * @param \DOMNode $node
-     * @return string|int|float|bool|\DateTime|null The value associated with the cell (null when the cell has an error)
-     */
-    protected function getCellValue($node)
-    {
-        // Default cell type is "n"
-        $cellType = $node->getAttribute(self::XML_ATTRIBUTE_TYPE) ?: self::CELL_TYPE_NUMERIC;
-        $vNodeValue = $this->getVNodeValue($node);
-
-        if (($vNodeValue === '') && ($cellType !== self::CELL_TYPE_INLINE_STRING)) {
-            return $vNodeValue;
-        }
-
-        switch ($cellType) {
-            case self::CELL_TYPE_INLINE_STRING:
-                return $this->formatInlineStringCellValue($node);
-            case self::CELL_TYPE_SHARED_STRING:
-                return $this->formatSharedStringCellValue($vNodeValue);
-            case self::CELL_TYPE_STR:
-                return $this->formatStrCellValue($vNodeValue);
-            case self::CELL_TYPE_BOOLEAN:
-                return $this->formatBooleanCellValue($vNodeValue);
-            case self::CELL_TYPE_NUMERIC:
-                return $this->formatNumericCellValue($vNodeValue);
-            case self::CELL_TYPE_DATE:
-                return $this->formatDateCellValue($vNodeValue);
-            default:
-                return null;
-        }
-    }
-
     /**
      * Return the current element, from the buffer.
      * @link http://php.net/manual/en/iterator.current.php
diff --git a/src/Spout/Reader/XLSX/Sheet.php b/src/Spout/Reader/XLSX/Sheet.php
index 9510ecd..ce88212 100644
--- a/src/Spout/Reader/XLSX/Sheet.php
+++ b/src/Spout/Reader/XLSX/Sheet.php
@@ -15,9 +15,6 @@ class Sheet implements SheetInterface
     /** @var RowIterator To iterate over sheet's rows */
     protected $rowIterator;
 
-    /** @var int ID of the sheet */
-    protected $id;
-
     /** @var int Index of the sheet, based on order of creation (zero-based) */
     protected $index;
 
@@ -28,14 +25,12 @@ class Sheet implements SheetInterface
      * @param string $filePath Path of the XLSX file being read
      * @param string $sheetDataXMLFilePath Path of the sheet data XML file as in [Content_Types].xml
      * @param Helper\SharedStringsHelper Helper to work with shared strings
-     * @param int $sheetId ID of the sheet
      * @param int $sheetIndex Index of the sheet, based on order of creation (zero-based)
      * @param string $sheetName Name of the sheet
      */
-    public function __construct($filePath, $sheetDataXMLFilePath, $sharedStringsHelper, $sheetId, $sheetIndex, $sheetName)
+    public function __construct($filePath, $sheetDataXMLFilePath, $sharedStringsHelper, $sheetIndex, $sheetName)
     {
         $this->rowIterator = new RowIterator($filePath, $sheetDataXMLFilePath, $sharedStringsHelper);
-        $this->id = $sheetId;
         $this->index = $sheetIndex;
         $this->name = $sheetName;
     }
@@ -48,14 +43,6 @@ class Sheet implements SheetInterface
         return $this->rowIterator;
     }
 
-    /**
-     * @return int ID of the sheet
-     */
-    public function getId()
-    {
-        return $this->id;
-    }
-
     /**
      * @return int Index of the sheet, based on order of creation (zero-based)
      */
diff --git a/tests/Spout/Reader/ODS/ReaderTest.php b/tests/Spout/Reader/ODS/ReaderTest.php
new file mode 100644
index 0000000..81d808e
--- /dev/null
+++ b/tests/Spout/Reader/ODS/ReaderTest.php
@@ -0,0 +1,371 @@
+<?php
+
+namespace Box\Spout\Reader\ODS;
+
+use Box\Spout\Common\Exception\IOException;
+use Box\Spout\Common\Type;
+use Box\Spout\Reader\ReaderFactory;
+use Box\Spout\TestUsingResource;
+
+/**
+ * Class ReaderTest
+ *
+ * @package Box\Spout\Reader\ODS
+ */
+class ReaderTest extends \PHPUnit_Framework_TestCase
+{
+    use TestUsingResource;
+
+    /**
+     * @return array
+     */
+    public function dataProviderForTestReadShouldThrowException()
+    {
+        return [
+            ['/path/to/fake/file.ods'],
+            ['file_corrupted.ods'],
+        ];
+    }
+
+    /**
+     * @dataProvider dataProviderForTestReadShouldThrowException
+     * @expectedException \Box\Spout\Common\Exception\IOException
+     *
+     * @param string $filePath
+     * @return void
+     */
+    public function testReadShouldThrowException($filePath)
+    {
+        // using @ to prevent warnings/errors from being displayed
+        @$this->getAllRowsForFile($filePath);
+    }
+
+    /**
+     * @return array
+     */
+    public function dataProviderForTestReadForAllWorksheets()
+    {
+        return [
+            ['one_sheet_with_strings.ods', 2, 3],
+            ['two_sheets_with_strings.ods', 4, 3],
+        ];
+    }
+
+    /**
+     * @dataProvider dataProviderForTestReadForAllWorksheets
+     *
+     * @param string $resourceName
+     * @param int $expectedNumOfRows
+     * @param int $expectedNumOfCellsPerRow
+     * @return void
+     */
+    public function testReadForAllWorksheets($resourceName, $expectedNumOfRows, $expectedNumOfCellsPerRow)
+    {
+        $allRows = $this->getAllRowsForFile($resourceName);
+
+        $this->assertEquals($expectedNumOfRows, count($allRows), "There should be $expectedNumOfRows rows");
+        foreach ($allRows as $row) {
+            $this->assertEquals($expectedNumOfCellsPerRow, count($row), "There should be $expectedNumOfCellsPerRow cells for every row");
+        }
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldSupportRowWithOnlyOneCell()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_only_one_cell.ods');
+        $this->assertEquals([['foo']], $allRows);
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldSupportNumberColumnsRepeated()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_number_columns_repeated.ods');
+        $expectedRows = [
+            [
+                'foo', 'foo', 'foo',
+                '', '',
+                true, true,
+                10.43, 10.43, 10.43, 10.43,
+            ],
+        ];
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+    /**
+     * @return array
+     */
+    public function dataProviderForTestReadWithFilesGeneratedByExternalSoftwares()
+    {
+        return [
+            ['file_generated_by_libre_office.ods', true],
+            ['file_generated_by_excel_2010_windows.ods', false],
+            ['file_generated_by_excel_office_online.ods', false],
+        ];
+    }
+
+    /**
+     * @dataProvider dataProviderForTestReadWithFilesGeneratedByExternalSoftwares
+     * The files contain styles, different value types, gaps between cells,
+     * repeated values, empty row, different number of cells per row.
+     *
+     * @param bool $skipLastEmptyValues
+     * @param string $fileName
+     * @return void
+     */
+    public function testReadWithFilesGeneratedByExternalSoftwares($fileName, $skipLastEmptyValues)
+    {
+        $allRows = $this->getAllRowsForFile($fileName);
+
+        $expectedRows = [
+            ['header1','header2','header3','header4'],
+            ['val11','val12','val13','val14'],
+            ['val21','','val23','val23'],
+            ['', 10.43, 29.11],
+        ];
+
+        // In the description of the last cell, Excel specifies that the empty value needs to be repeated
+        // a lot of times (16384 - number of cells used in the row). To avoid creating 16384 cells all the time,
+        // this cell is skipped alltogether.
+        if ($skipLastEmptyValues) {
+            $expectedRows[3][] = '';
+        }
+
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+
+    /**
+     * @return void
+     */
+    public function testReadShouldSupportAllCellTypes()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_all_cell_types.ods');
+
+        $expectedRows = [
+            [
+                'ods--11', 'ods--12',
+                true, false,
+                0, 10.43,
+                '',
+            ],
+        ];
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldReturnEmptyStringOnUndefinedCellType()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_undefined_value_type.ods');
+        $this->assertEquals([['ods--11', '', 'ods--13']], $allRows);
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldSupportMultilineStrings()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_multiline_string.ods');
+
+        $expectedRows = [["string\non multiple\nlines!"]];
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldSkipEmptyRow()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_empty_row.ods');
+        $this->assertEquals(2, count($allRows), 'There should be only 2 rows, because the empty row is skipped');
+
+        $expectedRows = [
+            ['ods--11', 'ods--12', 'ods--13'],
+            // row skipped here
+            ['ods--21', 'ods--22', 'ods--23'],
+        ];
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldPreserveSpacing()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_various_spaces.ods');
+
+        $expectedRow = [
+            '    4 spaces before and after    ',
+            ' 1 space before and after ',
+            '2 spaces after  ',
+            '  2 spaces before',
+            "3 spaces   in the middle\nand 2 spaces  in the middle",
+        ];
+        $this->assertEquals([$expectedRow], $allRows);
+    }
+
+
+    /**
+     * @NOTE: The LIBXML_NOENT is used to ACTUALLY substitute entities (and should therefore not be used)
+     *
+     * @return void
+     */
+    public function testReadShouldBeProtectedAgainstBillionLaughAttack()
+    {
+        $startTime = microtime(true);
+        $fileName = 'attack_billion_laughs.ods';
+
+        try {
+            // using @ to prevent warnings/errors from being displayed
+            @$this->getAllRowsForFile($fileName);
+            $this->fail('An exception should have been thrown');
+        } catch (IOException $exception) {
+            $duration = microtime(true) - $startTime;
+            $this->assertLessThan(10, $duration, 'Entities should not be expanded and therefore take more than 10 seconds to be parsed.');
+
+            $expectedMaxMemoryUsage = 30 * 1024 * 1024; // 30MB
+            $this->assertLessThan($expectedMaxMemoryUsage, memory_get_peak_usage(true), 'Entities should not be expanded and therefore consume all the memory.');
+        }
+    }
+
+    /**
+     * @NOTE: The LIBXML_NOENT is used to ACTUALLY substitute entities (and should therefore not be used)
+     *
+     * @return void
+     */
+    public function testReadShouldBeProtectedAgainstQuadraticBlowupAttack()
+    {
+        $startTime = microtime(true);
+
+        $fileName = 'attack_quadratic_blowup.ods';
+        $allRows = $this->getAllRowsForFile($fileName);
+
+        $this->assertEquals('', $allRows[0][0], 'Entities should not have been expanded');
+
+        $duration = microtime(true) - $startTime;
+        $this->assertLessThan(10, $duration, 'Entities should not be expanded and therefore take more than 10 seconds to be parsed.');
+
+        $expectedMaxMemoryUsage = 30 * 1024 * 1024; // 30MB
+        $this->assertLessThan($expectedMaxMemoryUsage, memory_get_peak_usage(true), 'Entities should not be expanded and therefore consume all the memory.');
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldBeAbleToProcessEmptySheets()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_no_cells.ods');
+        $this->assertEquals([], $allRows, 'Sheet with no cells should be correctly processed.');
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadShouldSkipFormulas()
+    {
+        $allRows = $this->getAllRowsForFile('sheet_with_formulas.ods');
+
+        $expectedRows = [
+            ['val1', 'val2', 'total1', 'total2'],
+            [10, 20, 30, 21],
+            [11, 21, 32, 41],
+        ];
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+    /**
+     * @expectedException \Box\Spout\Reader\Exception\IteratorNotRewindableException
+     *
+     * @return void
+     */
+    public function testReadShouldThrowIfTryingToRewindRowIterator()
+    {
+        $resourcePath = $this->getResourcePath('one_sheet_with_strings.ods');
+        $reader = ReaderFactory::create(Type::ODS);
+        $reader->open($resourcePath);
+
+        foreach ($reader->getSheetIterator() as $sheet) {
+            // start looping throw the rows
+            foreach ($sheet->getRowIterator() as $row) {
+                break;
+            }
+
+            // this will rewind the row iterator
+            foreach ($sheet->getRowIterator() as $row) {
+                break;
+            }
+        }
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadMultipleTimesShouldRewindReader()
+    {
+        $allRows = [];
+        $resourcePath = $this->getResourcePath('two_sheets_with_strings.ods');
+
+        $reader = ReaderFactory::create(Type::ODS);
+        $reader->open($resourcePath);
+
+        foreach ($reader->getSheetIterator() as $sheet) {
+            // do nothing
+        }
+
+        // this loop should only add the first row of each sheet
+        foreach ($reader->getSheetIterator() as $sheet) {
+            foreach ($sheet->getRowIterator() as $row) {
+                $allRows[] = $row;
+                break;
+            }
+        }
+
+        // this loop should only add the first row of the first sheet
+        foreach ($reader->getSheetIterator() as $sheet) {
+            foreach ($sheet->getRowIterator() as $row) {
+                $allRows[] = $row;
+                break;
+            }
+
+            // stop reading more sheets
+            break;
+        }
+
+        $reader->close();
+
+        $expectedRows = [
+            ['ods--sheet1--11', 'ods--sheet1--12', 'ods--sheet1--13'], // 1st row, 1st sheet
+            ['ods--sheet2--11', 'ods--sheet2--12', 'ods--sheet2--13'], // 1st row, 2nd sheet
+            ['ods--sheet1--11', 'ods--sheet1--12', 'ods--sheet1--13'], // 1st row, 1st sheet
+        ];
+        $this->assertEquals($expectedRows, $allRows);
+    }
+
+    /**
+     * @param string $fileName
+     * @return array All the read rows the given file
+     */
+    private function getAllRowsForFile($fileName)
+    {
+        $allRows = [];
+        $resourcePath = $this->getResourcePath($fileName);
+
+        $reader = ReaderFactory::create(Type::ODS);
+        $reader->open($resourcePath);
+
+        foreach ($reader->getSheetIterator() as $sheetIndex => $sheet) {
+            foreach ($sheet->getRowIterator() as $rowIndex => $row) {
+                $allRows[] = $row;
+            }
+        }
+
+        $reader->close();
+
+        return $allRows;
+    }
+}
diff --git a/tests/Spout/Reader/XLSX/ReaderTest.php b/tests/Spout/Reader/XLSX/ReaderTest.php
index 1ec4290..eb42b84 100644
--- a/tests/Spout/Reader/XLSX/ReaderTest.php
+++ b/tests/Spout/Reader/XLSX/ReaderTest.php
@@ -173,12 +173,13 @@ class ReaderTest extends \PHPUnit_Framework_TestCase
      */
     public function testReadShouldSkipEmptyRows()
     {
-        $allRows = $this->getAllRowsForFile('sheet_with_empty_rows.xlsx');
+        $allRows = $this->getAllRowsForFile('sheet_with_empty_row.xlsx');
 
         $this->assertEquals(2, count($allRows), 'There should be only 2 rows, because the empty row is skipped');
 
         $expectedRows = [
             ['s1--A1', 's1--B1', 's1--C1', 's1--D1', 's1--E1'],
+            // skipped row here
             ['s1--A3', 's1--B3', 's1--C3', 's1--D3', 's1--E3'],
         ];
         $this->assertEquals($expectedRows, $allRows);
diff --git a/tests/Spout/Reader/XLSX/SheetTest.php b/tests/Spout/Reader/XLSX/SheetTest.php
index 8f3f9df..3464819 100644
--- a/tests/Spout/Reader/XLSX/SheetTest.php
+++ b/tests/Spout/Reader/XLSX/SheetTest.php
@@ -24,11 +24,9 @@ class SheetTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals('CustomName1', $sheets[0]->getName());
         $this->assertEquals(0, $sheets[0]->getIndex());
-        $this->assertEquals(1, $sheets[0]->getId());
 
         $this->assertEquals('CustomName2', $sheets[1]->getName());
         $this->assertEquals(1, $sheets[1]->getIndex());
-        $this->assertEquals(2, $sheets[1]->getId());
     }
 
     /**
diff --git a/tests/Spout/Writer/ODS/WriterTest.php b/tests/Spout/Writer/ODS/WriterTest.php
index 731e873..8146bb7 100644
--- a/tests/Spout/Writer/ODS/WriterTest.php
+++ b/tests/Spout/Writer/ODS/WriterTest.php
@@ -5,7 +5,6 @@ namespace Box\Spout\Writer\ODS;
 use Box\Spout\Common\Type;
 use Box\Spout\Reader\Wrapper\XMLReader;
 use Box\Spout\TestUsingResource;
-use Box\Spout\Writer\Style\StyleBuilder;
 use Box\Spout\Writer\WriterFactory;
 
 /**
diff --git a/tests/resources/ods/attack_billion_laughs.ods b/tests/resources/ods/attack_billion_laughs.ods
new file mode 100644
index 0000000..0c29831
Binary files /dev/null and b/tests/resources/ods/attack_billion_laughs.ods differ
diff --git a/tests/resources/ods/attack_quadratic_blowup.ods b/tests/resources/ods/attack_quadratic_blowup.ods
new file mode 100644
index 0000000..104ccd4
Binary files /dev/null and b/tests/resources/ods/attack_quadratic_blowup.ods differ
diff --git a/tests/resources/ods/file_corrupted.ods b/tests/resources/ods/file_corrupted.ods
new file mode 100644
index 0000000..bf012eb
Binary files /dev/null and b/tests/resources/ods/file_corrupted.ods differ
diff --git a/tests/resources/ods/file_generated_by_excel_2010_windows.ods b/tests/resources/ods/file_generated_by_excel_2010_windows.ods
new file mode 100755
index 0000000..955a465
Binary files /dev/null and b/tests/resources/ods/file_generated_by_excel_2010_windows.ods differ
diff --git a/tests/resources/ods/file_generated_by_excel_office_online.ods b/tests/resources/ods/file_generated_by_excel_office_online.ods
new file mode 100644
index 0000000..6c3f1f0
Binary files /dev/null and b/tests/resources/ods/file_generated_by_excel_office_online.ods differ
diff --git a/tests/resources/ods/file_generated_by_libre_office.ods b/tests/resources/ods/file_generated_by_libre_office.ods
new file mode 100644
index 0000000..dbc3f96
Binary files /dev/null and b/tests/resources/ods/file_generated_by_libre_office.ods differ
diff --git a/tests/resources/ods/one_sheet_with_strings.ods b/tests/resources/ods/one_sheet_with_strings.ods
new file mode 100644
index 0000000..c3df611
Binary files /dev/null and b/tests/resources/ods/one_sheet_with_strings.ods differ
diff --git a/tests/resources/ods/sheet_with_all_cell_types.ods b/tests/resources/ods/sheet_with_all_cell_types.ods
new file mode 100644
index 0000000..5843ac8
Binary files /dev/null and b/tests/resources/ods/sheet_with_all_cell_types.ods differ
diff --git a/tests/resources/ods/sheet_with_empty_row.ods b/tests/resources/ods/sheet_with_empty_row.ods
new file mode 100644
index 0000000..4763df0
Binary files /dev/null and b/tests/resources/ods/sheet_with_empty_row.ods differ
diff --git a/tests/resources/ods/sheet_with_formulas.ods b/tests/resources/ods/sheet_with_formulas.ods
new file mode 100644
index 0000000..a5bce1f
Binary files /dev/null and b/tests/resources/ods/sheet_with_formulas.ods differ
diff --git a/tests/resources/ods/sheet_with_multiline_string.ods b/tests/resources/ods/sheet_with_multiline_string.ods
new file mode 100644
index 0000000..6913c24
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