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+# Scripting Excel Spreadsheets using Epsilon
+
+Epsilon provides built-in support for querying and transforming Excel spreadsheets through an [Apache POI](https://poi.apache.org/)-based [EMC](../../emc) driver. The video below demonstrates the Excel driver in action.
+
+<iframe width="100%" height="494" src="https://www.youtube.com/embed/tTYGwgzxPMM" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+??? info "Citing the spreadsheet driver in a publication?"
+	If you are referring to Epsilon's spreadsheet driver in a publication, please cite [this paper](https://link.springer.com/chapter/10.1007/978-3-642-41533-3_3) instead of the website URL.
+
+## Worksheets, Columns and Rows
+
+Essentially, in the Excel driver, by default, worksheets are treated as model element types (e.g. `Student`, `Staff`, `Module` and `Mark` in the spreadsheet below), columns as their properties (e.g. `Mark` has `student`, `module` and `mark` properties), and rows are treated as model elements (i.e. there are two students, two members of staff, three modules and two marks in the model).
+
+![](spreadsheet.png)
+
+## References and Column Types
+
+The driver supports specifying additional configuration information (e.g. column data types, references between columns) about a spreadsheet in the form of an external XML document, that can be attached to the spreadsheet in Epsilon's run configuration dialog.
+
+For our example spreadsheet, above, the configuration file below specifies the types of the `age` and `mark` columns of the spreadsheet, the multiplicity of the `teaches` column, as well as references between the `Student.supervisor` and `Staff.id`, and the `Staff.teaches` and `Module.id` columns.
+
+```xml
+<spreadsheet>
+  <worksheet name="Student">
+    <column name="age" datatype="integer"/>
+  </worksheet>
+  <worksheet name="Mark">
+  	<column name="mark" datatype="integer"/>
+  </worksheet>
+  <worksheet name="Staff">
+  	<column name="teaches" many="true" delimiter=","/>
+  </worksheet>
+  <reference source="Student->supervisor"
+             target="Staff->id"/>
+  <reference source="Staff->teaches"
+             target="Module->id" many="true"/>
+</spreadsheet>
+```
+
+The format of the XML configuration document is as follows:
+
+### Worksheet
+Each worksheet can have an optional name (if a name is not provided, the name of the worksheet on the spreadsheet is used) and acts as a container for `column` elements.
+
+### Column
+Each `column` needs to specify its `index` in the context of the worksheet it belongs to, and optionally, a `name` (if a name is not provided, the one specified in its first cell is used as discussed above), an `alias`, a `datatype`, a `cardinality`, and in case of columns with unbounded cardinality, the `delimiter` that should be used to separate the values stored in a single cell (comma is used as the default delimiter).
+
+### Reference
+In a configuration document we can also specify ID-based references to capture relationships between columns belonging to potentially different worksheets. Each reference has a `source` and a `target` column, an optional `name` (if a name is not specified, the name of the source column is used to navigate the reference), a cardinality (`many` attribute), and specifies whether updates to cells of the target column should be propagated automatically (`cascadeUpdates` attribute) to the respective cells in the source column to preserve referential integrity.
+
+## Querying and Modifying Spreadsheets
+
+Having specified the configuration document above, we can now query spreadsheet with EOL as follows.
+
+```eol
+// Returns all students called Thomas
+Student.all.select(s|s.supervisor.firstname = "Thomas");
+
+// Returns the module taught by Daniel
+Module.all->select(m|
+	Staff.all.exists(s|
+		s.firstname="Daniel" and s.teaches->includes(m)))
+```
+
+### Creating Rows
+
+As discussed above, worksheets are treated as types and rows as their instances. As such, to create a new row in the `Student` worksheet, EOL's `new` operation can be used.
+
+```eol
+var student : new Student;
+```
+
+### Deleting Rows
+
+To delete a row from a worksheet, EOL's `delete` operator can be used. When a row is deleted, all the rows that contain cells referring to it through cascade-update references also need to be recursively deleted.
+
+```eol
+var student = Student.all.selectOne(s|s.id = "js502");
+// deletes row 2 of the Student worksheet
+// also deletes row 3 of the Mark worksheet
+delete student;
+```
+
+### Modifying Cell Values
+
+If a cell is single-valued, a type-conforming assignment can be used to edit its value. For example, the following listing demonstrates modifying the age and the supervisor of a particular student.
+
+```eol
+var student : Student = ...;
+var supervisor : Staff = ...;
+student.age = 24;
+student.supervisor = supervisor;
+```
+
+If on the other hand the cell is multi-valued, then its values should be handled as a collection. For example to move a module between two members of staff, the module row would need to be retrieved first, so that it can be removed/added from/to the `teaches` collections of the appropriate members of staff.
+
+```eol
+// Moves a module between two members of staff
+var from : Staff = ...;
+var to : Staff = ...;
+var module : Module = ...;
+from.teaches.remove(module);
+to.teaches.add(module);
+```
+
+Updating the value of a cell can have side effects to other cells that are linked to it through cascade-update references to preserve referential integrity. For example, updating the value of cell A3 in the `Module` worksheet, should trigger appropriate updates in cells D2 and F2 of the `Staff` and `Student` worksheets respectively.
+
+## Validating and Transforming Spreadsheets
+
+Of course, we can also validate spreadsheets using [EVL](../../evl), transform them into other models using [ETL](../../etl), and into text using [EGL](../../egl), generate graphical views using [Picto](../../picto) etc.
+
+```evl
+context Staff {
+	constraint NotOverloaded {
+		check: self.teaches.size() <= 4
+		message: "Member of staff" + self.firstname +
+		  " " + self.lastname + " is overloaded"
+	}
+}
+```
\ No newline at end of file
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 ## Epsilon and other types of models
 
-- [Scripting XML documents using Epsilon](plain-xml): In this article we demonstrate how you can create, query and modify plain standalone XML documents (i.e. no XSD/DTD needed)  in Epsilon programs using the  PlainXML driver.
+- [Scripting XML documents using Epsilon](plain-xml): In this article we demonstrate how you can create, query and modify plain standalone XML documents (i.e. no XSD/DTD needed) in Epsilon programs using the PlainXML driver.
 - [Scripting CSV files using Epsilon](csv-emc): This article demonstrates how you can query CSV files with Epsilon programs using the CSV driver.
+- [Scripting Excel spreadsheets using Epsilon](excel): In this article we demonstrate how you can create, query and modify Excel spreadsheets in Epsilon programs.
 - [Scripting BibTeX files using Epsilon](bibtex): In this article we demonstrate how you can query a list of references stored in BibTeX files with Epsilon programs using the BibTeX driver.
 
 ## Eugenia
diff --git a/mkdocs/docs/doc/emc.md b/mkdocs/docs/doc/emc.md
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+++ b/mkdocs/docs/doc/emc.md
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 Epsilon also provides mature support for querying and modifying Matlab Simulink models as shown in [these articles](../articles/#epsilon-and-simulink-models).
 
-### XML/CSV
+### XML/CSV/Excel
 
-For quick and dirty metamodel-less modelling, Epsilon also supports [plain XML documents](../articles/plain-xml) and [CSV files](../articles/csv-emc).
+For quick and dirty metamodel-less modelling, Epsilon also supports [plain XML documents](../articles/plain-xml), [Excel spreadsheets](../articles/excel), and [CSV files](../articles/csv-emc).
 
 ### Eclipse Hawk