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# XML Cheatsheet

## Unique Features
- Markup language for creating structured documents
- Self-describing data format
- Supports user-defined tags
- Hierarchical structure with parent-child relationships
- Widely used in web development and data exchange

## Elements

<element_name attribute_name="attribute_value">

Element content

</element_name>

## Attributes

<element_name attribute_name="attribute_value">

Element content

</element_name>

## Comments

<!-- Comment text -->

## Processing Instructions

<?instruction_name instruction_data?>

## Entities

<!ENTITY entity_name "entity_value">

## Namespaces

<namespace_prefix:element_name xmlns:namespace_prefix="namespace_URI">

Element content

</namespace_prefix:element_name>

## Document Type Definition (DTD)

<!DOCTYPE root_element_name [

<!ELEMENT element_name (child_element_name)>

<!ATTLIST element_name attribute_name attribute_type "default_value">

]>

## Resources
- [XML Tutorial](https://www.w3schools.com/xml/)
- [XML in a Nutshell](https://www.oreilly.com/library/view/xml-in-a/0596007647/) (book)
- [XML Validator](https://www.xmlvalidation.com/)
- [XML Editors](https://xml-editors.github.io/) (list of XML editors)