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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)