File formats related to XML

• XML (EXtensible Markup Language) is a format optimized to transport data with a given hierarchical structure. It can be seen as a tree containing elements. Those elements can contain child elements, data, and parameters. Each parameter contains one piece of information about the element.
  
• XSD (XML Schema Definition) is a file used as a schema for an XML file. It defines the elements and attributes which can be used, their hierarchy, data types, and can also define fixed values.
  
• AXM is used in AIMMS as a mapping file. It specifies links between the XML elements and AIMMS objects.
  

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