ExpressionML (.xml)
Background & Context

-
- MIME type: text/xmlWolfram Language ExpressionML format.
- Represents an arbitrary Wolfram Language expression as XML.
- Used for the exchange of general expressions between the Wolfram System and other applications.
- Plain text file, normally encoded as UTF-8.
- Developed in 2002 by Wolfram Research.
Import & Export


- Import["file.xml"] imports an ExpressionML file and returns an expression.
- Export["file.xml",expr,"ExpressionML"] exports an arbitrary expression to XML.
- Import["file.xml"] reads an XML file that holds ExpressionML data and converts it to the corresponding Wolfram Language expression.
- When reading XML, Import automatically recognizes the ExpressionML format. Generic XML content will be imported as an XMLObject expression.
- Export["file.xml",expr,"ExpressionML"] converts an arbitrary Wolfram Language expression to the corresponding ExpressionML data structure and writes it to an XML file.
- Export["file.xml",XMLObject[…]] converts a symbolic XML expression to generic XML.
- Import["file.xml",elem] imports the specified element from an ExpressionML file.
- Import["file.xml",{{elem1,elem2,…}}] imports multiple elements.
- The import format can be specified with Import["file","ExpressionML"] or Import["file",{"ExpressionML",elem,…}].
- Export["file.xml",expr,elem] creates an ExpressionML file by treating expr as specifying element elem.
- Export["file.xml",{expr1,expr2,…},{{elem1,elem2,…}}] treats each expri as specifying the corresponding elemi.
- Export["file.xml",expr,opt1->val1,…] exports expr with the specified option elements taken to have the specified values.
- Export["file.xml",{elem1->expr1,elem2->expr2,…},"Rules"] uses rules to specify the elements to be exported.
- The export format can be explicitly specified in the form Export["file",expr,"ExpressionML"] or Export["file",expr,{"ExpressionML",elems}].
- See the reference pages for full general information on Import and Export.
- ImportString and ExportString support the ExpressionML format.
Import Elements

- General Import elements:
-
"Elements" list of elements and options available in this file "Rules" full list of rules for each element and option "Options" list of rules for options, properties, and settings - Data representation elements:
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"Boxes" ExpressionML typeset as a Wolfram Language box expression "Expression" arbitrary Wolfram Language expression "HeldExpression" unevaluated expression "XMLObject" ExpressionML as a symbolic XML expression "XMLElement" nested XMLElement objects - Import and Export use the "Expression" element by default.
Examples
Basic Examples (1)
Convert a mathematical expression to the ExpressionML format:
Import automatically recognizes the ExpressionML format when reading XML data:
Show the available Import elements:
Convert ExpressionML to an evaluated expression:
Convert ExpressionML to a Wolfram Language typesetting expression: