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MathML
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== Other standards == Another standard called [[OpenMath]] that has been more specifically designed (largely by the same people who devised Content MathML) for storing formulae semantically can be used to complement MathML. OpenMath data can be embedded in MathML using the {{code|lang=XML|1=<annotation-xml encoding="OpenMath">}} element. OpenMath ''content dictionaries'' can be used to define the meaning of {{code|lang=XML|<csymbol>}} elements. The following would define ''P''<sub>1</sub>(''x'') to be the first [[Legendre polynomial]]: <syntaxhighlight lang="xml"> <apply> <csymbol encoding="OpenMath" definitionURL="http://www.openmath.org/cd/contrib/cd/orthpoly1.xhtml#legendreP"> <msub><mi>P</mi><mn>1</mn></msub> </csymbol> <ci>x</ci> </apply> </syntaxhighlight> The [[OMDoc]] format has been created for markup of larger mathematical structures than formulae, from statements like definitions, theorems, proofs, and examples, to complete theories and even entire text books. Formulae in OMDoc documents can either be written in Content MathML or in OpenMath; for presentation, they are converted to Presentation MathML. The [[International Organization for Standardization|ISO]]/[[International Electrotechnical Commission|IEC]] standard [[Office Open XML]] (OOXML) defines a different XML math syntax, derived from [[Microsoft Office]] products. However, it is partially compatible<ref>{{cite web | url = https://dpcarlisle.blogspot.com/2007/04/xhtml-and-mathml-from-office-20007.html | title = XHTML and MathML from Office 2007 | first = David | last = Carlisle | publisher = [[Blogspot]] | publication-date = 2007-04-10 | access-date = 2007-09-20 }}</ref> through [[XSL Transformations]].
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