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A '''modeling language''' is any [[artificial language]] that can be used to express [[data]], [[information]] or [[knowledge]] or [[system]]s in a [[structure]] that is defined by a consistent set of rules. The rules are used for interpretation of the meaning of components in the structure of a [[programming language]].
A modeling language can be graphical or textual.<ref>{{Cite conference |last1=He |first1=Xiao |last2=Ma |first2=Zhiyi |last3=Shao |first3=Weizhong |last4=Li |first4=Ge |title=31st Annual International Computer Software and Applications Conference - Vol. 1- (COMPSAC 2007) |date=July 2007 |chapter=A metamodel for the notation of graphical modeling languages |chapter-url=https://ieeexplore.ieee.org/document/4291008 |volume=1 |pages=219–224 |doi=10.1109/COMPSAC.2007.27|isbn=978-0-7695-2870-0 |citeseerx=10.1.1.526.5321 }}</ref> A graphical modeling language uses a [[diagramming technique]] with named symbols that represent concepts and lines that connect the symbols and represent relationships and various other graphical notation to represent constraints. A textual modeling language may use standardized keywords accompanied by parameters or natural language terms and phrases to make computer-interpretable expressions. An example of a graphical modeling language and a corresponding textual modeling language is [[EXPRESS (data modeling language)|EXPRESS]].▼
▲A modeling language can be graphical or textual.<ref>{{Cite conference |last1=He |first1=Xiao |last2=Ma |first2=Zhiyi |last3=Shao |first3=Weizhong |last4=Li |first4=Ge |title=31st Annual International Computer Software and Applications Conference - Vol. 1- (COMPSAC 2007) |date=July 2007 |chapter=A metamodel for the notation of graphical modeling languages |chapter-url=https://ieeexplore.ieee.org/document/4291008 |volume=1 |pages=219–224 |doi=10.1109/COMPSAC.2007.27|isbn=978-0-7695-2870-0 |citeseerx=10.1.1.526.5321 }}</ref>
Not all modeling languages are executable, and for those that are, the use of them doesn't necessarily mean that programmers are no longer required. On the contrary, executable modeling languages are intended to amplify the productivity of skilled programmers, so that they can address more challenging problems, such as [[parallel computing]] and [[distributed system]]s.
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