# MathML Input Processor Options¶

The options below control the operation of the MathML input processor that is run when you include 'input/mathml' in the load array of the loader block of your MathJax configuration, or if you load a combined component that includes the MathML input jax. They are listed with their default values. To set any of these options, include an mml section in your MathJax global object.

## The Configuration Block¶

MathJax = {
mml: {
parseAs: 'html',                     // or 'xml'
forceReparse: false,                 // true to serialize and re-parse all MathML
parseError: function (node) {        // function to process parsing errors
}
}
};


## Option Descriptions¶

parseAs: 'html'

Specifies how MathML strings should be parsed: as XML or as HTML. When set to 'xml', the browser’s XML parser is used, which is more strict about format (e.g., matching end tags) than the HTML parser, which is the default. In node application (where the liteDOM is used), these both use the same parser, which is not very strict.

forceReparse: false

Specifies whether MathJax will serialize and re-parse MathML found in the document. This can be useful if you want to do XML parsing of the MathML from an HTML document.

parseError: (node) => {...}

Specifies a function to be called when there is a parsing error in the MathML (usually only happens with XML parsing). The node is a DOM node containing the error text. Your function can process that in any way it sees fit. The default is to call the MathML input processor’s error function with the text of the error (which will create an merror node with the error message). Note that this function runs with this being the MathML input processor object.

## Developer Options¶

In addition to the options listed above, low-level options intended for developers include the following:

FindMathML: null

The FindMathML object instance that will override the default one. This allows you to create a subclass of FindMathML and pass that to the MathML input jax. A null value means use the default FindMathML class and make a new instance of that.

MathMLCompile: null

The MathMLCompile object instance that will override the default one. This allows you to create a subclass of MathMLCompile and pass that to the MathML input jax. A null value means use the default MathMLCompile class and make a new instance of that.