Implementation for Invisible operators

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http://www.w3.org/TR/MathML2/chapter3.html

3.2.5.5 Invisible operators 
Certain operators that are "invisible" in traditional mathematical 
notation should be represented using specific entity references within mo 
elements, rather than simply by nothing. The entity references used for 
these "invisible operators" are: 

Full name Short name Examples of use 
⁢ ⁢ xy 
⁡ ⁡ f(x) sin x 
⁣ ⁣ m12 

The MathML representations of the examples in the above table are: 

<mrow>
  <mi> x </mi>
  <mo> &InvisibleTimes; </mo>
  <mi> y </mi>
</mrow>

<mrow>
  <mi> f </mi>
  <mo> &ApplyFunction; </mo>
  <mrow>
    <mo> ( </mo>
    <mi> x </mi>
    <mo> ) </mo>
  </mrow>
</mrow>

<mrow>
  <mi> sin </mi>
  <mo> &ApplyFunction; </mo>
  <mi> x </mi>
</mrow>

<msub>
  <mi> m </mi>
  <mrow>
    <mn> 1 </mn>
    <mo> &InvisibleComma; </mo>
    <mn> 2 </mn>
  </mrow>
</msub>

Original issue reported on code.google.com by ionel.alexandru@gmail.com on 19 Dec 2008 at 4:23

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Original comment by ionel.alexandru@gmail.com on 19 Dec 2008 at 4:26

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Original comment by ionel.alexandru@gmail.com on 11 Feb 2009 at 9:40

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