Parsing: HTML comments

[skalee]

Following definitions include HTML comments in definitions:

• 112-01-32
• 212-11-28
• 212-14-16
• 212-18-03
• 212-18-04

For example, this one in 112-01-32 (<!-- is by definition equal to -->):

mathematical relation between base units, coherent derived units or other units of measurement
<p>NOTE    For the quantities <i>Q</i><sub>1</sub>, <i>Q</i><sub>2</sub>, and <i>Q</i><sub>3</sub> related by the quantity equation <i>Q</i><sub>1</sub> = <i>&zeta;</i> <i>Q</i><sub>2</sub> <i>Q</i><sub>3</sub>, the unit equation is &lsqb;<i>Q</i><sub>1</sub>&rsqb; = &lsqb;<i>Q</i><sub>2</sub>&rsqb; &lsqb;<i>Q</i><sub>3</sub>&rsqb;, where &lsqb;<i>Q</i><sub>1</sub>&rsqb;, &lsqb;<i>Q</i><sub>2</sub>&rsqb;, and &lsqb;<i>Q</i><sub>3</sub>&rsqb; denote the units of <i>Q</i><sub>1</sub>, <i>Q</i><sub>2</sub>, and <i>Q</i><sub>3</sub>, respectively, provided that these units are in a coherent system of units.   <p>Examples:
<ul>
<li>J :=<!-- is by definition equal to --> kg m<sup>2</sup> s<sup>&minus;2</sup>, where J, kg, m, and s are the symbols for the joule, kilogram, metre, and second, respectively (the symbol :=<!is by definition equal to> denotes “is by definition equal to”); </li>
<li>1 km/h = (1/3,6) m/s.</li>
</ul>

Or this one in 212-14-16:

the number of anhydrous-<!-->&beta;<!-->-glucose monomers, C<sub>6</sub>H<sub>10</sub>O<sub>5</sub>, in the cellulose molecule

@ronaldtse Is it any important to preserve them?