Introduction Comments
A comment block in XML starts with <!-- and ends with -->. Everything can go inside a comment block, except the -- sequence, for compatibility with older format specifications (SGML).

### Good:

    <!--comment--> no spaces needed between comment symbols and text

    <!--
    comment --> comments can be spawn over multiple lines

### Bad:

    < !-- comment --> left comment symbol has a space in the middle

    <-- comment --> left comment symbol misses a ! character

    <!-- -- comment --> comment has a -- sequence

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