Improperly handles greater-than within tag attribute

[stevendesu]

I have the following XML:

<library>
    <book title="...">
        <author>...</author>
        <release-date>...</release-date>
        ...
    </book>
    <book title="...">
        ...
    </book>
</library>

This worked fine until I add a book with a great-than symbol in the name:

    <book title="3 > 2">
        <author>Mathematics</author>
        ...
    </book>

This turned into:

    <book title="3 >
        2">

        <author>Mathematics</author>
        ...
    </book>

I assume a regular expression is being used to detect tags and it's getting tripped up.

Per the RFC this is valid (although an ampersand or a less-than symbol is not valid): https://www.w3.org/TR/xml/#d0e888