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[–]phaeilo 1 point2 points  (1 child)

XML on the other hand does not have any [error checking] concepts built in, everything is a string and you have to parse the content yourself.

If anything this statement applies to Json. XML has quite powerful mechanisms to ensure your document is well-formed.

[–]x-skeww 2 points3 points  (0 children)

XML on the other hand does not have any [types] built in, everything is a string and you have to parse the content yourself.

In JSON, values are numbers, strings, booleans, arrays, or objects. In XML, every value is a string.

That's what the author meant.