The ' ' character, hexadecimal value 0x20, cannot be included in a name.

An XmlElement is something that look a bit like "" in
XML. If it has a space, then it won't be an element any more, because
that would make it look like "", and the 'thing' would look
like the start of an attribute.

So, either you need to rule out spaces, or you need to devise some
escaping mechanism to substitute the spaces with some other characters.