XML names are case sensitive. The following two elements are different
for XML. The first one is a “tel” element whereas the second one is a “TEL”
element:
<tel>513-555-7098</tel>
<TEL>513-555-7098</TEL>
Apopular variation on this error is to use a different case in the opening
and closing tag of an element:
<tel>513-555-7098</TEL>
Introduce Spaces in the Name of Element
It is illegal to introduce spaces in the name of elements. The XML processor
interprets spaces as the beginning of an attribute. The following example is
not valid because
address bookhas a space in it:
<address book>
<entry>
<name>John Doe</name>
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