Let us take look of how XML tags are case sensitive.

• Unlike HTML, XML tags are case sensitive.

• With XML, the tag is different from the tag .

• Opening and closing tags must therefore be written with the same case:

• This is incorrect

• This is correct

All XML elements must be properly nested

Improper nesting of tags makes no sense to XML.
In HTML some elements can be improperly nested within each other like this:
This text is bold and italic
In XML all elements must be properly nested within each other like this:
This text is bold and italic

All XML documents must have a root element

• All XML documents must contain a single tag pair to define a root element.

• All other elements must be within this root element.

• All elements can have sub elements (child elements). Sub elements must be correctly nested within their parent element:


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