XML has a special set of characters that cannot be used in normal XML strings.
These characters are:
- & - &
- < - <
- > - >
- " - "
- ' - '
For example, the following XML string is invalid:
<Organization>IBM & Microsoft</Organization>
Whereas the following is valid XML:
<Organization>IBM & Microsoft</Organization>
Note that we have replaced '&' with '&' in the second XML string which makes it valid.
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