<<
The size of VARCHAR is ‘unlimited’, that’s why XML data is exported as CDATA, 
which is allowed in XML.
If you import this kind of data it should work correctly, but in that case you 
are dependent of the receiving software.
If you like to avoid this situation you better make use of a TEXT column. The 
limit in that case is 1500 characters. In this situation the text field is 
exported in a normal (readable) way
>>

CDATA is not related to the length of the enclosed text, but rather the 
contents.  CDATA can contain characters that structure XML and that cannot, 
normally, be included in an XML file with special encoding (for instance, it's 
the only way to embed a piece of non-encoded HTML into an XML document).  I'm 
not sure why the CDATA section in this case is Base64 encoded since that would 
seem to be necessary only for a standard XML element (where the Base64 encoding 
would eliminate not only any non-ASCII characters but also the problematic 
symbols <, >, and &.

--
Larry

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