xml attribute not well-formed? -


simple question. if attempt at

<?xml version='1.0'?> <test key="blah('foo=1&bar=2')"> </test>

in firefox, complains 

xml parsing error: not well-formed location: file:///c:/tmp/dump2.xml line number 2, column 27:  <test key="blah('foo=1&bar=2')"> --------------------------^

why this? need escape?

<?xml version='1.0'?> <test key="blah('foo=1&bar=2')"> </test>

is not well-formed xml. use:

<?xml version='1.0'?> <test key="blah('foo=1&amp;bar=2')"> </test>

edit:

error message in oxygen xml editor:

f [xerces] reference entity "bar" must end ';' delimiter.

that means &bar parsed entity reference, here syntax error, is, missing ;. need escape & character using predefined entity (one of five) &amp;.


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