How to escape double quotes in XML attributes values?

Question

From the following trials

<tag attr="\"">
<tag attr="<![CDATA["]]>">
<tag attr='"'>

Only the last one works for a XML parser that I'm using here. Is there any other alternative?

Answer 1

You can use "

Answer 2

From the XML spec:

To allow attribute values to contain both single and double quotes, the apostrophe or single-quote character (') may be represented as "'", and the double-quote character (") as """.