Allows to store data as content of the provided noe to be enclosed as CDATA. Some characters are not allowed to be stored "as is" inside a parseable XML document. The basic set of them are: &, ', ", < or >. In order to store content containing previous characters inside an xml node, and to remain valid, functions like axl_node_set_content will translate those value, into the accepted scape sequences. However, in the other hand, the entity parsing the document produced must perform the translation back to the normal state. As an alternative, the XML node content could be stored enclosed as a CDATA section: <![CDATA[..]]> allow to store "un-parsed" characters, including those not allowed.
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