CDATA sections – PB Docs 2017

You can export the name of a column in a CDATA section using the
syntax <![CDATA[columnname]]>. You can export the value of a
column using the syntax <![CDATA[~t columnname]]>. The ~t is
used to introduce a DataWindow expression, in the same way that it is
used in the Modify method. You can also use an expression such as ~t
columnname*columnname to export a computed value to the XML.

You can import a value into a column using the syntax
<![CDATA[ columnname]]>. Note that this syntax in a template has
different results for import and export: it imports the column value
but exports the column name.

You cannot import an XML file that has a ~t expression in a
CDATA section.

Everything else inside a CDATA section is ignored by the parser.
If text contains characters such as less than or greater than signs
(< or >) or ampersands (&) that are significant to the
parser, it should be defined as a CDATA section. A CDATA section
starts with <![CDATA[ and ends with ]]>. CDATA sections cannot
be nested, and there can be no white space characters inside the
]]> delimiter—for example, you cannot put a space between the two
square brackets.

Example

This syntax in an export template exports the value of the
column emp_salary:

This syntax in an import template imports the value of the
column emp_salary: