Returns the XPath expression contained in a DFDL expression (an XPath expression surrounded by brackets).
Returns the XPath expression contained in a DFDL expression (an XPath expression surrounded by brackets).
a valid DFDL expression
Whether a string is a DFDL expression (an XPath expression surrounded by brackets).
Whether a string is a DFDL expression (an XPath expression surrounded by brackets).
This function does not verify a string conforms to the DFDL subset of XPath