* @return
*/
private String getPrefix(int relativePosition, String elText) {
java.io.StringReader reader = new java.io.StringReader(elText);
JSPELParserTokenManager scanner = new JSPELParserTokenManager(
new SimpleCharStream(reader, 1, 1));
Token curToken = null, lastIdentifier = null;
while (JSPELParserConstants.EOF != (curToken = scanner.getNextToken()).kind) {
if (JSPELParserConstants.COLON == curToken.kind
&& curToken.endColumn == relativePosition
&& null != lastIdentifier) {