} else if(tag.equals(MathExpressionConstSetStringValue.TAG)) {
express = new MathExpressionConstSetStringValue(element,
cf.getChildContext(MathExpressionConstSetStringValue.GROUP));
} else if(tag.equals(MathExpressionEmphases.TAG)) {
express = new MathExpressionEmphases(element,
cf.getChildContext(MathExpressionEmphases.GROUP));
} else if(tag.equals(MathExpressionEntityFieldRef.TAG)) {
express = new MathExpressionEntityFieldRef(element,
cf.getChildContext(MathExpressionEntityFieldRef.GROUP));