public void setSourceText(String sourceText) {
		if( !sourceText.equals(AlchemyAPI_CategoryParams.CLEANED_OR_RAW) 
				&& !sourceText.equals(AlchemyAPI_CategoryParams.CQUERY)
				&& !sourceText.equals(AlchemyAPI_CategoryParams.XPATH))
		{
			throw new RuntimeException("Invalid setting " + sourceText + " for parameter sourceText");
		}
		this.sourceText = sourceText;
	}