static AttributeDict()
{
predefinedTokenDict.Add(new Attribute("text"));
predefinedTokenDict.Add(new Attribute("type"));
predefinedTokenDict.Add(new Attribute("line"));
predefinedTokenDict.Add(new Attribute("index"));
predefinedTokenDict.Add(new Attribute("pos"));
predefinedTokenDict.Add(new Attribute("channel"));
predefinedTokenDict.Add(new Attribute("int"));
}