// reading of provinces map
// TODO if no such element returns null and getValue will throw exception
content = child.getFirstChild("Provinces").getValue();
BitBuffer probuffer = BitBuffer.fromXMLString(content);
probuffer.trimTo(BITSIZE_PROVINCEID * size);
// reading of railroads map
content = child.getFirstChild("Railroads").getValue();
BitBuffer railbuffer = BitBuffer.fromXMLString(content);
railbuffer.trimTo(BITSIZE_RAILROAD_CONFIG * size);