如何从R studio中创建一个从XML中提取的数据框的等值线图

(totally new to R) I have downloaded an XML file to use in R to create a choropleth map from the data. I am using US flu data. From my research I understand that I needed to make that XML file a data frame for R to read. So I have done that. When I view my data frame I get all the XML formatting with it. The question I have is how do I take the information that I need and extract it to create a map? At this point I am getting errors on even plotting the data. I have looked high and low for this information and I haven't found it as of yet. (totally new to R) I have downloaded an XML fil