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How do I get at the value of the "level" attribute?

I am using JavaScript to display search results from an XML file to an HTML file (using .innerHTML). I have no problem accessing any element I want, but I cannot seem to get at the attributes (e.g., <objective level="1"> content here</objective>). How do I get at the value of the "level" attribute?
innerHTML will return a string. This string can be used to create a DOM. From there, the methods to access elements and attributes are per the DOM specifications. In particular, if you have an Element object you can use the getAttribute() method to retrieve an attribute value.

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