xml.getELementsByTagName is not a function

Making Packs
1

I am building a Pack which retrieves XML data from an API

Most of the Pack is working. However I am able to parse the XML contents using Javascript in my local test environment but that does not work within the Pack.

This is the pertinent code

var xml = response.body;

var abstract = xml.getElementsByTagName('AbstractText')[0].innerHTML;

When I try to use this code in my Pack I get this error:

xml.getELementsByTagName is not a function

How do I fix this?