I have the xml file relating to a Geocortex Essentials site, from which I'm attempting to extract elements as FME features. However, I can't even get beyond parameters > elements to match, as I get this error: 
It seems to infer a format error? (I'm entirely new to XML, btw), but this site is functioning ok. Any ideas? Many thanks
Page 1 / 1
What happens when you validate the XML using the XMLValidator? Initiate using a Creator and point directly to the file.
Not sure what issue you have but I read XML as "Text File" (Read Whole File at Once = Yes) and then use XML Fragmenters / XMLFlatteners to do what I need.
Just checked a Site.xml I had laying around but I can't reproduce your issue. I have had failing XMLUpdaters in the past, caused by the curly brackets of placeholders in Geocortex Essentials.