Using XML Schema for code autocomplete in my XML editor

I had a similar problem but did not find a solution here so I posted a similar question. The answer led me to the Eclipse XML Editors and Tools plugin in Eclipse which supports autocomplete based on XML Schema.

Once the XML document is associated with the relevant XSD file, autocomplete should kick in automatically.

p.s. Considering the date of your question, you probably already found a suitable solution. However I thought I'd leave this answer anyway as a heads up to future visitors. HTH.

Using XML Schema for code autocomplete is supported in Visual Studio more details here.

Alternative XML editor is: Microsoft XML Notepad 2007 (personally I found this editor to be very unfriendly, is very visual but editing files is not very productive)