How do you nest complexType elements in an xsd?

I have an xml and xsd file that both validate correctly (tested at http://xsdvalidation.utilities-online.info/). However, the xml does not validate against the xsd. I think this is because I am incorrectly nesting complexType elements in the xsd, as compared to the xml. The outer element of `people` seems to be causing the problem... Here is the xml: ``` <?xml version = "1.0"?> <people> <person> <firstname>Joe</firstname> <lastname>Schmoe</lastname> </person> <person> <firstname>Cletus</firstname> <lastname>Jenkins</lastname> </person> </people> ``` ...and here is the xsd: ``` <?xml version = "1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name = "people"> <xs:complexType> <xs:sequence> <xs:element name = "person"> <xs:complexType> <xs:sequence> <xs:element name = "firstname" type = "xs:string" /> <xs:element name = "lastname" type = "xs:string" /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> ```