Question for Mikalai Zaikin's Study Guide

[Silvio Esser]

I got this from Example 5 and 4 of http://www.w3.org/TR/wsdl#A4.1

<message name="GetTradePricesInput">
<part name="tickerSymbol" element="xsd:string"/>
<part name="timePeriod" element="xsd1:TimePeriod"/>
</message>

But Mikalai stated following in the Study Guide:

INCORRECT (xsd:string is not a global element):
<message name="GetTradePriceInput">
<part name="tickerSymbol" element="xsd:string"/>
<part name="time" element="xsd:timeInstant"/>
</message>
INCORRECT (xsd:string is not a global element):
<message name="GetTradePriceInput">
<part name="tickerSymbol" element="xsd:string"/>
</message>

Mikialai, Could you explain? Thanks

[ram nagab]

As I know it should be "type" instead of "element"