xsd and wsdl incorrect file

How to fix corrupted xsd and wsdl files, is there any IDE which can suggest what is wrong? such as eclipse for java code when pressing CTRL + 1 , or where can I find books tutorials to understand formatting of these file types better? thank you

Here is concrete message error I have

[ERROR] 'item' is already defined
  line 223 of file:/C:/project/src/main/resources/schema.xsd

[ERROR] (related to above error) the first de开发者_开发百科finition appears here
  line 22 of file:/C:/project/src/main/resources/schema.xsd