Apache doesn't return xml content correctly

[Smith]

I have a problem about xml with apache. It didn't return the updated / modified xml correctly in second request. I have xml file like this: \[code\]<?xml version="1.0" encoding="UTF-8" standalone="yes"?><?aid style="50" type="snippet" eaderVersion="6.0" featureSet="257" product="7.5(142)" ?><?sometag SnippetType="Something"?<Document> <TestingNode>content content - a b- </TestingNode></Document>\[/code\]it return good xml format, Then i edit content manually or by some lines of code But the result is not updated.I turned off apache's cache modules But it return same results - nothing updated. some time it return the previous content of that file, but only half of it... But when i rename the file and try to request with new file name, it's ok. I think there are something relate to the cache, but I don't know how to fix this.xml file is requested directly, no alias, no .htaccess, no any script in the middle.Anybody resolved this problem ? could any body help?