Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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JIRA 3.1 and above should not suffer from this problem. Invalid characters are automatically stripped from imported data
In older versions of JIRA it was possible to cut & paste text containing control characters into JIRA issue fields. This causes problems, because JIRA's backup format is XML, and XML does not allow for the storage of most control characters .When XML containing control characters is imported into JIRA, the import fails with an error:
To fix this, the control characters will need to be removed from the JIRA backup file. This can be done with the following:
entities.xml を使います。Run the application with the below:
$ java -jar atlassian-xml-cleaner-0.1.jar entities.xml > entities-clean.xml
This will create a copy of entities.xml as entities-clean.xml with the invalid characters removed. The entities-clean.xml will be able to be imported without the above errors now.