It would help if you list the version of vROPs that you are using.
With vROPs 8.1 (which is all I have access to in my lab), you can export alerts and symptoms as XML from within the vROPs GUI.
You could also use PowerShell to export this information as a CSV by using the vROPs PowerCLI module;
After connecting to the vROPs server (connect-omserver) run the following (where path to filename is the file you want to save for example c:\definitions.csv);
For Alert Definitions
Get-OMAlertDefinition | ConvertTo-CSV | Out-File pathtofilename.csv
For Symptom Definitions it's a little more complicated, but not much. First create a variable to your vROPs server;
$vrops = connect-omserver servername - user username -password password
then use that variable to pull the information from the vROPs API;
$vrops.ExtensionData.GetSymptomDefinitions().symptomdefinition | ConvertTo-CSV | Out-File pathtofilename.csv
Hope this helps