[Cosmo-dev] dealing with characters that XML 1.0 doesn't allow

[Morgen Sagen]

Yesterday we had our first instance of Chandler sending a character  
not supported by XML to Cosmo, in this case an 0x0c (page break).   
Cosmo rightly rejected the data as it was not legal XML.  But the  
question remains, what do we do about this situation?  It comes down to:

1) Strip such characters before sending them in XML
2) Abort a sync if the data has such a character
3) Chandler+Cosmo agree on an encoding mechanism

#3 feels like the right thing to do.  One suggestion is to encode all  
non-allowed by XML characters using %XX where the XX are hex digits.   
Should we take that route?

Also, what does Cosmo do when a CalDAV client sends an ICS body that  
has a character like 0x0c in it?