Thanks all,

Do you know where I can find the proto2 encoding guide?
The proto site has only the proto3 encoding described.

On Saturday, March 26, 2016 at 12:21:39 PM UTC-7, Tim Kientzle wrote:
> > On Mar 26, 2016, at 11:43 AM, Yoav H < <javascript:>> 
> wrote: 
> > 
> > Hi, 
> > 
> > I wanted ask regarding the decision to populate fields with default 
> values, even if they do not appear in the encoded message. 
> > If I want to send a "patch" message, where I want to update just the 
> provided fields, how can I do that with protobuf (without adding IsXXXSet 
> for every field)? 
> > 
> > Why not add another type, representing a default value? 
> > So the schematics would be, if the field is missing, it is null, and if 
> the field exists, but with this "missing value" type, it will get the 
> default value? 
> As Ilia pointed out, proto2 still exists, is still supported, and can be 
> used for 
> cases where you require these particular semantics. 
> For proto3, you might look at google.protobuf.FieldMask, which is a new 
> standard message (one of the "well-known types") specifically designed 
> to store a set of field names.  You might be able to achieve what you want 
> by 
> providing a FieldMask with your data listing the specific fields to 
> be updated. 
> Tim 

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