I'm not entirely sure if it's WP-specific - it's certainly not part of the MT spec, from what I understand.

WP provides for multiple values for the one key, which is why the numeric ids are there; if no ID is present, WP will create a new field, regardless of prior fields with the same key.

I like your idea of using the x- prefix; perhaps a syntax like:

x-«field»-«identifier»: «value»

..Would provide for the numeric ID?  Thoughts?

On 28/11/2008, at 11:03 PM, Allan Odgaard wrote:

On 28 Nov 2008, at 04:33, Michael Tyson wrote:

[...] format:
Custom: field_name (field_id) = field_value

Where field_id is an optional numeric value, and retrieved when  
fetching posts.

Is this specific to WP, i.e. allowing field retrievel via numeric ids?

I think I would prefer a syntax more like:

   x-«field»: «value»

But that does not allow for numeric value, but I am sort of assuming  
all custom fields should just be passed to server as key/value pairs!?!

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