Article IDs can be returned in short or long form depending on the API method.
tag:google.com,2005:reader/item/
followed by the ID as an unsigned base 16 number that is 0-padded so that it's always 16 characters wide.Here's some sample mappings between the two forms:
Long form | Short form |
---|---|
tag:google.com,2005:reader/item/00000000148b9369 | 344691561 |
tag:google.com,2005:reader/item/00000000148b383e | 344668222 |
tag:google.com,2005:reader/item/00000000148b3841 | 344668225 |