Article ID formats

Article IDs can be returned in short or long form depending on the API method.

• Long form: The prefix 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.
• Short form: The ID as a signed base 10 number.

Here's some sample mappings between the two forms: