Discussions on 4. Metaweb Read Services

section 4.8 states "The trans service does not support a callback parameter as the mqlread service does", this is outdated since the api states it can and it can:

http://www.freebase.com/view/guid/9202a8c04000641f8000000007628edf

The trans example could use some improvement too since it is digging out "unrelated" documents from the store. It would be more informative and more consistent to get documents on the band "the police"

Query to get guid's for articles and images
{
  "article" : [
    {
      "guid" : [
        {}
      ],
      "id" : null
    }
  ],
  "id" : "/en/the_police",
  "image" : [
    {
      "guid" : [
        {}
      ],
      "id" : null
    }
  ],
  "type" : "/common/topic"
}

Query to get the article (function foo can format result without using a proxy):
http://www.freebase.com/api/trans/raw/guid/9202a8c04000641f800000000006df25?callback=foo

Query to get the image (you can use this as the source property of the image element)
http://www.freebase.com/api/trans/image_thumb/guid/9202a8c04000641f8000000003c18713?maxwidth=300&maxheight=300
Note: you cannot make an image bigger than the origional with maxwith and maxheight

Good morning freebaser,

I just began to dive into freebase API - the query editor is invaluable, makes it so easy to get started. Congrats .... 

cheers 

martin

ps An Actionscript example would be handy ;-) 

There's a bug in Example 4.8.   The line that reads

"?queries=" + querytext + "&callback;=Metaweb." + callbackName

should read

"?queries=" + querytext + "&callback=Metaweb." + callbackName

(no semicolon)

Otherwise the callback doesn't get called.

Eric

If you try a GET query that has the URL length go above about 4000 characters, you will get a "Transient Error" from the Freebase API. The API should really return an error of "URL too long, use POST".

 Even though it isn't mentioned, the MQL Read does support POST. I recommend using it instead of GET.

I can't seem to find anything documenting the lifetime of a cursor value returned from the MQL read service.

Do cursors persist between query sessions? If so, for how long? Could I run a query to obtain some data, save the cursor, and then continue where I left off a few days later?

Thanks.

Despite what it says in 4.8. Fetching Content with trans, the trans service DOES support a callback parameter. See