[Developers] List Of Properties

[Warren Harris]

On Jul 8, 2008, at 5:40 PM, Jason Douglas wrote:

> So if you do your query for '/guid/9202a8c04000641f80000000002eb15e',
> which is the movie 'Hard Eight', there's no evidence of the Character
> property of Film Performance in the MQL response because while there
> are several CVT instances with the Actor property filled-in, none have
> the Character property set.
>
> Interestingly enough, though, in the course of looking for an example
> I found that freebase.com seems to have the same issue (no Character
> column):
> 	http://www.freebase.com/view/guid/9202a8c04000641f80000000002eb15e

It occurred to me that you can get the schema information for cvt  
properties with this all-in-one query at the same time you get  
everything else (whether or not the object in question has values for  
those properties) by requesting more from the expected_type clauses.  
Unfortunately, this means your application has to look in 2 places in  
the result to know what/how to display -- first in the property's  
expected_type's properties (for cvt schema), and then in the  
property's links' target's any_master/any_value for whether or not  
there are values of these cvt properties (yeah... don't try this at  
home):

{
"id":"/guid/9202a8c04000641f80000000002eb15e",
"type":[{
  "id|=":["/film/film"],
  "name":null,
  "guid":null,
  "properties":[{
     "optional":true,
     "id":null, "name":null,
     "index" : null, "sort":"index",
     "expected_type":{
         "id": null, "name":null, "guid":null,
         "properties":[{
             "id":null, "name":null,
             "index" : null, "sort":"index",
             "optional":true,
             "/freebase/property_hints/disambiguator":true
         }]
     },
     "o:links":[{
         "source": {"id": "/guid/ 
9202a8c04000641f80000000002eb15e","limit":0},
         "target_value":null,
         "target":{
             "id":null, "guid":null, "name":null,
             "/type/reflect/any_master":[{
                 "name":null, "id":null, "guid":null,
                 "link":{"master_property":{
                             "/freebase/property_hints/ 
disambiguator":true,
                             "/type/property/expected_type":null,
                             "id":null, "name":null},
                         "target": {"id": "/guid/ 
9202a8c04000641f80000000002eb15e","optional":"forbidden"}},
                 "optional":true
             }],
             "/type/reflect/any_value":[{
                 "value":null, "type":null,
                 "link":{"master_property":{
                             "/freebase/property_hints/ 
disambiguator":true,
                             "/type/property/expected_type":null,
                             "id":null, "name":null},
                         "target": {"id": "/guid/ 
9202a8c04000641f80000000002eb15e","optional":"forbidden"}},
                 "optional":true
             }],
             "optional":true
         },
         "limit":10,
         "optional":true
     }],
     "master_property":{
         "id":null, "name":null,
         "expected_type":{
             "id": null, "name":null, "guid":null,
             "properties":[{
                 "id":null, "name":null,
                 "index" : null, "sort":"index",
                 "optional":true,
                 "/freebase/property_hints/disambiguator":true
             }]
         },
         "i:links":[{
             "target": {"id": "/guid/ 
9202a8c04000641f80000000002eb15e","limit":0},
             "target_value":null,
             "source":{
                 "name":null, "id":null, "guid":null,
                 "/type/reflect/any_master":[{
                     "name":null, "id":null, "guid":null,
                     "link":{"master_property":{
                                 "/freebase/property_hints/ 
disambiguator":true,
                                 "/type/property/expected_type":null,
                                 "id":null, "name":null},
                             "target": {"id": "/guid/ 
9202a8c04000641f80000000002eb15e","optional":"forbidden"}},
                     "optional":true
                 }],
                 "/type/reflect/any_value":[{
                     "value":null, "type":null,
                     "link":{"master_property":{
                                 "/freebase/property_hints/ 
disambiguator":true,
                                 "/type/property/expected_type":null,
                                 "id":null, "name":null}},
                     "optional":true
                 }],
                 "optional":true
             },
             "limit":10,
             "optional":true
         }]
     }
     }]
  }]
}

(not sure, but maybe I need additional "master_properties" clauses in  
there too?)

Warren
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