flickrex

{
  "stat": "ok",
  "method": {
    "response": {
      "_content": "<collections>\n<collection id=\"12-72157594586579649\" title=\"All My Photos\" description=\"a collection\" iconlarge=\"http://farm1.static.flickr.com/187/cols/37_43fac2cf79_l.jpg\" \niconsmall=\"http://farm1.static.flickr.com/187/cols/56_43fac2cf79_s.jpg\">\n<set id=\"92157594171298291\" title=\"kitesurfing\" description=\"a set\"/>\n<set id=\"72157594247596158\" title=\"faves\" description=\"some favorites.\"/>\n</collection>\n</collections>"
    },
    "requiredperms": 0,
    "needssigning": 0,
    "needslogin": 0,
    "name": "flickr.collections.getTree",
    "explanation": {
      "_content": "A nested tree of collections, and the collections and sets they contain."
    },
    "description": {
      "_content": "Returns a tree (or sub tree) of collections belonging to a given user."
    }
  },
  "errors": {
    "error": [
      {
        "message": "User not found",
        "code": "1",
        "_content": "The specified user could not be found."
      },
      {
        "message": "Collection not found",
        "code": "2",
        "_content": "The specified collection does not exist."
      },
      {
        "message": "Invalid API Key",
        "code": 100,
        "_content": "The API key passed was not valid or has expired."
      },
      {
        "message": "Service currently unavailable",
        "code": 105,
        "_content": "The requested service is temporarily unavailable."
      },
      {
        "message": "Write operation failed",
        "code": 106,
        "_content": "The requested operation failed due to a temporary issue."
      },
      {
        "message": "Format \"xxx\" not found",
        "code": 111,
        "_content": "The requested response format was not found."
      },
      {
        "message": "Method \"xxx\" not found",
        "code": 112,
        "_content": "The requested method was not found."
      },
      {
        "message": "Invalid SOAP envelope",
        "code": 114,
        "_content": "The SOAP envelope send in the request could not be parsed."
      },
      {
        "message": "Invalid XML-RPC Method Call",
        "code": 115,
        "_content": "The XML-RPC request document could not be parsed."
      },
      {
        "message": "Bad URL found",
        "code": 116,
        "_content": "One or more arguments contained a URL that has been used for abuse on Flickr."
      }
    ]
  },
  "arguments": {
    "argument": [
      {
        "optional": 0,
        "name": "api_key",
        "_content": "Your API application key. <a href=\"/services/api/misc.api_keys.html\">See here</a> for more details."
      },
      {
        "optional": "1",
        "name": "collection_id",
        "_content": "The ID of the collection to fetch a tree for, or zero to fetch the root collection. Defaults to zero."
      },
      {
        "optional": "1",
        "name": "user_id",
        "_content": "The ID of the account to fetch the collection tree for. Deafults to the calling user."
      }
    ]
  }
}