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pragma solidity ^0.4.19;
import "github.com/oraclize/ethereum-api/oraclizeAPI_0.5.sol";

contract SimpleOraclizeContract is usingOraclize {

string public ETHXBT; // XBT is a synonym of BTC 
    event LogConstructorInitiated(string nextStep);
    event LogPriceUpdated(string price);
    event LogNewOraclizeQuery(string description);

function SimpleOraclizeContract() payable {
        LogConstructorInitiated("Constructor was initiated. Call 'updatePrice()' to send the Oraclize Query.");
    }

function __callback(bytes32 myid, string result) {
        if (msg.sender != oraclize_cbAddress()) revert();
        ETHXBT = result;
        LogPriceUpdated(result);
    }