# concept[].definition
When URL is clicked, the resource can be seen directly (by webpage or by download link format).

# concept[].display
The URL is the RESTful or other kind of API that can access to the result.

# concept[].definition
When the API method (e.g. [base_url]/[parameter]) related with the URL of the website is executed, the resource can be seen directly (usually in JSON or XML format).

# concept[].display
Result cannot be access unless an account is logged in

# concept[].definition
When logged into the website, the resource can be seen.

# concept[].display
Result need to be fetched with API and need LOGIN( or cookies are required when visiting the link of resource)

# concept[].definition
When logged in and  follow the API in the website related with URL, the resource can be seen.

# concept[].display
Some other complicated or particular way to get resource from URL.

# concept[].definition
Some other complicated or particular way to get resource from URL.