+The "type" value is a mime-type string describing the format of the
+base64-encoded binary data. The terminal must support at mimunum these
+mime-types:
+
+| Type String | Description |
+|---------------|--------------------------------------------------------------|
+| "image/rgb" | Big-endian-encoded 24-bit red, green, blue values |
+| "image/rgba" | Big-endian-encoded 32-bit red, green, blue, alpha values |
+| "image/png" | PNG file data as described by (reference to PNG format) |
+
+A terminal may support additional types. An application can detect
+terminal support for a format by: enabling terminal responses (DECSET
+3001), sending a DMDISPLAY command, and examining the terminal's
+response sequence for success or error.
+
+
+
+The "url" value is a RFC-XXXX defined Universal Resource Located,
+encoded in RFC-XXXX form as a printable ASCII string not containing:
+whitespace, colon (':'), semicolon (';'), or equals ('=').
+
+A terminal is not required to support any URLs.
+
+
+