Write metadata into image file.

parameters

Parameters are names of metadata properties:

Parameters values are :

(string) patchable string with values from contextual object
variable is a character sequence starting with ${ and finishing with }. Between these caracters, put tha path of the field, as a dot separated list of field names. Text outside these sequences remains unchanged.
the contextual object is the one to which the image is attached, if any
By examples:
- ${status.name}
- Author is ${photograph.name}
- static text
(string) string starting with prop:
the name of a property of contextual object
By example: prop:description
(string) string starting with eval:
A JavaScript expression with these variables:
- currentobject: (JavaScriptObjectBean) contextual object
- currentpath: (String) contextual file path
- locale: (Locale) contextual locale

Simplified syntax

{
   "metatadata": {
      "artist":"John Smith",
      "manufacturer":"Leikon"
   }
}

Simplified syntax (using couple name=value) : mv_artist="John Smith",mv_manufacturer="Leikon",c_metadata

Simplified syntax (using value set): vs_{artist:'John Smith',manufacturer:"Leikon"},c_metadata