Follow the below steps for ‘Refer LOGO location from XML’ 
- Insert a dummy image in our template.
 - In the format picture dialog box select the web tab. Enter the following syntax in the Alternative text region to reference the image URL:
 
url: {IMAGE_LOCATION}.
Where IMAGE_LOCATION is an element from our XML file
that holds the full URL to the image .
 We can also
build a URL based on multiple elements at runtime. Just use the Concat function
to 
build the URL string. For example:
url: {concat(SERVER,’ / ‘,IMAGE_DIR,’ /
‘,IMAGE_FILE)}
This method can also be used with the OA_MEDIA
reference as follows
url: {concat{‘${OA_MEDIA}’ , ‘ / ‘,IMAGE_FILE)}
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