titlegraphic syntax

[Ant Eagle <ant-DePdjkTX6oTpmi9iPZTz7g@public.gmane.org>]

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I know that the beamer template includes a way to use the metadata variable 
`titlegraphic`. But the template seems to be quite basic:

```
$if(titlegraphic)$
\titlegraphic{\includegraphics{$titlegraphic$}}
$endif$
```
Is there any way to add standard image attributes, such as width, etc., 
without modifying the template? I guess the answer is no since there is 
nothing in the template that would yield 
`\includegraphics[width=5cm]{$titlegraphic$}`, but then my question, being 
mostly ignorant of the variable syntax in templates, is whether it is 
possible to parse a single metadata variable into two components, e.g., to 
take the markdown source

`titlegraphic: image.png {width=5cm}`

and yield the beamer code

`\titlegraphic{\includegraphics[width=5cm]{image.png}}`

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