Configuration Variables
As we've mentioned, the two basic places where the administrator interacts with Xen's networking are in /etc/xen/xend-config.sxp and in the domain config file. In each of these, you focus on one line: the (network-script) line in the former case and the vif= line in the latter.
Each of these will fail horribly, without explanation, over trivial errors in syntax. (This is Python, after all. You can put arbitrary Python code right in your config files, if you like. Configuration files should always be written in a language that's Turing-complete. Just ask Eric Allman.)
The network-script line is wrapped in parentheses, with arguments in quotes and separated by spaces. For example, the following is valid:
(network-script 'network-bridge ...
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