+ <!-- A lot resources like steel and concrete are required
+ for new high buildings. Some older or futuristic may
+ require different resources. //-->
+ <resource-list extends="{?resources_template?}">
+ <!-- A single resource and its amount to construct this
+ building. //-->
+ <resource>
+ <id>{?resource_id?}</id>
+ <amount>{?resource_amount?}</amount>
+ <!-- The merchant dealing with this resource. //-->