example.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
XML is not suited for this.
We want the declaration site of these bindings to be as close as possible to their use sites.
-->
<!DOCTYPE devops [
    <!ENTITY example_port "1234">
]>
<d:devops
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://spacetimecat.com/xmlns/devops devops.xsd"
        xmlns:d="http://spacetimecat.com/xmlns/devops"
        xmlns:n="http://spacetimecat.com/xmlns/devops/network"
>
    <!-- Define your applications. -->
    <d:application>
        <!-- Name must be unique. -->
        <d:name>example</d:name>
        <d:description>an example application</d:description>
        <d:language>
            <d:java>
                <d:main_class>com.example.Main</d:main_class>
            </d:java>
        </d:language>
        <d:resource_requirement>
            <d:min_cpu>1</d:min_cpu>
            <d:max_cpu>4</d:max_cpu>
            <d:min_memory unit="MB">4096</d:min_memory>
        </d:resource_requirement>
        <d:allow_horizontal_scaling>true</d:allow_horizontal_scaling>
        <d:network>
            <n:forwarding>
                <n:from>
                    <!-- URL base must be unique. -->
                    <n:url_base>http://example.com/</n:url_base>
                </n:from>
                <n:to>
                    <n:local_port>&example_port;</n:local_port>
                </n:to>
            </n:forwarding>
            <n:forwarding>
                <n:from>
                    <!-- This assumes TLS termination at load balancer. -->
                    <n:url_base>https://example.com/</n:url_base>
                </n:from>
                <n:to>
                    <n:local_port>&example_port;</n:local_port>
                </n:to>
            </n:forwarding>
        </d:network>
    </d:application>
</d:devops>