How to design xml schema for digital circuits?
A simple example.

Assume the following circuit in symbolic notation:

Cir = ((A OR B) AND (C OR D)) OR (NOT(D) AND F), where OR , AND, NOT etc can be realized with serial/parallel connections etc..

XML scheme proposition:

&lt;circuit&gt;
    &lt;gate-or&gt;
        &lt;element&gt;
            &lt;gate-and&gt;
                &lt;element&gt;
                    &lt;gate-or&gt;
                        &lt;element&gt;A&lt;/element&gt;
                        &lt;element&gt;B&lt;/element&gt;
                    &lt;/gate-or&gt;
                &lt;/element&gt;
                &lt;element&gt;
                    &lt;gate-or&gt;
                        &lt;element&gt;C&lt;/element&gt;
                        &lt;element&gt;D&lt;/element&gt;
                    &lt;/gate-or&gt;
                &lt;/element&gt;
            &lt;/gate-and&gt;
        &lt;/element&gt;
        &lt;element&gt;
            &lt;gate-and&gt;
                &lt;element&gt;
                    &lt;gate-not&gt;D&lt;/gate-not&gt;
                &lt;/element&gt;
                &lt;element&gt;F&lt;/element&gt;
            &lt;/gate-and&gt;
        &lt;/element&gt;
    &lt;/gate-or&gt;
&lt;/circuit&gt;


This is an example xml-scheme where the root element is circuit and can have gates or elements as children and each gate (eg gate-or or gate-and) can have elements as children etc..

Of course this is very verbose , a yaml or json representation scheme would be lighter