SVGHMI: Makes error when HMI tree is not well formed. Prevents multiple and non-first HMI_NODE, and ensure that all paths in HMI tree are unique.
// widget_button.ysl2
template "widget[@type='Button']", mode="widget_defs" {
param "hmi_element";
| frequency: 5,
| init: function() {
| this.element.addEventListener(
| "mousedown",
| evt => {
| change_hmi_value(this.indexes[0], "=1");
| });
| this.element.addEventListener(
| "mouseup",
| evt => {
| change_hmi_value(this.indexes[0], "=0");
| });
| },
}