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Items and Spacers

<item> places a catalog icon inside its parent group or container.

<public-subnet id="public" title="Public Subnet">
  <item id="1178" name="web" />
  <item />
  <item id="1189" name="edge" />
</public-subnet>
AttributeDescription
idService catalog ID. Empty or omitted means spacer
nameOptional connection reference
refOptional connection reference
dx / dyRelative icon offset in pixels from the icon's normal layout x,y position. The moved icon rectangle must remain inside the parent frame/group border

When no icon is found for a service ID, rendering skips that item and emits a warning.

Use <spacer /> or <blank /> for explicit empty grid cells:

<spacer />
<blank />

Spacers occupy layout slots but render no icon, label, border, or text.