improve Maintenance overview diagrams

[VladimirAlexiev]

@mhodki

• The stereotype (C) for classes is IMHO unnecessary (can just use (i) for instances)

https://github.com/iofoundry/ontology/blob/master/maintenance/images/fmea_ontology.png

• Subclass arrow directions are inconsistent, better should all go upward
• IMHO "only" should be renamed to "all"

https://github.com/iofoundry/ontology/blob/master/maintenance/images/MaintenanceDevRelationships.png

• The diagram is too wide, some tweaking and "left to right direction" may fix this
• The arrow style is different from "fmea" (that style is better)

https://github.com/iofoundry/ontology/blob/master/maintenance/images/maintenancestate.png

• shows 2 empty compartments per class: "hide empty members" should fix that

If you post the plantuml sources, I'll try to improve them. You can extract them as follows:

plantuml -metadata fmea-malfunction-rule.png
------------------------
fmea-malfunction-rule.png

@startuml
skinparam classFontSize 16
skinparam shadowing false
hide empty members

skinparam class {
        backgroundColor<<ISO 15926>> LightCyan
        backgroundColor<<Functional System>> White
        backgroundColor<<FMEA>> LightYellow
        backgroundColor<<Asset>> PeachPuff
}


class Disposition as "Disposition" <<ISO 15926>>

class Component as "Component" <<Functional System>>
class FailureDueToOverCurrent as "FailureDueToOverCurrent" <<Functional System>>

class FailureEvent as "FailureEvent" <<FMEA>>
class Malfunction as "Malfunction" <<FMEA>>
class ObjectInFaultState as "ObjectInFaultState" <<FMEA>>

class Heater as "Heater" <<Asset>>


class heaters as "heaters" <<Asset>> <<(i,#EE82EE)>>
class heaters_shortcircuit_malfunction as "heaters malfunction\ndue to overcurrent" <<Asset>> <<(i,#EE82EE)>>
class failure_event_heaters_shortcircuit as "heaters overcurrent\nfailure event" <<Asset>> <<(i,#EE82EE)>>


Heater -up-|> Component

Malfunction -up-|> Disposition

FailureDueToOverCurrent -up-|> FailureEvent

heaters -up-> Heater : "?"
heaters -[#black]right-> heaters_shortcircuit_malfunction : "hasMalfunction"
heaters -[#blue]down-> "?\ninferred" ObjectInFaultState

heaters_shortcircuit_malfunction -[#black]right-> failure_event_heaters_shortcircuit : "realizedIn"
heaters_shortcircuit_malfunction -up-> Malfunction : "?"

failure_event_heaters_shortcircuit -up-> FailureDueToOverCurrent : "?"
@enduml

PlantUML version 1.2020.01beta5(Unknown compile time)
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