Snippets (text quotes and extracts from authoritative sources)

A Snippet is a short quote or extract (typically a phrase, a sentence, or at most a few sentences) from an authoritative source document such as a specification, technical manual, or design manual. Throughout this site, content is often related to supporting Snippets and each Snippet page links back to the content pages that reference it! The Snippet and Note concepts are very closely related and they support each other.

The Snippet concept is also at the heart of the Parsing Analysis recipe for UML® and SysML®

Kind Snippet quote/extract Source UML keywords SysML keywords Keywords
INFO The participant properties identify the spigot bank and faucet being connected. The end property on the stereotype refers to the corresponding association end in Figure 9-8. OMG Systems Modeling Language (SysML) 1.6 Port AssociationBlock, ParticipantProperty, ParticipantProperty::end
INFO The parametric diagram is a new SysML diagram type that describes the constraints among the properties associated with blocks. This diagram is used to integrate behavior and structure models with engineering analysis models such as performance, ... OMG Systems Modeling Language (SysML) 1.6 Diagram, Constraint SysML Parametric Diagram, constraint parameter, ConstraintBlock Systems Modeling Language, SysML, mathematics, equation, engineering analysis
EXAMPLE, INFO The package diagram (Figure D.3) shows the structure of the model used to evaluate the sample problem. OMG Systems Modeling Language (SysML) 1.6 Package HSUV sample problem
INFO The overall focal ratio of the complete telescope will be f/8 and the optical prescription is an aplanatic Gregorian telescope. Wikipedia Gregorian reflector, aplanatic Gregorian reflector, optical telescope, telescope, reflecting telescope, reflector, Giant Magellan Telescope
INFO The output for SignalSource is named y and is typed by RealSignalOutElement, from the signal flow library ... SysPhS-1.1 SysPhS, signal processing
SEMANTIC The outgoing ActivityEdges of an InitialNode must all be ControlFlows. The control token placed on an InitialNode is offered concurrently on all outgoing ControlFlows. Unified Modeling Language 2.5.1 Activity, InitialNode, ControlNode, control token, ActivityEdge, ActivityNode::outgoing, ActivityNode::incoming
INFO The operations compartment of a Class contains notation for its ownedOperations ... Unified Modeling Language 2.5.1 Class, symbol, compartment, Operation, Class::ownedOperation, operations compartment
INFO The operation oclIsInState(s) results in true if the object is in the state s. Possible states for the operation oclIsInState(s) are all states of the statemachine that defines the classifier's behavior. For nested states the statenames can be combined... Object Constraint Language Version 2.4 State, Classifier, StateMachine Object Constraint Language
CONSTRAINT The only valid use of a Unit instance is to be referenced by the unit property of a ValueType stereotype. OMG Systems Modeling Language (SysML) 1.6 InstanceSpecification QuantityKind, Unit, Unit::quantityKind, ValueType::quantityKind, Unit::definitionURI, QuantityKind::definitionURI scientific unit system, VIM3
INFO The only valid use of a QuantityKind instance is to be referenced by the quantityKind property of a ValueType or Unit. OMG Systems Modeling Language (SysML) 1.6 InstanceSpecification QuantityKind, Unit, Unit::quantityKind, ValueType::quantityKind, Unit::definitionURI, QuantityKind::definitionURI scientific unit system, VIM3
INFO The only normative stereotype based on AbstractRequirement is the Requirement stereotype, ... OMG Systems Modeling Language (SysML) 1.6 AbstractRequirement, Requirement
INFO The objective lens or mirror collects light and brings it to focus creating an image. Wikipedia objective
INFO The number of tokens replaced is equal to the weight of the incoming edge, which defaults to 1. OMG Systems Modeling Language (SysML) 1.6 ObjectNode, MultiplicityElement::/upper, InputPin, Action::/input, token Overwrite, «overwrite»
INFO The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number (represented by the symbol Z). Since each element has a unique number of protons, each element has its own unique atomic number. Wikipedia
SEMANTIC The notation for a LiteralNull varies depending on where it is used. It often appears as the word “null.” Other notations are described elsewhere for specific uses. Unified Modeling Language 2.5.1 value, LiteralNull, null, notation
INFO The Newtonian telescope ... usually has a paraboloid primary mirror but at focal ratios of f/8 or longer a spherical primary mirror can be sufficient for high visual resolution. Wikipedia reflecting telescope, reflector, optical telescope, telescope, Newtonian reflector, mirror, primary mirror, parabolic mirror, spherical mirror, f-ratio, focal length
INFO The neutron is classified as a hadron, because it is a composite particle made of quarks. The neutron is also classified as a baryon, because it is composed of three valence quarks. Wikipedia neutron
INFO The neutron is a subatomic particle, symbol n or n0, with no electric charge and a mass slightly greater than that of a proton. Wikipedia neutron
INFO The neutron has no measurable electric charge. With its positive electric charge, the proton is directly influenced by electric fields, whereas the neutron is unaffected by electric fields. Wikipedia neutron
INFO The neutron has a mean square radius of about 0.8×10−15 m, or 0.8 fm, and it is a spin-½ fermion. Wikipedia neutron
INFO The neutron has a magnetic moment, however, so the neutron is influenced by magnetic fields. The neutron's magnetic moment has a negative value, because its orientation is opposite to the neutron's spin. Wikipedia neutron
INFO The neutron ... is a spin-½ fermion. Wikipedia
EXAMPLE, INFO The need also arises, when adding detail to a structural model, to allocate a connector (at a more abstract level) to a part (at a more concrete level). OMG Systems Modeling Language (SysML) 1.6 Connector, part Allocate, «allocate», structural allocation, Block, part property
INFO, NOTATION The name of the referenced property is built by a string of names separated by “.”, resulting in a form of path name that identifies the property in its local context. OMG Systems Modeling Language (SysML) 1.6 Property multi-level property path, pathname dot notation
INFO The most familiar baryons are protons and neutrons, both of which contain three quarks, and for this reason these particles are sometimes described as triquarks. Wikipedia
INFO The modern English alphabet is a Latin alphabet consisting of 26 letters, each having an upper- and lower-case form. Wikipedia pangram, Webel Parsing Analysis
INFO The mixer constraint specifies the relationship between its one output and the two inputs that come from the low-pass and high-pass filters. The constraint defines the output to be the average of the inputs. SysPhS-1.1 Constraint ConstraintBlock, constraint parameter SysPhS, signal processing, mixer
INFO The message-name appearing in a reply-message-label is the name property of the Message. Unified Modeling Language 2.5.1 reply-message-label, Message, Message::messageSort, MessageSort, MessageSort::reply
INFO The master/slave relationship is indicated by the use of the copy relationship. OMG Systems Modeling Language (SysML) 1.6 Dependency::supplier, Dependency::client AbstractRequirement, Requirement, Copy, AbstractRequirement::/master, AbstractRequirement::text requirements engineering
INFO The magnitude of fluid flow rate through the pipe fluidFlow is the same as the magnitude of flow rates opening1FluidFlow and opening2FluidFlow going through the pipe’s openings, though the values differ in sign. SysPhS-1.1 Constraint constraint parameter, ConstraintBlock SysPhS, pressure, hydraulics, fluid flow
EXAMPLE, INFO The lower connector shows its connector property explicitly, enabling the pipe it contains to be connected to a mounting bracket (the additional part and connector definitions are omitted for brevity). OMG Systems Modeling Language (SysML) 1.6 Connector AssociationBlock, SysML specification figure
INFO The lower and upper properties of the stereotype give the minimum and maximum number of values, respectively, of the property at the bound end of the related bound reference, for each object reached by navigation along its binding path. OMG Systems Modeling Language (SysML) 1.6 EndPathMultiplicity, BoundReference, EndPathMultiplicity::lower, EndPathMultiplicity::upper
INFO The litre (British English spelling) or liter (American English spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm^3), 1000 cubic centimetres (cm^3) or 0.001 cubic metre (m^3). Wikipedia litre, units, scientific unit system, volume
EXAMPLE, INFO The lifelines on Figure D.10 (“whitebox” sequence diagram) need to come from the Power System decomposition. This now begins to consider parts contained in the HybridSUV block. OMG Systems Modeling Language (SysML) 1.6 Lifeline, Sequence Diagram, part HSUV sample problem, Block, part property
NOTATION The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label. The compartment name is otherwise the same as it would appear on ... OMG Systems Modeling Language (SysML) 1.6 compartment property compartment, SysML Internal Block Diagram, IBD :features compartments, :values compartment, :parts compartment, :properties compartment, :references compartment, :flow properties compartment, :operations compartment
NOTATION The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label. OMG Systems Modeling Language (SysML) 1.6 compartment property compartment, SysML Internal Block Diagram, IBD :features compartments, :values compartment, :parts compartment, :properties compartment, :references compartment, :flow properties compartment, :operations compartment
INFO The keyword «connector» before a property name indicates the property is stereotyped by ConnectorProperty. OMG Systems Modeling Language (SysML) 1.6 Connector, AssociationClass ConnectorProperty, AssociationBlock, ParticipantProperty, «connector»
INFO The itemProperty attribute has no values if the item flow is realized by an Association. OMG Systems Modeling Language (SysML) 1.6 InformationFlow ItemFlow, ItemFlow::itemProperty
INFO The item flow in each case specifies what “does” flow on the connector in the particular usage (e.g., gas, water) and the flow property specifies what can flow (e.g., fluid). This enables type matching between the item flows and between flow properties... OMG Systems Modeling Language (SysML) 1.6 ItemFlow
INFO The item flow does not require the heater to accept any kind of fluid, because the source of flow is still producing water, regardless of the generality of the item flow. OMG Systems Modeling Language (SysML) 1.6 InformationFlow ItemFlow
INFO The invariant mass of an electron is approximately 9.109×10−31 kilograms, or 5.489×10−4 atomic mass units. On the basis of Einstein's principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV. Wikipedia
INFO The internal structure of VaporGenerationPlant uses blocks Heating and Evaporation, which have internal structures depicted in Figure 70 and Figure 71, respectively. SysPhS-1.1 SysPhS, humidifier, HVAC&R
INFO The internal structure of the block HumidifierSystem shown in Figure 65 uses the blocks HumidifiedRoom and Humidifier. These two blocks have their own internal structures. SysPhS-1.1 SysPhS, humidifier, HVAC&R
INFO The internal structure of Humidifier in Figure 68 uses a block VaporGenerationPlant, which has an internal structure shown in Figure 69. SysPhS-1.1 SysPhS, humidifier, HVAC&R
INFO The internal structure of HumidifiedRoom depicted in Figure 66 uses a block RelativeHumidity, which has an internal structure depicted in Figure 67. SysPhS-1.1 SysPhS, humidifier, HVAC&R
INFO The internal structure connects hot and cold ports of the participants. OMG Systems Modeling Language (SysML) 1.6 Port AssociationBlock, ParticipantProperty
INFO The Internal Block Diagram in SysML captures the internal structure of a block in terms of properties and connectors between properties. OMG Systems Modeling Language (SysML) 1.6 Diagram, Property Block, SysML Internal Block Diagram, internal structure systems engineering, Model-Based Systems Engineering, SysML, Systems Modeling Language
SEMANTIC The insertion point is ignored if it is used when isReplaceAll=true. Unified Modeling Language 2.5.1 StructuralFeature, AddStructuralFeatureValueAction, StructuralFeatureAction, AddStructuralFeatureValueAction::insertAt, AddStructuralFeatureValueAction::isReplaceAll
INFO The input for SignalSink is named u and is typed by RealSignalInElement, also from the library. The signal processor has an input and output, transforming the signal from the source and passing it to the sink. SysPhS-1.1 SysPhS, signal processing
INFO The humidifier uses information about the room’s humidity level to determine how much vapor to input to the room. The humidifier includes a water tank, a heater controller, and a vapor generation plant. SysPhS-1.1 SysPhS, humidifier, HVAC&R
INFO The heavier quarks rapidly change into up and down quarks through a process of particle decay: the transformation from a higher mass state to a lower mass state. Wikipedia
INFO The heavier muons and taus will rapidly change into electrons and neutrinos through a process of particle decay: the transformation from a higher mass state to a lower mass state. Wikipedia
INFO The Gregorian telescope consists of two concave mirrors; the primary mirror (a concave paraboloid) collects the light and brings it to a focus before the secondary mirror (a concave ellipsoid) where it is reflected back through a hole in the centre ... Wikipedia Gregorian reflector, reflecting telescope, reflector, optical telescope, telescope, mirror, secondary mirror, primary mirror
INFO The Gregorian telescope ... employs a concave secondary mirror that reflects the image back through a hole in the primary mirror. This produces an upright image Wikipedia Gregorian reflector, reflecting telescope, reflector, optical telescope, telescope, mirror, secondary mirror, primary mirror
INFO The giant then says that he will not eat her as he is the Big Friendly Giant, or BFG for short. Wikipedia Webel Parsing Analysis
INFO The giant laughs and explains that most giants do eat human beings (which he pronounces as "human beans") .. Wikipedia Webel Parsing Analysis
INFO The general block on the top does not restrict the bound properties, except the total number of lug bolts is required to be between 24 and 32, rather than 24 and 40 as the associations in Figure 8-15 allow. OMG Systems Modeling Language (SysML) 1.6 Generalization, Property::redefinedProperty BoundReference, BindingConnector, nested Property
EXAMPLE, INFO The Fuel store represents a quantity of fuel in the FuelTankAssy, which is drawn by the FuelPump for use in the engine, and is refreshed, to some degree, by fuel returning to the FuelTankAssy via the FuelReturnLine. OMG Systems Modeling Language (SysML) 1.6 Connector HSUV sample problem, SysML Internal Block Diagram
INFO The front and rear (or back) focal planes are defined as the planes, perpendicular to the optic axis, which pass through the front and rear focal points. Wikipedia optics, focal plane, rear focal plane, optic axis, focal point
INFO The free proton is stable. Wikipedia neutron
INFO The free neutron has a mass of 939,565,413.3 eV/c2, or 1.674927471×10−27 kg, or 1.00866491588 u. Wikipedia neutron
NOTATION The form of the line or arrowhead reflects properties of the message OMG Systems Modeling Language (SysML) 1.6 Message, MessageEnd
INFO The following table covers four different engineering domains. In each domain, we see the choice of through and across variables that we will be using along with the SI units for those quantities. Modelica By Example Modelica, acausal connection
INFO The following paragraphs describe types of allocation that are typical in systems engineering. OMG Systems Modeling Language (SysML) 1.6 Allocate, allocation, «allocate»
INFO The following Modelica example corresponds to the SysML block A in Figure 18. It has a Modelica model A corresponding to the SysML block A, with a component b1 typed by Modelica model B, corresponding to the SysML property b1 typed by block B. SysPhS-1.1 SysPhS
INFO The following Modelica code corresponds to Figure 29. SysPhS-1.1 Modelica, SysPhS
INFO The following Modelica code corresponds to Figure 28. It has a type Force, which extends Real, and the unit symbol N assigned to it. SysPhS-1.1 Modelica
INFO The following Modelica code corresponds to Figure 26. It has five equations from the SysML constraint block. SysML parameter names are replaced in the Modelica equations according the bindings in Figure 14 [ERROR]: SysPhS-1.1 Constraint ConstraintBlock, constraint parameter, constraint property SysPhS, SysML, Systems Modeling Language, Modelica
INFO The following Modelica code corresponds to Figure 25. It has three equations from the constraint block. SysPhS-1.1 Constraint ConstraintBlock SysPhS, Modelica, SysML, Systems Modeling Language
INFO The following Modelica code corresponds to Figure 24. It has a model Example with two components s1 and s2 of types SpringA and SpringB, respectively. The models SpringA and SpringB have two components p1 and p2 of type Flange, defined similarly to Spring SysPhS-1.1 Connector, Port "standard" Port, FlowProperty
INFO The following Modelica code corresponds to Figure 23. It has a model Spring, with two components p1 and p2 of type Flange. Flange is a connector that has one flow component f, and one regular component lV. SysPhS-1.1 SysPhS
INFO The following Modelica code corresponds to Figure 22. It has a model Spring, with two components u and y of type Real and of direction respectively in and out. SysPhS-1.1 SysPhS
INFO The following Modelica code corresponds to Figure 21. It has a model A, with three properties v1, v2 and v3 of type Real, that are continuous, discrete, and parameter, respectively. SysPhS-1.1 SysPhS
INFO The following Modelica code corresponds to Figure 20. It has a model A with component c1 indicated as replaceable, and a model B extending A with a component of the same name redeclaring it to alter the type ... SysPhS-1.1 SysPhS
INFO The following Modelica code corresponds to Figure 19. It has a model A with a component c1 of type C, and a model B that extends A. As a result, B inherits the component c1 from A. SysPhS-1.1 SysPhS
INFO The following Modelica code corresponds to Figure 15 [ERROR]. SysPhS-1.1 SysPhS, Modelica
INFO The fluid flow rate through the pipe, fluidFlow, is proportional to the pressure difference by the constant resistance, which depends on the geometric properties of the pipe as well as fluidic properties. SysPhS-1.1 Constraint constraint parameter, ConstraintBlock SysPhS, pressure, hydraulics, fluid flow
INFO The flow properties are all in the types of the nested ports, while the composing item flow summarizes the kinds of items flowing by generalization. OMG Systems Modeling Language (SysML) 1.6 Connector, InformationFlow::conveyed ItemFlow, AssociationBlock
INFO The flange of the mass and the flange of the ground replace the participant properties of the association block and are connected to the property f of type Friction in the same way as in the association block SysPhS-1.1 Connector AssociationBlock, ConnectorProperty SysPhS, SysML, Systems Modeling Language
INFO The first-generation leptons, also called electronic leptons, comprise the electron ( e− ) and the electron neutrino ( ν e); Wikipedia
INFO The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses. Wikipedia telescope, optical telescope, astronomy
INFO The first constraint is that the through variable should be the time derivative of some conserved quantity. Modelica By Example Modelica, acausal connection
INFO The first class of variables we will discuss are “across” variables (also called potential or effort variables). Differences in the values of across variables across a component are what trigger components to react. Modelica By Example Modelica, acausal connection
INFO The finite size of the neutron and its magnetic moment both indicate that the neutron is a composite, rather than elementary, particle. Wikipedia neutron
EXAMPLE, INFO The fdist connector inside the InternalCombustionEngine block has been expanded into the fuel regulator and fuel rail parts. These more detailed design elements are related to the original connectors using the allocation relationship. OMG Systems Modeling Language (SysML) 1.6 Connector HSUV sample problem, SysML Internal Block Diagram
INFO The famous pipe. How people reproached me for it! And yet, could you stuff my pipe? No, it's just a representation, is it not? So if I had written on my picture "This is a pipe", I'd have been lying! Wikipedia
INFO The eyepiece is placed near the focal point of the objective to magnify this image. The amount of magnification depends on the focal length of the eyepiece. Wikipedia objective
INFO The expose relationship relates a view to one or more model elements. Each model element is an access point to initiate the query. OMG Systems Modeling Language (SysML) 1.6 Dependency Expose, View
EXAMPLE The explicit structural allocation between the original connectors of Figure D.19 and this new bus architecture is shown in Figure D.39. OMG Systems Modeling Language (SysML) 1.6 Connector allocation, Allocate
EXAMPLE, INFO The example in Figure 16-6 is taken from the automotive safety domain, and shows a Burnish requirement contained in the NHTSASafetyRequirements requirement. Note that the text of the Burnish requirement indicates a specific sequence of steps and transitio OMG Systems Modeling Language (SysML) 1.6 HSUV sample problem, SysML specification figure, Requirement, AbstractRequirement::text requirements engineering
INFO The event that enables this trigger is called a completion event and it signifies that all Behaviors associated with the source State of the completion Transition have completed execution. Unified Modeling Language 2.5.1 StateMachine, State, completion, completion transition, implicit trigger, Transition, Trigger, completion event, Trigger::event
INFO The evaluated default then becomes the initial value (or values) of the Property. Unified Modeling Language 2.5.1 Property, Property::defaultValue UML, Unified Modeling Language
SEMANTIC The entry, exit, and effect Behaviors and internal Transitions are defined as contained in the submachine State. Unified Modeling Language 2.5.1 State, StateMachine, submachine, State::entry, State::exit, Transition, Transition::effect
EXAMPLE, INFO The entities are conceptual in nature during the initial phase of development, but will be refined as part of the development process. OMG Systems Modeling Language (SysML) 1.6 context diagram, SysML Internal Block Diagram
INFO The enthalpy of vaporization of Water at 100 deg C = 2257 (J/g) Wikipedia volumetric heat capacity, thermodynamics, joule, enthalpy of vaporisation, latent heat of vaporisation, heat of evaporation, enthalpy, evaporation
INFO The enthalpy of vaporization is often quoted for the normal boiling temperature of the substance. Wikipedia volumetric heat capacity, thermodynamics, joule, enthalpy of vaporisation, latent heat of vaporisation, heat of evaporation, enthalpy, evaporation
INFO The enthalpy of vaporization is a function of the pressure at which that transformation takes place. Wikipedia volumetric heat capacity, thermodynamics, joule, enthalpy of vaporisation, latent heat of vaporisation, heat of evaporation, enthalpy, evaporation
INFO The enthalpy of vaporization (symbol ∆Hvap), also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas. Wikipedia volumetric heat capacity, thermodynamics, joule, enthalpy of vaporisation, latent heat of vaporisation, heat of evaporation, enthalpy, evaporation
INFO The EndPathMultiplicity stereotype can be applied to properties that are related by redefinition to properties that have BoundReference applied. OMG Systems Modeling Language (SysML) 1.6 EndPathMultiplicity, BoundReference
INFO The elements in a group are identified by the modeler, as opposed to being the result of a query, as in views. OMG Systems Modeling Language (SysML) 1.6 Comment, Comment::annotatedElement ElementGroup, ElementGroup::/member