Measurement:Unit Identifiers - Revision history

Samuel: /* Data Representation Format */

2026-06-10T20:42:59Z

Data Representation Format

← Older revision		Revision as of 20:42, 10 June 2026
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	"value": <numeric_value>,		"value": <numeric_value>,
	"unit": "<canonical_unit>",		"unit": "<canonical_unit>",
	"uncertainty": "<numeric_value>"		"uncertainty": <numeric_value>
	}		}
	</pre>		</pre>

Samuel: /* Data Representation Format */

2026-06-10T20:42:46Z

Data Representation Format

← Older revision		Revision as of 20:42, 10 June 2026
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	"quantity": "<physical_quantity>",		"quantity": "<physical_quantity>",
	"value": <numeric_value>,		"value": <numeric_value>,
	"unit": "<canonical_unit>"		"unit": "<canonical_unit>",
			"uncertainty": "<numeric_value>"
	}		}
	</pre>		</pre>
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	"quantity": "pipe_length",		"quantity": "pipe_length",
	"value": 1200,		"value": 1200,
	"unit": "m"		"unit": "m",
			"uncertainty": 5
	}		}
	</pre>		</pre>

Samuel at 20:35, 10 June 2026

2026-06-10T20:35:40Z

Samuel at 19:47, 10 June 2026

2026-06-10T19:47:15Z

← Older revision		Revision as of 19:47, 10 June 2026
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	REQ-MEAS-UNI-006: Semantic meaning MUST be derived from the quantity field, not from the unit identifier.		REQ-MEAS-UNI-006: Semantic meaning MUST be derived from the quantity field, not from the unit identifier.

	REQ-MEAS-UNI-007: The "Quantity / Name" field MUST be the canonical machine-readable identifier for a physical quantity and MUST be used ~~as-is~~ as the key in all AOWIS data formats, APIs, databases, and serialized representations, ~~without modification~~ or ~~reinterpretation;~~ semantics MUST be derived exclusively from ~~this~~ field and ~~not~~ from unit identifiers.		REQ-MEAS-UNI-007: The "Quantity / Name" field MUST be the canonical machine-readable identifier for a physical quantity and MUST be used as the key in all AOWIS data formats, APIs, databases, and serialized representations.

			REQ-MEAS-UNI-008: The "Quantity / Name" field MUST be treated as an immutable identifier and MUST NOT be modified, localized, abbreviated, or reinterpreted across implementations.

			REQ-MEAS-UNI-009: Physical quantity semantics MUST be derived exclusively from the "Quantity / Name" field and MUST NOT be inferred from unit identifiers.
	</pre>		</pre>

Samuel at 19:42, 10 June 2026

2026-06-10T19:42:16Z

← Older revision		Revision as of 19:42, 10 June 2026
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	REQ-MEAS-UNI-006: Semantic meaning MUST be derived from the quantity field, not from the unit identifier.		REQ-MEAS-UNI-006: Semantic meaning MUST be derived from the quantity field, not from the unit identifier.

			REQ-MEAS-UNI-007: The "Quantity / Name" field MUST be the canonical machine-readable identifier for a physical quantity and MUST be used as-is as the key in all AOWIS data formats, APIs, databases, and serialized representations, without modification or reinterpretation; semantics MUST be derived exclusively from this field and not from unit identifiers.
	</pre>		</pre>

Samuel at 19:36, 10 June 2026

2026-06-10T19:36:59Z

← Older revision		Revision as of 19:36, 10 June 2026
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping
	\|-		\|-
	\| length \|\| Linear spatial extent \|\| m \|\| Pipe/link length (SI-normalized EPANET model)		\| length \|\| Linear spatial extent \|\| m \|\| Pipe/link length (SI-normalized EPANET model)
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping
	\|-		\|-
	\| area \|\| Two-dimensional spatial extent \|\| m2 \|\| Not directly used		\| area \|\| Two-dimensional spatial extent \|\| m2 \|\| Not directly used
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping
	\|-		\|-
	\| volumetric_flow_rate \|\| Volume per unit time \|\| m3_s \|\| Link flow (SI-normalized EPANET model)		\| volumetric_flow_rate \|\| Volume per unit time \|\| m3_s \|\| Link flow (SI-normalized EPANET model)
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping
	\|-		\|-
	\| pressure \|\| Force per unit area in fluid system \|\| Pa \|\| Node pressure (SI-normalized EPANET model)		\| pressure \|\| Force per unit area in fluid system \|\| Pa \|\| Node pressure (SI-normalized EPANET model)
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping
	\|-		\|-
	\| time \|\| Simulation or observation time \|\| s \|\| Simulation time (EPANET internal time normalized to seconds)		\| time \|\| Simulation or observation time \|\| s \|\| Simulation time (EPANET internal time normalized to seconds)
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity !! Definition !! Canonical Unit		! Quantity / Name !! Definition !! Canonical Unit
	\|-		\|-
	\| current \|\| Rate of electric charge flow \|\| A		\| current \|\| Rate of electric charge flow \|\| A

Samuel: /* Electrical Quantities */

2026-06-10T19:35:42Z

Electrical Quantities

← Older revision		Revision as of 19:35, 10 June 2026
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	\| resistance \|\| Opposition to electric current flow \|\| ohm		\| resistance \|\| Opposition to electric current flow \|\| ohm
	\|-		\|-
	\| power \|\| Rate of energy transfer \|\| W ~~\|\| Not represented~~		\| power \|\| Rate of energy transfer \|\| W
	\|-		\|-
	\| energy \|\| Work or transferred electrical energy \|\| J		\| energy \|\| Work or transferred electrical energy \|\| J

Samuel: Samuel moved page Measurement:UnitStrings to Measurement:Unit Identifiers without leaving a redirect

2026-06-10T19:26:56Z

Samuel moved page Measurement:UnitStrings to Measurement:Unit Identifiers without leaving a redirect

← Older revision		Revision as of 19:26, 10 June 2026
(No difference)

Samuel at 18:44, 10 June 2026

2026-06-10T18:44:05Z

← Older revision		Revision as of 18:44, 10 June 2026
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			* Part of: [[Measurement:Main_Page]]
			* Related to: [[Measurement:Units]]

	AOWIS defines a canonical set of unit identifiers used in all system interfaces, storage formats, APIs, and inter-system data exchanges.		AOWIS defines a canonical set of unit identifiers used in all system interfaces, storage formats, APIs, and inter-system data exchanges.

Samuel at 18:39, 10 June 2026

2026-06-10T18:39:01Z

← Older revision		Revision as of 18:39, 10 June 2026
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	~~== Unit Representation Model ==~~

	AOWIS defines a canonical set of unit identifiers used in all system interfaces, storage formats, APIs, and inter-system data exchanges.		AOWIS defines a canonical set of unit identifiers used in all system interfaces, storage formats, APIs, and inter-system data exchanges.

← Older revision		Revision as of 20:35, 10 June 2026
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	AOWIS defines a canonical set of unit identifiers used in all system interfaces, storage formats, APIs, and inter-system data exchanges.		AOWIS defines a canonical set of unit identifiers used in all system interfaces, storage formats, APIs, and inter-system data exchanges.

	All unit identifiers MUST be ASCII-only strings and MUST NOT contain Unicode characters, superscripts, or typographic symbols.		All unit identifiers MUST be lower-case ASCII-only strings and MUST NOT contain Unicode characters, superscripts, or typographic symbols.

	Units are machine-readable tokens and are not intended to represent typographic or human-rendered SI notation.		Units are machine-readable tokens and are not intended to represent typographic or human-rendered SI notation.
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	== General Rules ==		== General Rules ==

	* All unit identifiers MUST be ASCII-only.		* All unit identifiers MUST be lower-case ASCII-only.
	* Unit identifiers MUST be unambiguous and consistent across all AOWIS-compliant systems.		* Unit identifiers MUST be unambiguous and consistent across all AOWIS-compliant systems.
	* Each physical quantity MUST map to exactly one canonical unit.		* Each physical quantity MUST map to exactly one canonical unit.
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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit (SI symbol) !! Serialized Unit !! EPANET Mapping
	\|-		\|-
	\| length \|\| Linear spatial extent \|\| m \|\| Pipe/link length (SI-normalized EPANET model)		\| length \|\| Linear spatial extent \|\| m \|\| m \|\| Pipe/link length (SI-normalized EPANET model)
	\|-		\|-
	\| elevation \|\| Vertical height relative to datum \|\| m \|\| Node elevation (SI-normalized EPANET model)		\| elevation \|\| Vertical height relative to datum \|\| m \|\| m \|\| Node elevation (SI-normalized EPANET model)
	\|-		\|-
	\| distance \|\| Spatial separation between points \|\| m \|\| Derived geometric quantity		\| distance \|\| Spatial separation between points \|\| m \|\| m \|\| Derived geometric quantity
	\|-		\|-
	\| position_offset \|\| Relative spatial offset magnitude \|\| m \|\| Not explicitly represented in EPANET		\| position_offset \|\| Relative spatial offset magnitude \|\| m \|\| m \|\| Not explicitly represented in EPANET
	\|}		\|}

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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit (SI symbol) !! Serialized Unit !! EPANET Mapping
	\|-		\|-
	\| area \|\| Two-dimensional spatial extent \|\| m2 \|\| Not directly used		\| area \|\| Two-dimensional spatial extent \|\| m² \|\| m2 \|\| Not directly used
	\|-		\|-
	\| volume \|\| Storage volume \|\| m3 \|\| Tank volume (SI-normalized EPANET model)		\| volume \|\| Storage volume \|\| m³ \|\| m3 \|\| Tank volume (SI-normalized EPANET model)
	\|}		\|}

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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit (SI symbol) !! Serialized Unit !! EPANET Mapping
	\|-		\|-
	\| volumetric_flow_rate \|\| Volume per unit time \|\| m3_s \|\| Link flow (SI-normalized EPANET model)		\| volumetric_flow_rate \|\| Volume per unit time \|\| m³/s \|\| m3_s \|\| Link flow (SI-normalized EPANET model)
	\|-		\|-
	\| mass_flow_rate \|\| Mass per unit time \|\| kg_s \|\| Not directly represented (derived)		\| mass_flow_rate \|\| Mass per unit time \|\| kg/s \|\| kg_s \|\| Not directly represented (derived)
	\|}		\|}

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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit (SI symbol) !! Serialized Unit !! EPANET Mapping
	\|-		\|-
	\| pressure \|\| Force per unit area in fluid system \|\| Pa \|\| Node pressure (SI-normalized EPANET model)		\| pressure \|\| Force per unit area in fluid system \|\| Pa \|\| pa \|\| Node pressure (SI-normalized EPANET model)
	\|-		\|-
	\| stress \|\| Internal material stress \|\| Pa \|\| Not represented		\| stress \|\| Internal material stress \|\| Pa \|\| pa \|\| Not represented
	\|}		\|}

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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity / Name !! Definition !! Canonical Unit !! EPANET Mapping		! Quantity / Name !! Definition !! Canonical Unit (SI symbol) !! Serialized Unit !! EPANET Mapping
	\|-		\|-
	\| time \|\| Simulation or observation time \|\| s \|\| Simulation time (EPANET internal time normalized to seconds)		\| time \|\| Simulation or observation time \|\| s \|\| s \|\| Simulation time (EPANET internal time normalized to seconds)
	\|-		\|-
	\| duration \|\| Time interval length \|\| s \|\| Simulation duration / reporting intervals		\| duration \|\| Time interval length \|\| s \|\| s \|\| Simulation duration / reporting intervals
	\|}		\|}

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	{\| class="wikitable"		{\| class="wikitable"
	! Quantity / Name !! Definition !! Canonical Unit		! Quantity / Name !! Definition !! Canonical Unit (SI symbol) !! Serialized Unit
	\|-		\|-
	\| current \|\| Rate of electric charge flow \|\| A		\| current \|\| Rate of electric charge flow \|\| A \|\| a
	\|-		\|-
	\| voltage \|\| Electric potential difference \|\| V		\| voltage \|\| Electric potential difference \|\| V \|\| v
	\|-		\|-
	\| resistance \|\| Opposition to electric current flow \|\| ohm		\| resistance \|\| Opposition to electric current flow \|\| Ω \|\| ohm
	\|-		\|-
	\| power \|\| Rate of energy transfer \|\| W		\| power \|\| Rate of energy transfer \|\| W \|\| w
	\|-		\|-
	\| energy \|\| Work or transferred electrical energy \|\| J		\| energy \|\| Work or transferred electrical energy \|\| J \|\| j
	\|-		\|-
	\| capacitance \|\| Ability to store electric charge \|\| F		\| capacitance \|\| Ability to store electric charge \|\| F \|\| f
	\|}		\|}