Many paradigms require a variant template that displays the locative. Currently, that means the same paradigm will have at least two templates:

1. Declined without Locative
2. Declined with Locative

Furthermore, many paradigms require up to three variant templates based on which numbers are displayed:

1. Singular & Plural
2. Singular Only
3. Plural Only

Theoretically, this means there are up to six variant templates:

1. Singular & Plural without Locative - e.g. most common nouns
2. Singular Only without Locative - e.g. names of individuals
3. Plural Only without Locative - e.g. common nouns that take only the plural
4. Singular & Plural with Locative - e.g. common nouns with locative connotations
5. Singular Only with Locative - e.g. names of cities
6. Plural Only with Locative - e.g. names of cities that take the plural

It seems to make more sense to have a single template for each paradigm. This is possible if we indicate variants systematically using optional named parameters.

I have designed two separate proposals in order to show what what is possible. I prefer the first proposal, but I am amenable to feedback based on what is better for editors. In the first proposal, we use a single named parameter called "options" to handle all six number/loc variations. In the second proposal, we use two named parameters to handle the locative and number variations separately.

This proposal sacrifices perspicuity for brevity.

For examples, see below.

1. Singular & Plural without Locative - (this is the default)
2. Singular Only without Locative - |options=S (S means singular-only)
3. Plural Only without Locative - |options=P (P means plural-only)
4. Singular & Plural with Locative - |options=L (L means "display the locative")
5. Singular Only with Locative - |options=SL
6. Plural Only with Locative - |options=PL

This proposal sacrifices brevity for perspicuity.

For examples, see my other example page here.

1. Singular & Plural without Locative - (this is the default)
2. Singular Only without Locative - |number=singular
3. Plural Only without Locative - |number=plural
4. Singular & Plural with Locative - |loc-include=yes
5. Singular Only with Locative - |loc-include=yes|number=singular
6. Plural Only with Locative - |loc-include=yes|number=plural

In my proposal, all templates configured to display the Singular & Plural without Locative case by default.

Example noun: Lua error in Module:la-nominal at line 2573: Parameters 2, 3, 4 and 5 are not used by this template. lord, master.

{{User:Maikxlx/Template:la-decl-2M|domin}}

Results in:

Example noun: Lua error in Module:la-nominal at line 2573: Parameters 2, 3, 4 and 5 are not used by this template. (cognomen).

{{User:Maikxlx/Template:la-decl-2M|Brut|Brūt|options=S}}

Results in:

Example noun: Lua error in Module:la-nominal at line 2573: Parameters 2, 3, 4 and 5 are not used by this template. children.

{{User:Maikxlx/Template:la-decl-2M|liber|līber|options=P}}

Results in:

Example noun: Lua error in Module:la-nominal at line 2573: Parameters 2, 3, 4 and 5 are not used by this template. earth, ground

{{User:Maikxlx/Template:la-decl-2M|hum|options=L}}

Results in:

Example noun: Lua error in Module:la-nominal at line 2573: Parameters 2, 3, 4 and 5 are not used by this template. city of Corinth

{{User:Maikxlx/Template:la-decl-2M|Corinth|options=SL}}

Results in:

Example noun: Lua error in Module:la-nominal at line 2573: Parameters 2, 3, 4 and 5 are not used by this template. city of Pompeii

{{User:Maikxlx/Template:la-decl-2M|Pompei|options=PL}}

Results in:

Please discuss this issue on the Latin declension template page.