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All the examples (and all I’ve done with version catalogs) use double quotes.  Unknown whether toml works with single quotes.

e.g.
```[libraries]
groovy-core = { module = "org.codehaus.groovy:groovy", version.ref = "groovy" }
groovy-json = { module = "org.codehaus.groovy:groovy-json", version.ref = "groovy" }
groovy-nio = { module = "org.codehaus.groovy:groovy-nio", version.ref = "groovy" }
commons-lang3 = { group = "org.apache.commons", name = "commons-lang3", version = { strictly = "[3.8, 4.0[", prefer="3.9" } }```

<https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format|Docs>.

Ohh crap. Sorry, I wasn't clear with my question. The question was in regard to quoting the key of the _TOML entry_ itself (e.g. `groovy-core = ...` vs `"groovy.core" = ...`. Not quoting the keys of the elements.

FWIW, single quotes do work. :slightly_smiling_face:

good to know re: single quotes!
No, the key cannot be quoted.  Gradle needs control over that to generate nested accessors.

ok. cool! I was hoping it would treat quoted keys the same as it would treat dotted keys for libraries in the settings.gradle method.

e.g. this is valid:

```dependencyResolutionManagement {
    versionCatalogs {
        libs {
            library('<http://commons.io|commons.io>', 'commons-io', 'commons-io').version('2.11.0')
        }
    }
}```

unfortunately not.  `.` has a special meaning in Toml hence isn’t allowed in the alias; `-` give you the equivalently-generated accessors.

It could just be my ignorance of TOML. But, I was under the assumption that quoted keys allow for literal periods in keys, as opposed to dotted keys, which uses them to define hierarchy.

Cant speak for toml itself;  Gradle uses the toml key as the alias, and doesn’t allow `.` in an alias.
It doesn’t work for me taking an existing entry and trying a quoted version of it:
```junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine" }
"junit.jupiter.engine" = { module = "org.junit.jupiter:junit-jupiter-engine" }```

to be clear - Gradle does allow `.` in programatically created aliases (settings.gradle.kts, for example) but not in TOML, whether quoted or not.