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This article provides details of how ICU plural plurals syntax can be processed in XTM Cloud, explaining what is possible, and what is not.

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While nouns only have two forms in the English language (example: singular one – month, plural other – months), other languages can have up to 6 forms (example, Polish: one – miesiąc, few – miesiące, many – miesięcy, other – miesiąca). Using ICU plurals syntax, you can encode multiple versions of a particular sentence, depending on the value of a number variable. This is especially useful in the localization industry.

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{num, plural, zero {Selected {num} items} one {Selected {num} item} two {Selected {num} items} few {Selected {num} items} many {Selected {num} items} other {Selected {num} items}}

The first argument (“num” num in this example) is the name of a variable that will be used to choose which version of the sentence should be selected. The application interpreting the syntax will select the appropriate version of the sentence according to the value of this variable.

The second argument (“plural” in this example) states that the variable holds a numerical value. Alternatively, a “select” argument can be used, which specifies that the variable contains a text value corresponding to a keywordplural or select) indicates whether the variable should be interpreted using pluralization rules or based on specific keywords (for non-numeric values). In general, if the second argument is plural, the variable from the first argument has a numeric value. If the second argument is select, the variable will hold a text value.

Following the two arguments, there is a list of keywords: “zero”, “one”, “two”, “few”, “many”, “other” when using “plural”, or a custom set of keywords when using “select”.

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Each keyword is followed by a sentence in curly brackets that corresponds to the plural form named by the keyword before it. These sentences can contain variables in curly brackets, but do not have to do so. You can use # as a number variable in “plural” (instead of writing the full variable name in curly brackets). If you do not want something (e.g. curly brackets) to be treated as a syntax element, you can escape it using an apostrophe.

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When creating an ICU plural message, you can use the Online ICU Message Editor to check if it works as you expect.

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How does XTM Cloud handle

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ICU plurals syntax?

To request a configuration that processes the ICU plurals syntax efficiently, you need to create a ticket for the XTM Support team.

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In JSON files, we can activate our special ICU plurals parser, which interprets the ICU plurals syntax and adds or removes plural forms for translation, depending on the target file.

The parser (usually a project-level filter template) needs to be selected before a file is uploaded (during project creation or before uploading a new file is uploaded to the project), as the number of plural forms is adjusted during the initial analysis of a file.

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Like any other JSON file, other metadata can also be extracted.

Currently, when a JSON file is processed with the ICU parser enabled, you should avoid the following:

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XTM Cloud does not currently support numbered plural forms in which, for example, a plural version is chosen for a specific number, e.g. . For example, =7 days can be called a “week” or =0 days can be called “no days” instead of “0 days”.
When a numbered form is used in the source file, it will not be returned to the target file.

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In files whose format is not JSON, no ICU syntax parser is available yet, in XTM Cloud. The XTM Support team can only configure custom variables to convert the syntax elements that these non-JSON files contain into inline tags.

Consequently, the ICU plurals syntax is partially protected from modification, but the inline tags must be placed carefully to ensure that everything works as expected.

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