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stub_indexes.md: suggest externalPrefixId more strongly, link sample using it

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Yann Cébron 2022-08-30 11:38:57 +02:00
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topics/basics/indexing_and_psi_stubs/stub_indexes.md
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@ -25,7 +25,9 @@ You usually don't need to have stubs for things like statements or local variabl
The following steps need to be performed only once for each language that supports stubs:
* Change the file element type for your language (the element type that you return from `ParserDefinition.getFileNodeType()`) to a class that extends [`IStubFileElementType`](%gh-ic%/platform/core-impl/src/com/intellij/psi/tree/IStubFileElementType.java).
* In your <path>plugin.xml</path>, define the `com.intellij.stubElementTypeHolder` extension and specify the interface which contains the `IElementType` constants used by your language's parser as well as `externalIdPrefix` if possible ([example](%gh-ic%/plugins/properties/src/META-INF/plugin.xml)).
* In your <path>plugin.xml</path>, define the `com.intellij.stubElementTypeHolder` extension and specify the interface which contains the `IElementType` constants used by your language's parser and common `externalIdPrefix` (see Javadoc for requirements).
**Example**: [`JavaStubElementTypes`](%gh-ic%/java/java-psi-impl/src/com/intellij/psi/impl/java/stubs/JavaStubElementTypes.java) registered in [`JavaPsiPlugin.xml`](%gh-ic%/java/java-psi-impl/src/META-INF/JavaPsiPlugin.xml)
For each element type that you want to store in the stub tree, you need to perform the following steps: