import "github.com/blevesearch/bleve/registry" // Register a custom tokenizer factory: myTokenizer := func(config map[string]interface{}, cache *registry.Cache) (tokenizer.Tokenizer, error) { // implementation details... } registry.RegisterTokenizer("my_tokenizer", myTokenizer) // Use a cached tokenizer: cachedTokenizer, err := registry.CacheTokenizerNamed("my_tokenizer", nil, nil)In this example, a custom tokenizer factory is registered with the name "my_tokenizer". Later, the `CacheTokenizerNamed` function is used to retrieve a cached tokenizer with that name. The second and third arguments to `CacheTokenizerNamed` are optional configuration parameters and a cache instance, respectively. Overall, this package seems to be a part of the larger Bleve search engine library for Go.