This is thought to be imported outside of PCLT package by modules, that use PCLT logics (catalog formation routines and messages generation routines)

And another briefing on what is PCLT. First is in the top level of Haddock documentation provided for the package.

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 export "Text.PCLT.SH__"

This module provides interfaces to the classes ShowAsPCSI and HasStaticRawPCLTs an all the routines, that usually are used for declaration of their instanitations.

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 export "Text.ConstraintedLBS"

A constrainting (the constraint here is on it's size) wrapper for a lazy ByteString (LBS) - this container is used for messages generated from PCLT templates

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 export "Text.PCLT.InitialDefaultCatalog"

 initDefaultCatalog_3 :: Text.PCLT.Catalog.PCLT_CatalogID -> (StdErr_CLBS, ShowDetalizationLevel, LanguageName) -> (PCLT_Catalog, StdErr_CLBS)

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 export "Text.PCLT.Catalog"

Catalog is a unit with 3 fields: catalog ID, config, and a map by template_IDs of templates, where each template is: minimal SDL required to represent message from this template, and a maps by languages of localized templates.

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 export "Text.PCLT.CatalogFromHSRT"

We want to add to the default catalog some our application specific entries (templates)

 addFromHSRTToCatalog_2 :: HasStaticRawPCLTs a => a -> PCLT_Catalog -> (StdErr_CLBS, ShowDetalizationLevel, LanguageName) -> (PCLT_Catalog, StdErr_CLBS)

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 export "Text.PCLT.CommonTypes"

Some type aliases, like LanguageName = String

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 export "Text.PCLT.Config"

Configuration that influences the behaviour of catalog formation routines and messages generation routines.

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 export "Text.PCLT.MakeMessage"

PCSI(template_id + params) + language_name + recepient_SDL + catalog >---(Text.PCLT.MakeMessage)---> message

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 export "Text.PCLT.MakeMessage2"

Some comfort wrappers for Text.PCLT.MakeMessage

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 export "Text.PCLT.SDL"

SDL (Show Detalization Level) is a 1-dimensional variable type, built on Int, but extended with additional values:

Zero_SDL (absolute minimal level) < One_SDL (minimal something) < SDL Int < InfinitelyBig_SDL

With SDL we regulate, how much some Reader (of our generated messages) wishes (is allowed) to see.

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 export "Text.PCLT.ShowAsPCSI__"

Some general instances of ShowAsPCSI class are to be found here (Bool, ShowAsPCSI a => Maybe a, SomeException)