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# 13. File Naming Conventions and Application Name Space

Any ASIS application depends on the ASIS interface components; an ASIS application programmer thus needs to be alert to (and to avoid) clashes with the names of these components.

ASIS-for-GNAT includes the full specification of the ASIS Standard, and also adds the following children and grandchildren of the root `Asis` package:

- `Asis.Extensions` hierarchy (the source file names start with ``asis-extensions'`) defines some useful ASIS extensions, see ASIS Reference Manual for more details.

- `Asis.Set_Get` (the source files ``asis-set_get.ad(b|s)'` respectively) contains the access and update subprograms for the implementation of the main ASIS abstractions defined in `Asis`.

- `Asis.Text.Set_Get` (the source files ``asis-text-set_get.ad(b|s)'` respectively) contains the access and update subprograms for the implementation of the ASIS abstractions defined in `Asis.Text`;

All other ASIS-for-GNAT Ada implementation components belong to the hierarchy rooted at the package `A4G` (which comes from "ASIS-for-GNAT").

ASIS-for-GNAT also incorporates the following GNAT components as a part of the ASIS implementation:

       Alloc
       Atree
       Casing
       Csets
       Debug
       Einfo
       Elists
       Fname
       Gnatvsn
       Hostparm
       Krunch
       Lib
         Lib.List
         Lib.Sort
       Namet
       Nlists
       Opt
       Output
       Repinfo
       Scans
       Sinfo
       Sinput
       Snames
       Stand
       Stringt
       Table
       Tree_In
       Tree_Io
       Types
       Uintp
       Uname
       Urealp
       Widechar

Therefore, in your ASIS application you should not add children at any level of the `Asis` or `A4G` hierarchies, and you should avoid using any name from the list of the GNAT component names above.

All Ada source files making up the ASIS implementation for GNAT (including the GNAT components being a part of ASIS-for-GNAT) follow the GNAT file name conventions without any name "krunch"ing.

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