xtc — registers, unregisters and queries XTC components in a repository


xtc [-r rep | --repository rep] [i rep | import rep] [r | register] [-t name | --tool name] [-l loc | --location loc] [-V name | --Version name] [query | q] [-a | --all] [-L | --Location] [-R | --Repository] [--verbose int] [-h | -? | --help] [--about] [--version]


The Stratego/XT component model is called XTC. It allows developers to compose XT components (Stratego programs) together, creating new components in a flexible, scalable and modular way. Components live together in XTC repositories, which have an internal directory structure.

The xtc tool is used to administer components in an XTC repository. It can add and remove components from a repository as well as inspect repositories.


Repository Manipulation Options

-r rep, --repository rep

The repository to work on. rep is the base path to the repository. This option is mandatory.

i rep, import rep

Import the repository in rep.

This command will import the entire contents (all components) of the repository rep.

r, register

Register a file in the repository. This option must be followed by -t, -V and -l.

-t name, --tool name

Name of the tool to register (r command) or query for (q command).

-l loc, --location name

Location inside the repository to place a new tool. Used with the register (r) command.

-V num, --Version num

Version of the tool to register (r command) or query for (q).

q, query

Queries the repository for all installed components. May be used with -L.

By using the -a, -t and -V option, filtering may be done.

-a, --all

List all registered tools. Used with the q command.

-L, --Location

List only locations. Used with the q command.

-R, --Repository

List the location of the repository as a Bash-compatible shell environment variable setting.

Common Input/Output Options

-i file

The input term given by the file name file.

In the absence of the -i option, input will be read from stdin.

-o file

The output will be written to the file given by the file name file.

In the absence of the -o option, output will be written to stdout.


The output will be written in the binary (BAF) ATerm format.

ATerms in the BAF format require a lot less space than ones in the TAF format, but the Java ATerm library does not currently support baf ATerms. ATerms in the baf format is the preferred format of exchange between Stratego tools.

Common Debugging Options


See --version.

-h, -?, --help

Display usage information.

--keep int

Keep intermediate results produced by the internal stages in the pretty-printing process. This is only useful for debugging. A high value of int indicates increased eagerness for keeping intermediate results.

Default setting is 0, indicating that no intermediates will be kept.

-S, --silent

Silent execution. Same as --verbose 0.

--verbose int

Set verbosity level to numerical value int. The higher the number, the more information about pp-aterm's inner workings are printed.

Alternatively, int can be set to either of the following verbosity levels, given in increasing order of verbosity: emergency, alert, critical, error, warning, notice, info, debug, vomit.


Displays the tool name and version.


Consider the following command.

$ xtc -r /usr/share/StrategoXT/XTC register -t sglr -l /bin -V 3.8

This will register version 3.8 of sglr with the XTC repository located in /usr/share/StrategoXT. It will be placed in the /bin directory inside the repository.

Note that the generic Makefile.xt provided by AutoXT automatically registers all installed tools with the package repository.

XTC repositories can be used to find the installation location of a tool without needing to know all the installation paths. For example, the following query can be used to find out where sglr is installed:

$ xtc -r /usr/share/StrategoXT/XTC query -t sglr
sglr (3.8) : /bin/sglr

An existing repository can be inherited by importing it:

$ xtc -r /home/user/share/tiger/XTC import /usr/share/StrategoXT/XTC

Reporting Bugs

Please report bugs to


Copyright (C) 2002-2005 Eelco Visser

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.