The language hierarchy

The language hierarchy is the tree of directories and files that make up the language environment. Although you may create a language hierarchy anywhere you like, we suggest first creating a directory:

$HOME/contrib

that will contain all language hierarchies. We call this directory the contrib directory. To create the Exp hierarchy, go to the contrib directory and type after the unix prompt (here %cahors):

cahors%centaur-language Exp contrib

This command creates almost all the files necessary in a language hierarchy. You will be asked for information concerning:

• pretty printers: Enter the names basic env.
• semantics tools: Enter the name interpreter.
• message modules: Enter the name interpreter.

N.B. This command indicates a few lines of resources that must be included in the .centaur.rdb file of your home directory:

Centaur.Formalisms: (... Exp ...)
...
Centaur.Exp*Root: user
Centaur.Exp.Database.Location: contrib/Exp/syntax/Exp.rdb

where ... indicates the possible presence of other information.

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