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! Use of the transformation files (extension .trans) !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !
! These files can be edited during a Thot session. They will be ! dynamically parsed when the transformation tool is required by ! the editor. So new transformations can be added while editing. ! Each file describes the transformation for the elements defined ! in the structure schema having the same name (Paragraphe.trans ! are the transformations for Paragraph elements defined in ! Paragraphe.S)
!
! Syntax of the transformation language !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !
! comments begin with !
!
! The file is a list of transformation rules, describing the context ! in wich the transformation is appliable, and rules to drive the ! transformation of context-matched elements. !
! A tranformation rule has four parts : ! TransRule :== 'TRANS' Name ';'

!              ['USES' Name < ',' Name ',' > ';' ]
!               'PATTERN' Pattern ';'
!               'RULES' Rule ';' <Rule ';'>
!               'END'
!
!     - the name of the transformation;
!     - the external structure schemas used in definition
!     - a source pattern for the contexte and structure definition
!     - and a list of rules each one terminated by a semi-colon ";"

!
! The name will appear in the transform menu. !
! The pattern gives of a specific organization of the elements ! to be transformed: it contains type name (as they are defined in S schema) ! and SGML-like syntax
! for the composition operators:

!     | for choice
!     , for sibling
!     + for sequence
!     ? for option
!     ( ) for grouping nodes

! The braces "{" "}" define the content of a node. ! The symbol "" is a token that matches any element type ! It is possible to rename a tag by preceeding it with a name ! followed by a colon ":"
!
! A rule expresses transformations to be applied to the elements ! identified in the pattern.
! A rule has two parts separated by the symbol ">":

!     - a source tag
!     - and a target tag list. This list is itself divided into
!       two parts separated by a colon":": 
!          the generation location path
!         * and the list of tags to be generated

! The dot symbol "." is used for descending in the tree structure. ! if the special token star "*" ends the list of tags to be ! generated, the source elment tag is not changed but this element ! can be moved in a different place in the destination. !
! Stephane.Bonhomme@inrialpes.fr - Oct. 1997


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