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## 3 Structuring Rules

We set up a representative corpus in order to infer a set of rules able to decide if a segment s is (or is not) under the scope of a conditional segment c. 3.1 Material & method The training corpus consists of 25 French Practice Guidelines (about 150 000 words, see http://anaes.fr). This corpus has been annotated by a domain expert, who had to manually recognize conditions and recommendations, and link them according to the tree structure described in 2.2. We have built on this basis a set of examples, each example being a couple (c, s) where c is a conditional segment and s is a segment under the scope of c (positive examples) or not (negative examples). All the examples are represented by a set of 17 potential interesting linguistic features. The list of these features has been identified from the relevant literature (e.g. [6] [7] [8]) and a manual study of the practice guidelines. More precisely, the features belong to the 4 following categories: 1) Material text structure. Let's take the feature: "has_the_same_visual_position*(c,s)*". Its value for the couple *(a,d)* in Figure 1 is "true" because (a) and (d) are both at the beginning of a paragraph. Another attribute concerns the location of the condition: "is detached*(c)".* The value of this feature for (c) in the figure 1 is "detached" because (c) is located at the sentence-initial position. 2) Lexical **relations**. Let's take the feature "have_terms_with_an antonymic_relation(c,s)". Its value is "true" for the couple *(a,d)* because the terms immunodéprimé and *non immunodéprimé* are antonyms. 3) Discourse **connectors**. Let's take the feature "begins_with_a_coordination_ marker (s)". Its value is "true" for *(a,3)* because the proposition begins with *De même (also...)*. 