Merge branch 'master' of git.logicalhacking.com:Isabelle_DOF/Isabelle_DOF
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@ -346,8 +346,11 @@ text\<open>
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\<^item> \<open>default_clause\<close> :
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\<^item> \<open>default_clause\<close> :
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\<^rail>\<open> '<=' '"' expr '"' \<close>
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\<^rail>\<open> '<=' '"' expr '"' \<close>
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\<^item> \<open>regexpr\<close> :
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\<^item> \<open>regexpr\<close> :
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\<^rail>\<open> class_id | '(' regexpr ')' | (regexpr '||' regexpr) | (regexpr '~~' regexpr)\<close>
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\<^rail>\<open> '\<lfloor>' class_id '\<rfloor>' | '(' regexpr ')' | (regexpr '||' regexpr) | (regexpr '~~' regexpr)
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| ('\<lbrace>' regexpr '\<rbrace>') | ( '\<lbrace>' regexpr '\<rbrace>\<^sup>*') \<close>
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regular expressions describe sequences of \<open>class_id\<close>s (and indirect sequences of document
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items corresponding to the \<open>class_id\<close>s). The constructors for alternative, sequence,
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repetitions and non-empty sequence follow in the top-down order of the above diagram.
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\<close>
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\<close>
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