Types, methods and variables used in the X-script you may declare in the auxiliary element "xd:declaration":
<xd:declaration> type isbn int(10000000, 999999999); type published gYear(); Date today = now(); void message(String s) { outln(s); } </xd:declaration> <Book xd:script="init message('Started ' + today); finally message('Process finished');" isbn="isbn();" published="optional published();" > <Author xd:script="occurs *" > <xd:text> string() </xd:text> </Author> <Title> <xd:text> string() </xd:text> </Title> </Book>
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