Documents can be valid (xml documents).Logical formLearned from3 sentences. A (xml id) can be valid.Logical formLearned from3 sentences. A sender of a request can be valid.Logical formLearned from3 sentences. A (source address information) can be valid.Logical formLearned from3 sentences. A digital certificate can be valid.Logical formLearned from3 sentences. An ipr can be valid.Logical formLearned from3 sentences. An (input message) can be valid.Logical formLearned from3 sentences. Subsets can be valid.Logical formLearned from3 sentences. (Sgml documents) can be valid.Logical formLearned from3 sentences. A (document instance) can be valid.Logical formLearned from3 sentences. Some tags can be valid.Logical formLearned from3 sentences. A (document instance) can be valid.Logical formLearned from3 sentences. An electronic submission can be valid.Logical formLearned from3 sentences. A (resource definition) can be valid.Logical formLearned from3 sentences. A (replacement element) can be valid.Logical formLearned from3 sentences.