- From: Michael Kay <mike@saxonica.com>
- Date: Tue, 17 Feb 2009 10:34:51 -0000
- To: "'Bharath Kumar Reddy T'" <bharathkr@huawei.com>, <xmlschema-dev@w3.org>
- Cc: <ranjit@huawei.com>, <ashutosh_p@huawei.com>
- Message-ID: <946590392BEF46ADBF72E2C89D6CEEF4@Sealion>
Your first example violates the Unique particle attribute constraint (UPA) because without lookahead, if there are three a elements then the parser doesn't know whether the second a belongs with the first particle or the second. That's because the variable number of repetitions is on the first particle. In your second example the variable number of repetitions is on the last particle, so there is no ambiguity: the first a element is attributed to the first particle, all remaining a elements are attributed to the second. >Also please tell me in some detail about the non-deterministicity of a content model. Sorry, you're being overoptimistic there. Answering questions on a forum is one thing, writing essays is another. Please read some books, and if you have specific questions, you can ask them here. Michael Kay http://www.saxonica.com/ _____ From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On Behalf Of Bharath Kumar Reddy T Sent: 17 February 2009 10:15 To: xmlschema-dev@w3.org Cc: ranjit@huawei.com; ashutosh_p@huawei.com Subject: Doubt in non-deterministic content model Hi.. The following schema is non deterministic since the parser will not determine whether it should compare the element in the instance document with 1st element declaration or 2nd element declaration. <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:complexType name="foo"> <xs:sequence> <xs:element name="a" maxOccurs="2"/> <xs:element name="a"/> </xs:sequence> </xs:complexType> </xs:schema> For the following schema also same scenario is present. But one of the xml Parsers is not giving any error. Can any body tell me whether the following schema is non-deterministic or not? Also please tell me in some detail about the non-deterministicity of a content model. <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <!-- restriction xs:any to a sequence --> <xs:complexType name="base"> <xs:sequence> <xs:any namespace="##any"/> <xs:sequence> <xs:element name="a" minOccurs="0"/> </xs:sequence> </xs:sequence> </xs:complexType> <xs:complexType name="derived"> <xs:complexContent> <xs:restriction base="base"> <xs:sequence> <xs:element name="a" type="xs:string"/> <xs:element name="a" type="xs:string" minOccurs="0"/> </xs:sequence> </xs:restriction> </xs:complexContent> </xs:complexType> </xs:schema> Thanks and Regards, Bharath.
Received on Tuesday, 17 February 2009 10:35:38 UTC