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Deterministic and Nondeterministic Schemas A schema validating parser works by matching the structure of the underlying XML document with the referenced XML schema document. By compiling the schema, the parser gets enough information to determine whether a given node in the source XML document conforms to the layout depicted by the XSD. As the parser moves from one node to the next, two different situations can occur. Either the parser can unambiguously match the current node structure with a valid XSD sequence or it can't. If exactly one match is found, the process can continue. If no match is found, the source document does not follow the XML schema. Parsing stops, and an exception is raised. A schema in which the match between one XML node and one XSD sequence is unique (if any) is said to be deterministic. Our sample address schema is deterministic, and the SOM parser processes it successfully. Other flavors of XML schemas are called nondeterministic because the number of matches found can exceed one. In this case, the parser must look ahead to try to 105

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determine the correct sequence and identify the correct piece of PSVI information. Nondeterministic does not mean invalid, but not all parsers can successfully handle such schemas. The .NET Framework schema parser, for example, does not support nondeterministic schemas. All files written according to the following (valid) schema are inevitably rejected: < xml version="1.0" encoding="utf-8" > <xs:schema xmlns=""xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="address"> <xs:complexType> <xs:choice> <xs:sequence> <xs:element name="street" type="xs:string" /> <xs:element name="number" type="xs:string" /> <xs:element name="city" type="xs:string" /> <xs:element name="state" type="xs:string" /> <xs:element name="zip" type="xs:string" /> </xs:sequence> <xs:sequence> <xs:element name="street" type="xs:string" /> <xs:element name="number" type="xs:string" /> <xs:element name="city" type="xs:string" /> <xs:element name="state" type="xs:string" /> <xs:element name="zip" type="xs:string" /> <xs:element name="country" type="xs:string" /> </xs:sequence> </xs:choice> </xs:complexType> </xs:element> </xs:schema> The<xs:choice> element makes the schema inherently more prone to become nondeterministic. The <xs:choice>elements permits exactly one of the subsequent schema elements. However, when child elements are sequences, the schema automatically becomes nondeterministic. In the preceding XSD, as soon as the parser moves to the street node, it detects an ambiguity. What is the correct XmlSchemaSequence class to take into account The correct class can be determined only by looking a certain number of nodes ahead. In this very unfortunate case, the parser would need to look at least five nodes ahead. Some parsers support the forward-checking feature up to a fixed number of nodes; some do not. The .NET SOM parser requires the schema to be deterministic. Figure 313 shows what happens when the sample application ValidateDocument grapples with a nondeterministic schema.

Summary

Figure 3-13: .NET SOM parser complaints about the nondeterministic nature of the schema. Validating Against an XSD Document After this long digression into the XML Schema API in the .NET Framework, let's conclude this chapter by looking at what happens when the XmlValidatingReader class is called to operate on an XML file that includes, or references, an XML schema. The following code shows how to set up the XML validator class to work on XSD files: XmlTextReader _coreReader = new XmlTextReader(fileName); XmlValidatingReader reader XmlValidatingReader(_coreReader); reader.ValidationType = ValidationType.Schema; reader.ValidationEventHandler ValidationEventHandler(MyHandler); while(reader.Read()); When the ValidationType property is set to Schema, the parser tries to proceed anyway, regardless of the fact that the source file has no link to a schema file. An interesting phenomenon occurs when the XML schema is embedded in the XML document that is being validated. In this case, the schema appears as a constituent part of the source document. In particular, it is a direct child of the document root element. The schema is an XML subtree that is logically placed at the same level as the document to validate. A well-formed XML document can't have two roots, however. Thus an all-encompassing root node with two children, the schema and the document, must be created, as shown here: <wrapper> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="sample"> <xs:element name="book" type="xs:string" /> </xs:schema> <smp:book xmlns:smp="sample"> Applied XML Programming for Microsoft(r) .NET </smp:book> 107 += new = new

Whether you start with an Excel worksheet or with a SharePoint list template, by customizing lists you can make them work to meet your particular needs. In this chapter, we showed you how to modify an existing list by adding columns and changing the order of columns. We explored the various types of columns that are available in SharePoint, and the strengths of each one. We also examined the world of views, and how views can change your perspective in data. By showing and hiding columns; sorting, filtering, and grouping data; adding totals; selecting a style; and setting item limits, you can create a series of dynamic and useful views that give users entirely new ways to work with data. In 5, we re going to delve into calculations in SharePoint. Although they re not as flexible and easy to work with as Excel calculations, you ll find plenty of power to meet many of your calculation needs. And you if can t do what you need to do, you can always go back and review 3, which tells you how to export SharePoint lists to Excel.

</wrapper> The root element can't be successfully validated because there is no schema information about it. When the ValidationType property is set to Schema, the XmlValidatingReaderclass returns a warning for the root element if an in-line schema is detected, as shown in Figure 3-14. Be aware of this when you set up your validation code. A too-strong filter for errors could signal as incorrect a perfectly legal XML document if the XSD code is embedded.

Figure 3-14: The validating parser returns a warning when the ValidationType property is set to Schema and an in-line schema is used. Note The warning you get from XmlValidatingReader is only the tip of the iceberg. Although XML Schema as a format is definitely a widely accepted specification, the same can't be said for in-line schemas. An illustrious victim of this situation is the XML code you obtain from the WriteXml method of the DataSet object when the XmlWriteMode.WriteSchema option is set. The file you get has the XML schema in-line, but if you try to validate it using XmlValidatingReader, it does not work! In general, the guideline is to avoid in-line XML schemas whenever possible. This improves the bandwidth management (the schema is transferred one time at most) and shields you from bad surprises. As for the DataSet object, if you remove the schema to a separate file and reference it from within the DataSet object's serialized output, everything works just fine. Alternatively, with the XmlValidatingReader object, you can preload the schema in the schema cache and then proceed with the parsing of the source. We'll delve deeper into DataSet serialization issues in 9.

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