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Parser Schemas– Easy and Powerful parsing of XML-based languages

, 18 Oct 2005
An article on parsing XML files according to the specified schema.
<?xml version="1.0" encoding="utf-8"?>
<root>
  <!-- 
    Microsoft ResX Schema 
    
    Version 2.0
    
    The primary goals of this format is to allow a simple XML format 
    that is mostly human readable. The generation and parsing of the 
    various data types are done through the TypeConverter classes 
    associated with the data types.
    
    Example:
    
    ... ado.net/XML headers & schema ...
    <resheader name="resmimetype">text/microsoft-resx</resheader>
    <resheader name="version">2.0</resheader>
    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
        <value>[base64 mime encoded serialized .NET Framework object]</value>
    </data>
    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
        <comment>This is a comment</comment>
    </data>
                
    There are any number of "resheader" rows that contain simple 
    name/value pairs.
    
    Each data row contains a name, and value. The row also contains a 
    type or mimetype. Type corresponds to a .NET class that support 
    text/value conversion through the TypeConverter architecture. 
    Classes that don't support this are serialized and stored with the 
    mimetype set.
    
    The mimetype is used for serialized objects, and tells the 
    ResXResourceReader how to depersist the object. This is currently not 
    extensible. For a given mimetype the value must be set accordingly:
    
    Note - application/x-microsoft.net.object.binary.base64 is the format 
    that the ResXResourceWriter will generate, however the reader can 
    read any of the formats listed below.
    
    mimetype: application/x-microsoft.net.object.binary.base64
    value   : The object must be serialized with 
            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
            : and then encoded with base64 encoding.
    
    mimetype: application/x-microsoft.net.object.soap.base64
    value   : The object must be serialized with 
            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
            : and then encoded with base64 encoding.

    mimetype: application/x-microsoft.net.object.bytearray.base64
    value   : The object must be serialized into a byte array 
            : using a System.ComponentModel.TypeConverter
            : and then encoded with base64 encoding.
    -->
  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xsd:element name="root" msdata:IsDataSet="true">
      <xsd:complexType>
        <xsd:choice maxOccurs="unbounded">
          <xsd:element name="metadata">
            <xsd:complexType>
              <xsd:sequence>
                <xsd:element name="value" type="xsd:string" minOccurs="0" />
              </xsd:sequence>
              <xsd:attribute name="name" use="required" type="xsd:string" />
              <xsd:attribute name="type" type="xsd:string" />
              <xsd:attribute name="mimetype" type="xsd:string" />
            </xsd:complexType>
          </xsd:element>
          <xsd:element name="assembly">
            <xsd:complexType>
              <xsd:attribute name="alias" type="xsd:string" />
              <xsd:attribute name="name" type="xsd:string" />
            </xsd:complexType>
          </xsd:element>
          <xsd:element name="data">
            <xsd:complexType>
              <xsd:sequence>
                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
              </xsd:sequence>
              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
            </xsd:complexType>
          </xsd:element>
          <xsd:element name="resheader">
            <xsd:complexType>
              <xsd:sequence>
                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
              </xsd:sequence>
              <xsd:attribute name="name" type="xsd:string" use="required" />
            </xsd:complexType>
          </xsd:element>
        </xsd:choice>
      </xsd:complexType>
    </xsd:element>
  </xsd:schema>
  <resheader name="resmimetype">
    <value>text/microsoft-resx</value>
  </resheader>
  <resheader name="version">
    <value>2.0</value>
  </resheader>
  <resheader name="reader">
    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
  </resheader>
  <resheader name="writer">
    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
  </resheader>
  <data name="ExceptionMsg_Formatable1_InvalidDocument">
    <value xml:space="preserve">This document does not conform to the specified parser schema. {0}</value>
  </data>
  <data name="ExceptionMsg_Formatable1_InvalidRuleImpl">
    <value xml:space="preserve">The '{0}' rule implementation is invalid. Contact application vendor.</value>
  </data>
  <data name="ExceptionMsg_Formatable1_NoValueSupplied">
    <value xml:space="preserve">Cannot validate value of node '{0}' because the rule does not captured any value. Set NodeValueOptions to GetValue | RequireValue.</value>
  </data>
  <data name="ExceptionMsg_Formatable1_ParentNodeNotFound">
    <value xml:space="preserve">Parent node '{0}' was not found.</value>
  </data>
  <data name="ExceptionMsg_Formatable1_SchemaCannotBeEvaluated">
    <value xml:space="preserve">An error occurred during the schema evaluation. {0}</value>
  </data>
  <data name="ExceptionMsg_Formatable2_AtLeastOneOptionalChildExpected">
    <value xml:space="preserve">Element '{0}' requires at least one child node. Parent markup: {1}</value>
  </data>
  <data name="ExceptionMsg_Formatable2_MissingNodeValue">
    <value xml:space="preserve">Element '{0}' is empty but is required to contain a value. Parent markup: {1}</value>
  </data>
  <data name="ExceptionMsg_Formatable2_ValueIsInvalid">
    <value xml:space="preserve">Value '{0}' is invalid for the '{1}' node.</value>
  </data>
  <data name="ExceptionMsg_Formatable3_RequiredChildNotFound">
    <value xml:space="preserve">Required child node '{0}' of node '{1}' was not found. Parent markup: {2}</value>
  </data>
  <data name="ExceptionMsg_LinkAlreadyExists">
    <value xml:space="preserve">The rule is already linked to this rule.</value>
  </data>
  <data name="ExceptionMsg_LinkNotFound">
    <value xml:space="preserve">The rule has not been linked to this rule.</value>
  </data>
  <data name="ExceptionMsg_MaximumChildsCountToMatchOptionMisunderstood">
    <value xml:space="preserve">0 optional child nodes required at the same time with the 'At least one optional child required' option.</value>
  </data>
  <data name="ExceptionMsg_NullArgumentsPassed">
    <value xml:space="preserve">None of passed arguments can be null.</value>
  </data>
  <data name="ExceptionMsg_SchemaAlreadyEvaluated">
    <value xml:space="preserve">Provided schema was already evaluated.</value>
  </data>
  <data name="ExceptionMsg_TextElementShouldNotHaveChildNodes">
    <value xml:space="preserve">The text element must not have child nodes. It is supposed to have text content only.</value>
  </data>
</root>

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About the Author

Tomas Deml

Czech Republic Czech Republic
I'm a student of the Low-voltage Electrical Engineering specialized on Computing from the Czech republic.
 
I'm a C# kind of guy, fan of .NET.
 
I've formed a programming group called 'Comnicate!'. Currently the only member of the group is myself. Wink | ;-)

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