Mercurial > repos > IBBoard

annotate Xml/XmlTools.cs @ 116:07660ac09a5f

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Merge heads, but keep de0ed24eb961/IBBoard
author IBBoard <dev@ibboard.co.uk>
date Tue, 26 Jun 2012 20:09:01 +0100
parents de0ed24eb961 7ca4acc659bb
children
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1 // This file (XmlTools.cs) is a part of the IBBoard library and is copyright 2009 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.
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4 //
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5 using System;
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6 using System.Globalization;
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7 using System.Text.RegularExpressions;
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8 using System.Xml;
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9 using System.Xml.Schema;
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10 using System.Reflection;
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11 using System.IO;
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12
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13 namespace IBBoard.Xml
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14 {
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15 /// <summary>
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16 /// Some basic tools for handling XML files and retrieving their values
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17 /// </summary>
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18 public class XmlTools
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19 {
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20 private static Regex idRegex;
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21 private static Regex multiUnderscoreRegex;
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22 private static NumberFormatInfo doubleFormat;
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23
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24 /// <summary>
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25 /// Gets the value of an attribute of an element as a boolean. Throws a FormatException if the attribute is not a boolean.
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26 /// </summary>
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27 /// <param name="elem">
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28 /// The <see cref="XmlElement"/> to get the attribute value of
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29 /// </param>
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30 /// <param name="attributeName">
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31 /// The name of the attribute to get as a boolean
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32 /// </param>
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33 /// <returns>
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34 /// The value of the attribute as an boolean
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35 /// </returns>
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36 public static bool GetBoolValueFromAttribute(XmlElement elem, string attributeName)
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37 {
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38 try
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39 {
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40 return bool.Parse(elem.GetAttribute(attributeName));
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41 }
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42 catch (FormatException)
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43 {
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44 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid boolean", attributeName, elem.Name, elem.GetAttribute("id")));
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45 }
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46 }
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47
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48 /// <summary>
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49 /// Gets the value of an attribute of an element as an integer. Throws a FormatException if the attribute is not an integer.
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50 /// </summary>
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51 /// <param name="elem">
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52 /// The <see cref="XmlElement"/> to get the attribute value of
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53 /// </param>
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54 /// <param name="attributeName">
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55 /// The name of the attribute to get as an integer
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56 /// </param>
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57 /// <returns>
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58 /// The value of the attribute as an integer
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59 /// </returns>
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60 public static int GetIntValueFromAttribute(XmlElement elem, string attributeName)
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61 {
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62 try
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63 {
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64 return int.Parse(elem.GetAttribute(attributeName));
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65 }
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66 catch (FormatException)
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67 {
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68 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid number", attributeName, elem.Name, elem.GetAttribute("id")));
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69 }
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70 }
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72 /// <summary>
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73 /// Gets the value of an attribute of an element as a double. Throws a FormatException if the attribute is not a double.
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74 /// </summary>
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75 /// <param name="elem">
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76 /// The <see cref="XmlElement"/> to get the attribute value of
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77 /// </param>
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78 /// <param name="attributeName">
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79 /// The name of the attribute to get as a double
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80 /// </param>
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81 /// <returns>
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82 /// The value of the attribute as an double
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83 /// </returns>
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84 public static double GetDoubleValueFromAttribute(XmlElement elem, string attributeName)
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85 {
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86 double doubleVal = double.NaN;
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87 string attribValue = elem.GetAttribute(attributeName);
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88
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89 if (attribValue == "INF")
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90 {
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91 doubleVal = double.PositiveInfinity;
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92 }
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93 else
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94 {
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95 try
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96 {
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97 return double.Parse(attribValue, GetNumberFormatInfo());
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98 }
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99 catch (FormatException)
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100 {
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101 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid number", attributeName, elem.Name, elem.GetAttribute("id")));
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102 }
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103 }
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104
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105 return doubleVal;
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106 }
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107
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108 public static T GetEnumValueFromAttribute<T>(XmlElement elem, string attributeName)
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109 {
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110 return GetEnumValueFromAttribute<T>(elem, attributeName, true);
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111 }
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112
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113 public static T GetEnumValueFromAttribute<T>(XmlElement elem, string attributeName, bool ignoreCase)
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114 {
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115 string attribValue = elem.GetAttribute(attributeName);
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116
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117 try
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118 {
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119 return EnumTools.ParseEnum<T>(attribValue, ignoreCase);
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120 }
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121 catch (ArgumentException)
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122 {
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123 throw new FormatException(String.Format("Attribute '{0}' with value {1} for {2} with ID '{3}' was not a valid {4} enum", attributeName, attribValue, elem.Name, elem.GetAttribute("id"), typeof(T).Name));
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124 }
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125 }
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127 private static NumberFormatInfo GetNumberFormatInfo()
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128 {
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129 if (doubleFormat == null)
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130 {
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131 doubleFormat = NumberFormatInfo.InvariantInfo;
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132 }
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133
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134 return doubleFormat;
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135 }
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136
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137 private static Regex GetIdRegex()
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138 {
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139 if (idRegex == null)
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140 {
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141 idRegex = new Regex("[^a-zA-Z0-9:\\._-]+");
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142 }
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143
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144 return idRegex;
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145 }
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146
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147 private static Regex GetMultiUnderscoreRegex()
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148 {
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149 if (multiUnderscoreRegex == null)
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150 {
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151 multiUnderscoreRegex = new Regex("_{2,}");
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152 }
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153
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154 return multiUnderscoreRegex;
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155 }
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156
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157 /// <summary>
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158 /// Gets a valid XML ID for a given string that does not contain accented and non-ASCII characters. Matches the allowed characters
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159 /// in the XML spec (http://www.w3.org/TR/xml/#NT-NameStartChar) where the characters do not use Unicode character codes. If the ID
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160 /// starts with an invalid character then it will be prepended with an underscore.
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161 /// </summary>
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162 /// <param name="str">
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163 /// The <see cref="System.String"/> to turn in to a valid ID
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164 /// </param>
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165 /// <returns>
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166 /// The valid XML ID with all series of invalid characters replaced with an underscore
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167 /// </returns>
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168 public static string GetAsciiXmlIdForString(string str)
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169 {
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170 string id = GetIdRegex().Replace(str, "_");
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171 id = GetMultiUnderscoreRegex().Replace(id, "_");
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172
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173 if (!IdStartsWithValidCharacter(id))
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174 {
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175 id = "_" + id;
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176 }
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177
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178 return id;
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179 }
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180
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181 private static bool IdStartsWithValidCharacter(string id)
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182 {
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183 bool valid = false;
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184
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185 if (id.Length > 0)
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186 {
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187 char firstChar = id[0];
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188 valid = ('A' <= firstChar && firstChar <= 'Z') || ('a' <= firstChar && firstChar <= 'z') || firstChar == '_' || firstChar == ':';
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189 }
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190
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191 return valid;
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192 }
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193
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194 public static void AddSchemaToSetFromResource(XmlSchemaSet schemaSet, string targetNamespace, Assembly assm, string id)
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195 {
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196 Stream resStream = assm.GetManifestResourceStream(id);
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197 schemaSet.Add(targetNamespace, new XmlTextReader(resStream));
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198 }
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199 }
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200 }