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gbaseattribute.cs

/* Copyright (c) 2006-2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* Change history
* Oct 13 2008  Joe Feser       joseph.feser@gmail.com
* Converted ArrayLists and other .NET 1.1 collections to use Generics
* Combined IExtensionElement and IExtensionElementFactory interfaces
* 
*/
#region Using directives
using System;
using System.Collections;
using System.Text;
using System.Xml;
using Google.GData.Client;
#endregion

namespace Google.GData.GoogleBase {

    ///////////////////////////////////////////////////////////////////////
    /// <summary>Identifiers for standard Google Base attribute types.
    /// All non-standard types share the type otherType</summary>
    ///////////////////////////////////////////////////////////////////////
    public enum StandardGBaseAttributeTypeIds
    {
        /// <summary>Id of the standard type <c>text</c></summary>
        textType,
        /// <summary>Id of the standard type <c>boolean</c></summary>
        booleanType,

        /// <summary>Id of the standard type <c>location</c></summary>
        locationType,

        /// <summary>Id of the standard type <c>url</c></summary>
        urlType,

        /// <summary>Id of the standard type <c>int</c></summary>
        intType,

        /// <summary>Id of the standard type <c>float</c></summary>
        floatType,

        /// <summary>Id of the standard type <c>number</c></summary>
        numberType,

        /// <summary>Id of the standard type <c>intUnit</c></summary>
        intUnitType,

        /// <summary>Id of the standard type <c>floatUnit</c></summary>
        floatUnitType,

        /// <summary>Id of the standard type <c>numberUnit</c></summary>
        numberUnitType,

        /// <summary>Id of the standard type <c>date</c></summary>
        dateType,

        /// <summary>Id of the standard type <c>dateTime</c></summary>
        dateTimeType,

        /// <summary>Id of the standard type <c>dateTimeRange</c></summary>
        dateTimeRangeType,

        /// <summary>Id of the standard type <c>shipping</c></summary>
        shippingType,

        /// <summary>An attribute type that could not be recognized by
        /// the library. See the attribute name.</summary>
        otherType
    }

    ///////////////////////////////////////////////////////////////////////
    /// <summary>Object representation of Google Base attribute types.
    ///
    /// To get GBaseAttributeType instance, use one of the predefined
    /// constants or call GBaseAttributeType.ForName(string)
    /// </summary>
    ///////////////////////////////////////////////////////////////////////
00090     public class GBaseAttributeType
    {
        private readonly string name;
        private readonly StandardGBaseAttributeTypeIds id;
        private readonly GBaseAttributeType supertype;

        /// <summary>Text attributes.</summary>
00097         public static readonly GBaseAttributeType Text =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.textType,
                                   "text");

        /// <summary>Boolean attributes.</summary>
00102         public static readonly GBaseAttributeType Boolean =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.booleanType,
                                   "boolean");

        /// <summary>Location attributes, as a free string.</summary>
00107         public static readonly GBaseAttributeType Location =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.locationType,
                                   "location");

        /// <summary>Url attributes.</summary>
00112         public static readonly GBaseAttributeType Url =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.urlType,
                                   "url");

        /// <summary>Number attribute: a float or an int.</summary>
00117         public static readonly GBaseAttributeType Number =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.numberType,
                                   "number");

        /// <summary>Integer attribute, a subtype of Number.</summary>
00122         public static readonly GBaseAttributeType Int =
            new GBaseAttributeType(Number,
                                   StandardGBaseAttributeTypeIds.intType,
                                   "int");

        /// <summary>Float attribute, a subtype of Number.</summary>
00128         public static readonly GBaseAttributeType Float =
            new GBaseAttributeType(Number,
                                   StandardGBaseAttributeTypeIds.floatType,
                                   "float");

        /// <summary>Number attribute with a unit ("12 km"). A supertype
        /// of FloatUnit and IntUnit.</summary>
00135         public static readonly GBaseAttributeType NumberUnit =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.numberUnitType,
                                   "numberUnit");

        /// <summary>Int attribute with a unit, a subtype of NumberUnit.</summary>
00140         public static readonly GBaseAttributeType IntUnit =
            new GBaseAttributeType(NumberUnit,
                                   StandardGBaseAttributeTypeIds.intUnitType,
                                   "intUnit");

        /// <summary>Float attribute with a unit, a subtype of NumberUnit.</summary>
00146         public static readonly GBaseAttributeType FloatUnit =
            new GBaseAttributeType(NumberUnit,
                                   StandardGBaseAttributeTypeIds.floatUnitType,
                                   "floatUnit");

        /// <summary>A time range, with a starting and an end date/time, a
        /// supertype of DateTime and Date. For example:
        /// "2006-01-01T12:00:00Z 2006-01-02T14:00:00Z"
        ///
        /// Empty time ranges are considered equivalent to DateTime.</summary>
00156         public static readonly GBaseAttributeType DateTimeRange =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.dateTimeRangeType,
                                   "dateTimeRange");

        /// <summary>A date, a subtype of DateTime and DateTimeRange.</summary>
00161         public static readonly GBaseAttributeType Date =
            new GBaseAttributeType(DateTimeRange,
                                   StandardGBaseAttributeTypeIds.dateType,
                                   "date");

        /// <summary>A date and a time, a subtype of DateTimeRange.</summary>
00167         public static readonly GBaseAttributeType DateTime =
            new GBaseAttributeType(Date,
                                   StandardGBaseAttributeTypeIds.dateTimeType,
                                   "dateTime");

        /// <summary>A Shipping object.</summary>
00173         public static readonly GBaseAttributeType Shipping =
            new GBaseAttributeType(StandardGBaseAttributeTypeIds.shippingType,
                                   "shipping");


        /// <summary>All standard attribute types.</summary>
00179         public static readonly GBaseAttributeType[] AllStandardTypes = {
                    Text, Boolean, Location, Url,
                    Int, Float, Number,
                    IntUnit, FloatUnit, NumberUnit,
                    Date, DateTime, DateTimeRange
                };

        private static readonly IDictionary StandardTypesDict = new Hashtable();
        static GBaseAttributeType()
        {
            foreach(GBaseAttributeType type in AllStandardTypes)
            {
                StandardTypesDict.Add(type.Name, type);
            }
        }

        private GBaseAttributeType(GBaseAttributeType supertype,
                                   StandardGBaseAttributeTypeIds id,
                                   string name)
        {
            this.supertype = supertype;
            this.name = name;
            this.id = id;
        }

        private GBaseAttributeType(StandardGBaseAttributeTypeIds id, string name)
                : this(null, id, name)
        {

        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Get or create an attribute with the given name.
        /// If the name corresponds to a standard attribute, the global
        /// instance will be returned. Otherwise, a new GBaseAttributeType
        /// with Id = otherType will be created.</summary>
        ///////////////////////////////////////////////////////////////////////
00216         public static GBaseAttributeType ForName(String name)
        {
            if (name == null)
            {
                throw new ArgumentNullException("name");
            }
            GBaseAttributeType standard =
                StandardTypesDict[name] as GBaseAttributeType;
            if (standard != null)
            {
                return standard;
            }

            return new GBaseAttributeType(StandardGBaseAttributeTypeIds.otherType,
                                          name);
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Returns the attribute name.</summary>
        ///////////////////////////////////////////////////////////////////////
00236         public override string ToString()
        {
            return name;
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Compares two types by comparing their names.</summary>
        ///////////////////////////////////////////////////////////////////////
00244         public override bool Equals(object o)
        {
            if (Object.ReferenceEquals(o, this))
            {
                return true;
            }

            if (!(o is GBaseAttributeType))
            {
                return false;
            }

            GBaseAttributeType other = o as GBaseAttributeType;

            if (other.id == id)
            {
                if (other.id == StandardGBaseAttributeTypeIds.otherType)
                {
                    return name.Equals(other.name);
                }
                return true;
            }
            return false;
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Generates a hash code for this element that is
        /// consistent with its Equals() method.</summary>
        ///////////////////////////////////////////////////////////////////////
00273         public override int GetHashCode()
        {
            if (id == StandardGBaseAttributeTypeIds.otherType)
            {
                return 11 + name.GetHashCode();
            }
            else
            {
                return (int)id;
            }
        }


        ///////////////////////////////////////////////////////////////////////
        /// <summary>Checks whether this object is a supertype or the
        /// same as another type.</summary>
        /// <param name="subtype">other attribute type.</param>
        ///////////////////////////////////////////////////////////////////////
00291         public bool IsSupertypeOf(GBaseAttributeType subtype)
        {
            if (this == subtype)
            {
                return true;
            }
            GBaseAttributeType otherSupertype = subtype.Supertype;
            if (otherSupertype == null)
            {
                return false;
            }
            return IsSupertypeOf(otherSupertype);
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Type name</summary>
        ///////////////////////////////////////////////////////////////////////
        public string Name
00309         {
            get
            {
                return name;
            }
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Type identifier, otherType for nonstandard types.</summary>
        ///////////////////////////////////////////////////////////////////////
        public StandardGBaseAttributeTypeIds Id
00320         {
            get
            {
                return id;
            }
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>This type's supertype or null.</summary>
        ///////////////////////////////////////////////////////////////////////
        public GBaseAttributeType Supertype
00331         {
            get
            {
                return supertype;
            }
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Comparison based on the Equals() method.</summary>
        ///////////////////////////////////////////////////////////////////////
00341         public static bool operator ==(GBaseAttributeType a, GBaseAttributeType b)
        {
            if (Object.ReferenceEquals(a, b))
            {
                return true;
            }

            if (((object)a == null) || ((object)b == null))
            {
                return false;
            }

            return a.Equals(b);
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Comparison based on the Equals() method.</summary>
        ///////////////////////////////////////////////////////////////////////
00359         public static bool operator !=(GBaseAttributeType a, GBaseAttributeType b)
        {
            return !(a == b);
        }
    }


    ///////////////////////////////////////////////////////////////////////
    /// <summary>Extension element corresponding to a g: tag.
    /// This element contains the logic to convert a g: tag to and from
    /// XML.
    ///
    /// It is usually not accessed through
    /// <see href="GBaseAttributes">GBaseAttributes</see>.
    /// </summary>
    ///////////////////////////////////////////////////////////////////////
00375     public class GBaseAttribute : IExtensionElementFactory
    {
        private static readonly char[] kXmlWhitespaces = { ' ', '\t', '\n', '\r' };
        private string name;
        private GBaseAttributeType type;
        private bool isPrivate;
        /// <summary>Content, null if subElements != null.</summary>
00382         private string content;
        private string adjustedValue;
        private string adjustedName;

        /// <summary>Dictionary of: subElementName x subElementValue.
        /// Null if content != null</summary>
00388         private IDictionary subElements;


        ///////////////////////////////////////////////////////////////////////
        /// <summary>Creates an empty GBaseAttribute.</summary>
        ///////////////////////////////////////////////////////////////////////
00394         public GBaseAttribute()
        {
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Creates a GBaseAttribute with a name and an undefined
        ///  type.</summary>
        /// <param name="name">attribute name</param>
        ///////////////////////////////////////////////////////////////////////
00403         public GBaseAttribute(String name)
                : this(name, null, null)
        {
        }


        ///////////////////////////////////////////////////////////////////////
        /// <summary>Creates a GBaseAttribute with a name and a type.</summary>
        /// <param name="name">attribute name</param>
        /// <param name="type">attribute type or null if unknown</param>
        ///////////////////////////////////////////////////////////////////////
00414         public GBaseAttribute(String name, GBaseAttributeType type)
                : this(name, type, null)
        {
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Creates a GBaseAttribute</summary>
        /// <param name="name">attribute name</param>
        /// <param name="type">attribute type or null if unknown</param>
        /// <param name="content">value</param>
        ///////////////////////////////////////////////////////////////////////
00425         public GBaseAttribute(String name, GBaseAttributeType type, String content)
        {
            this.name = name;
            this.type = type;
            this.content = content;
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Attribute name</summary>
        ///////////////////////////////////////////////////////////////////////
        public string Name
00436         {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Attribute type</summary>
        ///////////////////////////////////////////////////////////////////////
        public GBaseAttributeType Type
00451         {
            get
            {
                return type;
            }
            set
            {
                type = value;
            }
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Attribute content, as a string.</summary>
        ///////////////////////////////////////////////////////////////////////
        public string Content
00466         {
            get
            {
                return content;
            }
            set
            {
                content = value;
            }
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Private access (XML attribute access="private")</summary>
        ///////////////////////////////////////////////////////////////////////
        public bool IsPrivate
00481         {
            get
            {
                return isPrivate;
            }
            set
            {
                isPrivate = value;
            }
        }


        ///////////////////////////////////////////////////////////////////////
        /// <summary>A better name for this attribute, recommended by 
        /// Google (when adjustments are turned on)</summary>
        ///////////////////////////////////////////////////////////////////////
        public string AdjustedName
00498         {
            get
            {
                return adjustedName;
            }
            set
            {
                adjustedName = value;
            }
        }


        ///////////////////////////////////////////////////////////////////////
        /// <summary>A better value for this string attribute, recommended by 
        /// Google (when adjustments are turned on)</summary>
        ///////////////////////////////////////////////////////////////////////
        public string AdjustedValue
00515         {
            get
            {
                return adjustedValue;
            }
            set
            {
                adjustedValue = value;
            }
        }

        //////////////////////////////////////////////////////////////////////
        /// <summary>Accesses sub-elements.
        ///
        /// Sub-elements are XML elements put inside the attribute
        /// tag. Such as:
        /// &lt;g:shipping&gt;
        ///   &lt;g:country&gt;FR&lt;/g:country&gt;
        ///   &lt;g:price&gt;12 EUR&lt;/g:price&gt;
        /// &lt;/g:shipping&gt;
        ///
        /// An attribute cannot contain both sub-elements and text (content)
        /// </summary>
        //////////////////////////////////////////////////////////////////////
        public string this[string subElementName]
00540         {
            get
            {
                if (subElements == null)
                {
                    return null;
                }
                return (string)subElements[subElementName];
            }
            set
            {
                if (subElements == null)
                {
                    subElements = new Hashtable();
                }

                if (value == null)
                {
                    subElements.Remove(subElementName);
                }
                else
                {
                    subElements[subElementName] = value;
                }
            }
        }

        //////////////////////////////////////////////////////////////////////
        /// <summary>Checks whether the attribute has sub-elements.
        /// You can access sub-element names using the property
        /// SubElementSames.</summary>
        //////////////////////////////////////////////////////////////////////
        public bool HasSubElements
00573         {
            get
            {
                return subElements != null && subElements.Count > 0;
            }
        }

        //////////////////////////////////////////////////////////////////////
        /// <summary>The list of sub-elements name, which might be empty.
        ///
        /// The sub-elements names are returned in no particular order.
        ///
        /// You can get the value of these sub-elements using this[name].
        /// </summary>
        //////////////////////////////////////////////////////////////////////
        public string[] SubElementNames
00589         {
            get
            {
                if (subElements == null)
                {
                    return new string[0];
                }
                string[] retval = new string[subElements.Count];
                subElements.Keys.CopyTo(retval, 0);
                return retval;
            }
        }


        ///////////////////////////////////////////////////////////////////////
        /// <summary>Parses an XML node and create the corresponding
        /// GBaseAttribute.</summary>
        ///////////////////////////////////////////////////////////////////////
00607         public static GBaseAttribute ParseGBaseAttribute(XmlNode node)
        {
            if (node == null)
            {
                throw new ArgumentNullException("node");
            }

            GBaseAttribute attribute = new GBaseAttribute();
            attribute.Name = FromXmlTagName(node.LocalName);
            String value = Utilities.GetAttributeValue("type", node);
            if (value != null)
            {
                attribute.Type = GBaseAttributeType.ForName(value);
            }
            value =  Utilities.GetAttributeValue("access",node);
            attribute.IsPrivate = "private".Equals(value);

            foreach (XmlNode child in node.ChildNodes)
            {
                if (child.NodeType == XmlNodeType.Element)
                {
                    bool parsed = false;
                    if (child.NamespaceURI == GBaseNameTable.NSGBaseMeta)
                    {
                        object localName = child.LocalName;
                        if (localName.Equals("adjusted_name"))
                        {
                            attribute.AdjustedName = child.InnerText;
                            parsed = true;
                        }
                        else if (localName.Equals("adjusted_value"))
                        {
                            attribute.AdjustedValue = child.InnerText;
                            parsed = true;
                        }
                    }
                    // Keep everything else as XML
                    if (!parsed)
                    {
                        attribute[child.LocalName] = child.InnerXml;
                    }
                }
            }

            // If there are sub-elements, set the Content to null unless
            // there is clearly something in there.
            string content = ExtractDirectTextChildren(node);
            if (!"".Equals(content.Trim(kXmlWhitespaces)))
            {
                attribute.Content = content;
            }
            return attribute;
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Extracts all text nodes inside an element, ignoring
        /// text nodes inside children (contrary to XmlNode.InnerText).
        /// </summary>
        ///////////////////////////////////////////////////////////////////////
00666         private static string ExtractDirectTextChildren(XmlNode parent)
        {
            StringBuilder retval = new StringBuilder();
            for (XmlNode child = parent.FirstChild; child != null; child = child.NextSibling)
            {
                if (child.NodeType == XmlNodeType.Text || child.NodeType == XmlNodeType.CDATA) {
                    retval.Append(child.Value);
                }
            }
            return retval.ToString();
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Converts the current GBaseAttribute to XML.</summary>
        ///////////////////////////////////////////////////////////////////////
00681         public void Save(XmlWriter writer)
        {
            writer.WriteStartElement(XmlPrefix,
                                     ToXmlTagName(name),
                                     XmlNameSpace);
            if (type != null)
            {
                writer.WriteAttributeString("type", type.Name);
            }
            if (isPrivate)
            {
                writer.WriteAttributeString("access", "private");
            }

            if (adjustedValue != null)
            {
                writer.WriteStartElement(GBaseNameTable.GBaseMetaPrefix,
                                         "adjusted_value",
                                         GBaseNameTable.NSGBaseMeta);
                writer.WriteString(adjustedValue);
                writer.WriteEndElement();
            }

            if (adjustedName != null)
            {
                writer.WriteStartElement(GBaseNameTable.GBaseMetaPrefix,
                                         "adjusted_name",
                                         GBaseNameTable.NSGBaseMeta);
                writer.WriteString(adjustedName);
                writer.WriteEndElement();
            }

            if (content != null)
            {
                writer.WriteString(content);
            }
            if (subElements != null)
            {
                foreach (string elementName in subElements.Keys)
                {
                    string elementValue = (string)subElements[elementName];
                    if (elementValue != null)
                    {
                        writer.WriteStartElement(GBaseNameTable.GBasePrefix,
                                                 ToXmlTagName(elementName),
                                                 GBaseNameTable.NSGBase);
                        writer.WriteString(elementValue);
                        writer.WriteEndElement();
                    }
                }
            }
            writer.WriteEndElement();
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>A partial text representation, to help
        /// debugging.</summary>
        ///////////////////////////////////////////////////////////////////////
00739         public override string ToString()
        {
            StringBuilder retval = new StringBuilder();
            retval.Append(name);
            retval.Append('(');
            retval.Append(type);
            retval.Append("):");
            if (HasSubElements)
            {
                bool isFirst = true;
                foreach (string elementName in subElements.Keys)
                {
                    if (isFirst)
                    {
                        isFirst = false;
                    }
                    else
                    {
                        retval.Append(",");
                    }
                    retval.Append(elementName);
                    retval.Append(":\"");
                    retval.Append(subElements[elementName]);
                    retval.Append('"');
                }
            }
            else if (content != null)
            {
                retval.Append('"');
                retval.Append(content);
                retval.Append('"');
            }
            return retval.ToString();
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Compares two attribute names, types, content and
        /// private flag.</summary>
        ///////////////////////////////////////////////////////////////////////
00778         public override bool Equals(object o)
        {
            if (!(o is GBaseAttribute))
            {
                return false;
            }

            if (Object.ReferenceEquals(this, o))
            {
                return true;
            }

            GBaseAttribute other = o as GBaseAttribute;
            return name == other.name && type == other.type &&
                   content == other.content && isPrivate == other.isPrivate &&
                   adjustedName == other.adjustedName && adjustedValue == other.adjustedValue &&
                   HashTablesEquals(subElements, other.subElements);
        }

        /// <summary>Compares two hash tables.</summary>
00798         private bool HashTablesEquals(IDictionary a, IDictionary b)
        {
            if (a == null)
            {
                return b == null;
            }
            if (b == null)
            {
                return false;
            }
            ICollection aKeys = a.Keys;
            ICollection bKeys = b.Keys;
            if (aKeys.Count != bKeys.Count)
            {
                return false;
            }
            foreach (string key in aKeys)
            {
                object aValue = a[key];
                object bValue = b[key];
                if (aValue != bValue && (aValue == null || !aValue.Equals(bValue)))
                {
                    return false;
                }
            }
            return true;
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Generates a hash code for this element that is
        /// consistent with its Equals() method.</summary>
        ///////////////////////////////////////////////////////////////////////
00830         public override int GetHashCode()
        {
            int retval = 49 * (27 + name.GetHashCode()) + type.GetHashCode();
            if (content != null)
            {
                retval = 49 * retval + content.GetHashCode();
            }
            return retval;
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Given an attribute name, with spaces, generates
        /// the corresponding XML tag name.</summary>
        /// <param name="name">attribute name</param>
        /// <returns>the name with all spaces replaced with underscores
        /// </returns>
        ///////////////////////////////////////////////////////////////////////
00847         static string ToXmlTagName(string name)
        {
            return name.Replace(' ', '_');
        }

        ///////////////////////////////////////////////////////////////////////
        /// <summary>Given an XML tag name, with underscores, generates
        /// the corresponding attribute name.</summary>
        /// <param name="name">XML tag name, without namespace prefix</param>
        /// <returns>the name with all underscores replaced with spaces
        /// </returns>
        ///////////////////////////////////////////////////////////////////////
00859         static string FromXmlTagName(string name)
        {
            return name.Replace('_', ' ');
        }

        #region IExtensionElementFactory Members

        public string XmlName
00867         {
            get
            {
                return ToXmlTagName(Name);
            }
        }

        public string XmlNameSpace
00875         {
            get
            {
                return GBaseNameTable.NSGBase;
            }
        }

        public string XmlPrefix
00883         {
            get
            {
                return GBaseNameTable.GBasePrefix;
            }
        }

00890         public IExtensionElementFactory CreateInstance(XmlNode node, AtomFeedParser parser)
        {
            return ParseGBaseAttribute(node);
        }

        #endregion
    }

}

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