//
// DataSetInferXmlSchemaTest.cs
//
// Author:
//	Atsushi Enomoto <atsushi@ximian.com>
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.Collections;
using System.Data;
using System.IO;
using System.Xml;
using NUnit.Framework;

namespace MonoTests.System.Data
{
	[TestFixture]
	public class DataSetInferXmlSchemaTest : DataSetAssertion
	{
		string xml1 = "<root/>";
		string xml2 = "<root attr='value' />";
		string xml3 = "<root attr='value' attr2='2' />";
		string xml4 = "<root>simple.txt</root>";
		string xml5 = "<root><child/></root>";
		string xml6 = "<root><col1>sample</col1></root>";
		string xml7 = @"<root>
<col1>column 1 test</col1>
<col2>column2test</col2>
<col3>3get</col3>
</root>";
		string xml8 = @"<set>
<tab>
<col1>1</col1>
<col2>1</col2>
<col3>1</col3>
</tab>
</set>";
		string xml9 = @"<el1 attr1='val1' attrA='valA'>
  <el2 attr2='val2' attrB='valB'>
    <el3 attr3='val3' attrC='valC'>3</el3>
      <column2>1</column2>
      <column3>1</column3>
    <el4 attr4='val4' attrD='valD'>4</el4>
  </el2>
</el1>";
		// mixed content
		string xml10 = "<root>Here is a <b>mixed</b> content.</root>";
		// xml:space support
		string xml11 = @"<root xml:space='preserve'>
   <child_after_significant_space />
</root>";
		// This is useless ... since xml:space becomes a DataColumn here.
//		string xml12 = "<root xml:space='preserve'>     </root>";
		// The result is silly under MS.NET. It never ignores comment, so
		// They differ:
		//   1) <root>simple string.</root>
		//   2) <root>simple <!-- comment -->string.</root>
		// The same applies to PI.
//		string xml13 = "<root><tab><col>test <!-- out --> comment</col></tab></root>";

		// simple namespace/prefix support
		string xml14 = "<p:root xmlns:p='urn:foo'>test string</p:root>";
		// two tables that have the same content type.
		string xml15 = @"<root>
<table1>
        <col1_1>test1</col1_1>
        <col1_2>test2</col1_2>
</table1>
<table2>
        <col2_1>test1</col2_1>
        <col2_2>test2</col2_2>
</table2>
</root>";
		// foo cannot be both table chikd and root child
		string xml16 = @"<root>
<table>
        <foo>
                <tableFooChild1>1</tableFooChild1>
                <tableFooChild2>2</tableFooChild2>
        </foo>
        <bar />
</table>
<foo></foo>
<bar />
</root>";
		// simple namespace support
		string xml17 = @"<root xmlns='urn:foo' />";
		// conflict between simple and complex type element col
		string xml18 = @"<set>
<table>
<col>
        <another_col />
</col>
<col>simple text here.</col>
</table>
</set>";
		// variant of xml18: complex column appeared latter
		string xml19 =@"<set>
<table>
<col>simple text</col><!-- ignored -->
<col>
        <another_col />
</col>
</table>
</set>";
		// conflict check (actually it is not conflict) on two "col" tables
		string xml20 = @"<set>
<table>
<col>
        <another_col />
</col>
<col attr='value' />
</table>
</set>";
		// conflict between the attribute and the child element
		string xml21 = @"<set>
<table>
<col data='value'>
        <data />
</col>
</table>
</set>";
		// simple nest
		string xml22 = "<set><table><col><descendant/></col></table><table2><col2>v2</col2></table2></set>";
	  /*
		// simple diffgram
		string xml23 = @"<set>
  <xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>
    <xs:element name='table'>
      <xs:complexType>
      <xs:choice>
        <xs:any />
      </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <diffgr:diffgram
        xmlns:msdata='urn:schemas-microsoft-com:xml-msdata'
        xmlns:diffgr='urn:schemas-microsoft-com:xml-diffgram-v1'>
    <table>
      <col>1</col>
    </table>
  </diffgr:diffgram>
</set>";
		// just deep table
		string xml24 = "<p1><p2><p3><p4><p5><p6/></p5></p4></p3></p2></p1>";
	  */

		private DataSet GetDataSet (string xml, string [] nss)
		{
			DataSet ds = new DataSet ();
			ds.InferXmlSchema (new XmlTextReader (xml, XmlNodeType.Document, null), nss);
			return ds;
		}

		[Test]
		public void NullFileName ()
		{
			DataSet ds = new DataSet ();
			ds.InferXmlSchema ((XmlReader) null, null);
			AssertDataSet ("null", ds, "NewDataSet", 0, 0);
		}

		[Test]
		public void SingleElement ()
		{
			DataSet ds = GetDataSet (xml1, null);
			AssertDataSet ("xml1", ds, "root", 0, 0);

			ds = GetDataSet (xml4, null);
			AssertDataSet ("xml4", ds, "root", 0, 0);

			// namespaces
			ds = GetDataSet (xml14, null);
			AssertDataSet ("xml14", ds, "root", 0, 0);
			Assert.AreEqual ("p", ds.Prefix);
			Assert.AreEqual ("urn:foo", ds.Namespace);

			ds = GetDataSet (xml17, null);
			AssertDataSet ("xml17", ds, "root", 0, 0);
			Assert.AreEqual ("urn:foo", ds.Namespace);
		}

		[Test]
		public void SingleElementWithAttribute ()
		{
			DataSet ds = GetDataSet (xml2, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 1, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "attr", true, false, 0, 1, "attr", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
		}

		[Test]
		public void SingleElementWithTwoAttribute ()
		{
			DataSet ds = GetDataSet (xml3, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 2, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "attr", true, false, 0, 1, "attr", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("col", dt.Columns [1], "attr2", true, false, 0, 1, "attr2", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
		}

		[Test]
		public void SingleChild ()
		{
			DataSet ds = GetDataSet (xml5, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 1, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "child", true, false, 0, 1, "child", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);

			ds = GetDataSet (xml6, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 1, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "col1", true, false, 0, 1, "col1", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
		}

		[Test]
		public void SimpleElementTable ()
		{
			DataSet ds = GetDataSet (xml7, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 3, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "col1", true, false, 0, 1, "col1", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("col2", dt.Columns [1], "col2", true, false, 0, 1, "col2", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("col3", dt.Columns [2], "col3", true, false, 0, 1, "col3", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);
		}

		[Test]
		public void SimpleDataSet ()
		{
			DataSet ds = GetDataSet (xml8, null);
			AssertDataSet ("ds", ds, "set", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "tab", 3, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "col1", true, false, 0, 1, "col1", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("col2", dt.Columns [1], "col2", true, false, 0, 1, "col2", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("col3", dt.Columns [2], "col3", true, false, 0, 1, "col3", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);
		}

		[Test]
		public void ComplexElementAttributeTable1 ()
		{
			// FIXME: Also test ReadXml (, XmlReadMode.InferSchema) and
			// make sure that ReadXml() stores DataRow to el1 (and maybe to others)
			DataSet ds = GetDataSet (xml9, null);
			AssertDataSet ("ds", ds, "NewDataSet", 4, 3);
			DataTable dt = ds.Tables [0];

			AssertDataTable ("dt1", dt, "el1", 3, 0, 0, 1, 1, 1);
			AssertDataColumn ("el1_Id", dt.Columns [0], "el1_Id", false, true, 0, 1, "el1_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);
			AssertDataColumn ("el1_attr1", dt.Columns [1], "attr1", true, false, 0, 1, "attr1", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("el1_attrA", dt.Columns [2], "attrA", true, false, 0, 1, "attrA", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);

			dt = ds.Tables [1];
			AssertDataTable ("dt2", dt, "el2", 6, 0, 1, 2, 2, 1);
			AssertDataColumn ("el2_Id", dt.Columns [0], "el2_Id", false, true, 0, 1, "el2_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);
			AssertDataColumn ("el2_col2", dt.Columns [1], "column2", true, false, 0, 1, "column2", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("el2_col3", dt.Columns [2], "column3", true, false, 0, 1, "column3", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);
			AssertDataColumn ("el2_attr2", dt.Columns [3], "attr2", true, false, 0, 1, "attr2", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 3, String.Empty, false, false);
			AssertDataColumn ("el2_attrB", dt.Columns [4], "attrB", true, false, 0, 1, "attrB", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 4, String.Empty, false, false);
			AssertDataColumn ("el2_el1Id", dt.Columns [5], "el1_Id", true, false, 0, 1, "el1_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 5, String.Empty, false, false);

			dt = ds.Tables [2];
			AssertDataTable ("dt3", dt, "el3", 4, 0, 1, 0, 1, 0);
			AssertDataColumn ("el3_attr3", dt.Columns [0], "attr3", true, false, 0, 1, "attr3", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("el3_attrC", dt.Columns [1], "attrC", true, false, 0, 1, "attrC", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("el3_Text", dt.Columns [2], "el3_Text", true, false, 0, 1, "el3_Text", MappingType.SimpleContent, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);
			AssertDataColumn ("el3_el2Id", dt.Columns [3], "el2_Id", true, false, 0, 1, "el2_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 3, String.Empty, false, false);

			dt = ds.Tables [3];
			AssertDataTable ("dt4", dt, "el4", 4, 0, 1, 0, 1, 0);
			AssertDataColumn ("el3_attr4", dt.Columns [0], "attr4", true, false, 0, 1, "attr4", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("el4_attrD", dt.Columns [1], "attrD", true, false, 0, 1, "attrD", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("el4_Text", dt.Columns [2], "el4_Text", true, false, 0, 1, "el4_Text", MappingType.SimpleContent, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);
			AssertDataColumn ("el4_el2Id", dt.Columns [3], "el2_Id", true, false, 0, 1, "el2_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 3, String.Empty, false, false);
		}

		[Test]
		public void MixedContent ()
		{
			// Note that text part is ignored.

			DataSet ds = GetDataSet (xml10, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 1, 0, 0, 0, 0, 0);
			AssertDataColumn ("col", dt.Columns [0], "b", true, false, 0, 1, "b", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
		}

		[Test]
		public void SignificantWhitespaceIgnored ()
		{
			// Note that 1) significant whitespace is ignored, and 
			// 2) xml:space is treated as column (and also note namespaces).
			DataSet ds = GetDataSet (xml11, null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 1, 0, 0, 0, 0, 0);
			AssertDataColumn ("element", dt.Columns [0], "child_after_significant_space", true, false, 0, 1, "child_after_significant_space", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			Assert.AreEqual (1, dt.Columns.Count, "xml:space is not treated as column");
		}

		[Test]
		public void SignificantWhitespaceIgnored2 ()
		{
			// To make sure, create pure significant whitespace element
			// using XmlNodeReader (that does not have xml:space attribute
			// column).
			DataSet ds = new DataSet ();
			XmlDocument doc = new XmlDocument ();
			doc.AppendChild (doc.CreateElement ("root"));
			doc.DocumentElement.AppendChild (doc.CreateSignificantWhitespace
			("      \n\n"));
			XmlReader xr = new XmlNodeReader (doc);
			ds.InferXmlSchema (xr, null);
			AssertDataSet ("pure_whitespace", ds, "root", 0, 0);
		}

		[Test]
		public void TwoElementTable ()
		{
			// FIXME: Also test ReadXml (, XmlReadMode.InferSchema) and
			// make sure that ReadXml() stores DataRow to el1 (and maybe to others)
			DataSet ds = GetDataSet (xml15, null);
			AssertDataSet ("ds", ds, "root", 2, 0);

			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "table1", 2, 0, 0, 0, 0, 0);
			AssertDataColumn ("col1_1", dt.Columns [0], "col1_1", true, false, 0, 1, "col1_1", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("col1_2", dt.Columns [1], "col1_2", true, false, 0, 1, "col1_2", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);

			dt = ds.Tables [1];
			AssertDataTable ("dt", dt, "table2", 2, 0, 0, 0, 0, 0);
			AssertDataColumn ("col2_1", dt.Columns [0], "col2_1", true, false, 0, 1, "col2_1", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("col2_2", dt.Columns [1], "col2_2", true, false, 0, 1, "col2_2", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
		}

		[Test]
		[Category ("NotWorking")]
		[ExpectedException (typeof (ArgumentException))]
		// The same table cannot be the child table in two nested relations.
		public void ComplexElementTable1 ()
		{
			// TODO: Also test ReadXml (, XmlReadMode.InferSchema) and
			// make sure that ReadXml() stores DataRow to el1 (and maybe to others)
			DataSet ds = GetDataSet (xml16, null);
/*
			AssertDataSet ("ds", ds, "NewDataSet", 4, 0);

			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "root", 2, 0);
			AssertDataColumn ("table#1_id", dt.Columns [0], "root_Id", false, true, 0, 1, "root_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);
			AssertDataColumn ("table#1_bar", dt.Columns [1], "bar", true, false, 0, 1, "bar", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);

			dt = ds.Tables [1];
			AssertDataTable ("dt2", dt, "table", 3, 0);
			AssertDataColumn ("table#2_id", dt.Columns [0], "table_Id", false, true, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);
			AssertDataColumn ("table#2_bar", dt.Columns [1], "bar", true, false, 0, 1, "bar", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("table#2_refid", dt.Columns [0], "root_Id", true, false, 0, 1, "root_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);

			dt = ds.Tables [2];
			AssertDataTable ("dt3", dt, "foo", 3, 0);
			AssertDataColumn ("table#3_col1", dt.Columns [0], "tableFooChild1", true, false, 0, 1, "tableFooChild1", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("table#3_col2", dt.Columns [0], "tableFooChild2", true, false, 0, 1, "tableFooChild2", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);
			AssertDataColumn ("table#3_refid", dt.Columns [0], "table_Id", true, false, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 2, String.Empty, false, false);
*/
		}

		[Test]
		public void ConflictSimpleComplexColumns ()
		{
			DataSet ds = GetDataSet (xml18, null);
			AssertDataSet ("ds", ds, "set", 2, 1);

			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "table", 1, 0, 0, 1, 1, 1);
			AssertDataColumn ("table_Id", dt.Columns [0], "table_Id", false, true, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);

			dt = ds.Tables [1];
			AssertDataTable ("dt", dt, "col", 2, 0, 1, 0, 1, 0);
			AssertDataColumn ("another_col", dt.Columns [0], "another_col", true, false, 0, 1, "another_col", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("table_refId", dt.Columns [1], "table_Id", true, false, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 1, String.Empty, false, false);

			DataRelation dr = ds.Relations [0];
			AssertDataRelation ("rel", dr, "table_col", true, new string [] {"table_Id"}, new string [] {"table_Id"}, true, true);
			AssertUniqueConstraint ("uniq", dr.ParentKeyConstraint, "Constraint1", true, new string [] {"table_Id"});
			AssertForeignKeyConstraint ("fkey", dr.ChildKeyConstraint, "table_col", AcceptRejectRule.None, Rule.Cascade, Rule.Cascade, new string [] {"table_Id"}, new string [] {"table_Id"});
		}

		[Test]
		public void ConflictColumnTable ()
		{
			DataSet ds = GetDataSet (xml19, null);
			AssertDataSet ("ds", ds, "set", 2, 1);

			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "table", 1, 0, 0, 1, 1, 1);
			AssertDataColumn ("table_Id", dt.Columns [0], "table_Id", false, true, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);

			dt = ds.Tables [1];
			AssertDataTable ("dt", dt, "col", 2, 0, 1, 0, 1, 0);
			AssertDataColumn ("table_refId", dt.Columns ["table_Id"], "table_Id", true, false, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, /*0*/-1, String.Empty, false, false);
			AssertDataColumn ("another_col", dt.Columns ["another_col"], "another_col", true, false, 0, 1, "another_col", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, /*1*/-1, String.Empty, false, false);

			DataRelation dr = ds.Relations [0];
			AssertDataRelation ("rel", dr, "table_col", true, new string [] {"table_Id"}, new string [] {"table_Id"}, true, true);
			AssertUniqueConstraint ("uniq", dr.ParentKeyConstraint, "Constraint1", true, new string [] {"table_Id"});
			AssertForeignKeyConstraint ("fkey", dr.ChildKeyConstraint, "table_col", AcceptRejectRule.None, Rule.Cascade, Rule.Cascade, new string [] {"table_Id"}, new string [] {"table_Id"});
		}

		[Test]
		public void ConflictColumnTableAttribute ()
		{
			// Conflicts between a column and a table, additionally an attribute.
			DataSet ds = GetDataSet (xml20, null);
			AssertDataSet ("ds", ds, "set", 2, 1);

			DataTable dt = ds.Tables [0];
			AssertDataTable ("dt", dt, "table", 1, 0, 0, 1, 1, 1);
			AssertDataColumn ("table_Id", dt.Columns [0], "table_Id", false, true, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, true);

			dt = ds.Tables [1];
			AssertDataTable ("dt", dt, "col", 3, 0, 1, 0, 1, 0);
			AssertDataColumn ("another_col", dt.Columns [0], "another_col", true, false, 0, 1, "another_col", MappingType.Element, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, 0, String.Empty, false, false);
			AssertDataColumn ("table_refId", dt.Columns ["table_Id"], "table_Id", true, false, 0, 1, "table_Id", MappingType.Hidden, typeof (int), DBNull.Value, String.Empty, -1, String.Empty, /*1*/-1, String.Empty, false, false);
			AssertDataColumn ("attr", dt.Columns ["attr"], "attr", true, false, 0, 1, "attr", MappingType.Attribute, typeof (string), DBNull.Value, String.Empty, -1, String.Empty, /*2*/-1, String.Empty, false, false);

			DataRelation dr = ds.Relations [0];
			AssertDataRelation ("rel", dr, "table_col", true, new string [] {"table_Id"}, new string [] {"table_Id"}, true, true);
			AssertUniqueConstraint ("uniq", dr.ParentKeyConstraint, "Constraint1", true, new string [] {"table_Id"});
			AssertForeignKeyConstraint ("fkey", dr.ChildKeyConstraint, "table_col", AcceptRejectRule.None, Rule.Cascade, Rule.Cascade, new string [] {"table_Id"}, new string [] {"table_Id"});
		}

		[Test]
		[ExpectedException (typeof (DataException))]
		public void ConflictAttributeDataTable ()
		{
			// attribute "data" becomes DataTable, and when column "data"
			// appears, it cannot be DataColumn, since the name is 
			// already allocated for DataTable.
			DataSet ds = GetDataSet (xml21, null);
		}

		[Test]
		[ExpectedException (typeof (ConstraintException))]
		public void ConflictExistingPrimaryKey ()
		{
			// <wrong>The 'col' DataTable tries to create another primary key (and fails)</wrong> The data violates key constraint.
			DataSet ds = new DataSet ();
			ds.Tables.Add (new DataTable ("table"));
			DataColumn c = new DataColumn ("pk");
			ds.Tables [0].Columns.Add (c);
			ds.Tables [0].PrimaryKey = new DataColumn [] {c};
			XmlTextReader xtr = new XmlTextReader (xml22, XmlNodeType.Document, null);
			xtr.Read ();
			ds.ReadXml (xtr, XmlReadMode.InferSchema);
		}

		[Test]
		public void IgnoredNamespaces ()
		{
			string xml = "<root attr='val' xmlns:a='urn:foo' a:foo='hogehoge' />";
			DataSet ds = new DataSet ();
			ds.InferXmlSchema (new StringReader (xml), null);
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			AssertDataTable ("dt", ds.Tables [0], "root", 2, 0, 0, 0, 0, 0);

			ds = new DataSet ();
			ds.InferXmlSchema (new StringReader (xml), new string [] {"urn:foo"});
			AssertDataSet ("ds", ds, "NewDataSet", 1, 0);
			// a:foo is ignored
			AssertDataTable ("dt", ds.Tables [0], "root", 1, 0, 0, 0, 0, 0);
		}

		[Test]
		public void ContainsSchema ()
		{
			DataSet ds = new DataSet();
			DataTable dt1 = new DataTable();
			ds.Tables.Add(dt1);
			DataColumn dc1 = new DataColumn("Col1");
			dt1.Columns.Add(dc1);
			dt1.Rows.Add(new string[] { "aaa" } );
			DataTable dt2 = new DataTable();
			ds.Tables.Add(dt2);
			DataColumn dc2 = new DataColumn("Col2");
			dt2.Columns.Add(dc2);
			dt2.Rows.Add(new string[] { "bbb" } );

			DataRelation rel = new DataRelation("Rel1",dc1,dc2,false);
			ds.Relations.Add(rel);

			StringWriter sw = new StringWriter ();
			ds.WriteXml(sw, XmlWriteMode.WriteSchema);

			ds = new DataSet();
			ds.ReadXml(new StringReader (sw.ToString ()));
			sw = new StringWriter ();
			ds.WriteXml(sw);
			XmlDocument doc = new XmlDocument ();
			doc.LoadXml (sw.ToString ());
			Assert.AreEqual (2, doc.DocumentElement.ChildNodes.Count);
		}
	}
}