Unit test for MPD builder

Initial checkin, very small coverage.

Change-Id: I60f3fd768d5b8dca7a84f051e57f59a654272e53

mpd/base/mpd_builder.cc

@@ -165,7 +165,7 @@ uint32 MpdBuilder::GetStaticMpdDuration(XmlNode* mpd_node) {
 
   xmlNodePtr period_node = xmlFirstElementChild(mpd_node->GetRawPtr());
   DCHECK(period_node);
-  DCHECK_NE(strcmp(reinterpret_cast<const char*>(period_node->name), "Period"),
+  DCHECK_EQ(strcmp(reinterpret_cast<const char*>(period_node->name), "Period"),
             0);
 
   // TODO(rkuroiwa): Update this so that the duration for each Representation is

mpd/base/mpd_builder_unittest.cc

@@ -0,0 +1,147 @@
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/strings/string_util.h"
+#include "mpd/base/mpd_builder.h"
+#include "mpd/base/xml/scoped_xml_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/libxml/src/include/libxml/parser.h"
+
+namespace dash_packager {
+namespace {
+
+// This was validated at a validator site below as well.
+// http://www-itec.uni-klu.ac.at/dash/?page_id=605#
+const char kValidMpd[] = "<?xml version='1.0' encoding='UTF-8'?>\n\
+<MPD\n\
+ xmlns='urn:mpeg:DASH:schema:MPD:2011'\n\
+ xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'\n\
+ xmlns:xlink='http://www.w3.org/1999/xlink'\n\
+ xsi:schemaLocation='urn:mpeg:DASH:schema:MPD:2011 DASH-MPD.xsd'\n\
+ minBufferTime='PT2S'\n\
+ type='static'\n\
+ profiles='urn:mpeg:dash:profile:isoff-on-demand:2011'\n\
+ mediaPresentationDuration='PT101S'>\n\
+  <BaseURL>http://cdn1.example.com/</BaseURL>\n\
+  <Period>\n\
+    <AdaptationSet id='0'>\n\
+      <Representation id='0' bandwidth='20000' mimeType='video/mp4' codecs='avc1'>\n\
+        <BaseURL>\n\
+         something.mp4\n\
+        </BaseURL>\n\
+      </Representation>\n\
+      <Representation id='1' bandwidth='20000' mimeType='video/mp4' codecs='avc1'>\n\
+        <BaseURL>\n\
+         somethingelse.mp4\n\
+        </BaseURL>\n\
+      </Representation>\n\
+    </AdaptationSet>\n\
+  </Period>\n\
+</MPD>\n\
+";
+const size_t kValidMpdSize = arraysize(kValidMpd) - 1;  // Exclude '\0'.
+
+base::FilePath GetSchemaPath() {
+  base::FilePath file_path;
+  CHECK(PathService::Get(base::DIR_SOURCE_ROOT, &file_path));
+
+  file_path = file_path.Append(FILE_PATH_LITERAL("mpd"))
+      .Append(FILE_PATH_LITERAL("test"))
+      .Append(FILE_PATH_LITERAL("schema"))
+      .Append(FILE_PATH_LITERAL("DASH-MPD.xsd"));
+  return file_path;
+}
+
+std::string GetPathContent(const base::FilePath& file_path) {
+  std::string content;
+  bool file_read_to_string = file_util::ReadFileToString(file_path, &content);
+  DCHECK(file_read_to_string);
+  return content;
+}
+
+bool ValidateMpdSchema(const std::string& mpd) {
+  xml::ScopedXmlPtr<xmlDoc>::type doc(xmlParseMemory(mpd.data(), mpd.size()));
+  if (!doc) {
+    LOG(ERROR) << "Failed to parse mpd into an xml doc.";
+    return false;
+  }
+
+  base::FilePath schema_path = GetSchemaPath();
+  std::string schema_str = GetPathContent(schema_path);
+
+  // First, I need to load the schema as a xmlDoc so that I can pass the path of
+  // the DASH-MPD.xsd. Then it can resolve the relative path included from the
+  // XSD when creating xmlSchemaParserCtxt.
+  xml::ScopedXmlPtr<xmlDoc>::type schema_as_doc(
+      xmlReadMemory(schema_str.data(),
+                    schema_str.size(),
+                    schema_path.value().c_str(),
+                    NULL,
+                    0));
+  DCHECK(schema_as_doc);
+  xml::ScopedXmlPtr<xmlSchemaParserCtxt>::type schema_parser_ctxt(
+      xmlSchemaNewDocParserCtxt(schema_as_doc.get()));
+  DCHECK(schema_parser_ctxt);
+
+  xml::ScopedXmlPtr<xmlSchema>::type schema(
+      xmlSchemaParse(schema_parser_ctxt.get()));
+  DCHECK(schema);
+
+  xml::ScopedXmlPtr<xmlSchemaValidCtxt>::type valid_ctxt(
+      xmlSchemaNewValidCtxt(schema.get()));
+  DCHECK(valid_ctxt);
+  int validation_result =
+      xmlSchemaValidateDoc(valid_ctxt.get(), doc.get());
+  DLOG(INFO) << "XSD validation result: " << validation_result;
+  return validation_result == 0;
+}
+
+}  // namespace
+
+// Check if the schema validation works. If not, then most of the tests would
+// probably fail.
+TEST(MpdSchemaMetaTest, CheckSchemaValidatorWorks) {
+  ASSERT_TRUE(ValidateMpdSchema(std::string(kValidMpd, kValidMpdSize)));
+}
+
+// TODO(rkuroiwa): MPD builder does not build a valid MPD yet. Enable these when
+// its done. Make sure to compare against a known MPD to validate.
+// A normal use case where there are 2 adaptation sets and 2 representations.
+TEST(MpdBuilder, DISABLED_VOD_Normal) {
+  MpdBuilder mpd(MpdBuilder::kStatic);
+  AdaptationSet* adaptation_set = mpd.AddAdaptationSet();
+  ASSERT_TRUE(adaptation_set);
+
+  AdaptationSet* adaptation_set2 = mpd.AddAdaptationSet();
+  ASSERT_TRUE(adaptation_set2);
+
+  MediaInfo media_info;
+  media_info.set_bandwidth(100);
+  ASSERT_TRUE(adaptation_set->AddRepresentation(media_info));
+  ASSERT_TRUE(adaptation_set2->AddRepresentation(media_info));
+
+  std::string mpd_doc;
+  ASSERT_TRUE(mpd.ToString(&mpd_doc));
+  ASSERT_TRUE(ValidateMpdSchema(mpd_doc));
+}
+
+// Different media duration should not error.
+TEST(MpdBuilder, DISABLED_VOD_DifferentMediaDuration) {
+  MpdBuilder mpd(MpdBuilder::kStatic);
+  AdaptationSet* adaptation_set = mpd.AddAdaptationSet();
+  ASSERT_TRUE(adaptation_set);
+
+  MediaInfo media_info;
+  media_info.set_bandwidth(20000);
+  media_info.set_media_duration_seconds(100);
+  ASSERT_TRUE(adaptation_set->AddRepresentation(media_info));
+
+  media_info.set_media_duration_seconds(101);
+  ASSERT_TRUE(adaptation_set->AddRepresentation(media_info));
+
+  std::string mpd_doc;
+  ASSERT_TRUE(mpd.ToString(&mpd_doc));
+  ASSERT_TRUE(ValidateMpdSchema(mpd_doc));
+}
+
+}  // namespace dash_packager

mpd/base/xml/scoped_xml_ptr.h

@@ -5,12 +5,20 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "third_party/libxml/src/include/libxml/tree.h"
+#include "third_party/libxml/src/include/libxml/xmlschemas.h"
 
 namespace dash_packager {
 namespace xml {
 
 struct XmlDeleter {
   // Called by scoped_ptr. http://goo.gl/YaLbcS
+  inline void operator()(xmlSchemaParserCtxtPtr ptr) const {
+    xmlSchemaFreeParserCtxt(ptr);
+  }
+  inline void operator()(xmlSchemaValidCtxtPtr ptr) const {
+    xmlSchemaFreeValidCtxt(ptr);
+  }
+  inline void operator()(xmlSchemaPtr ptr) const { xmlSchemaFree(ptr); }
   inline void operator()(xmlNodePtr ptr) const { xmlFreeNode(ptr); }
   inline void operator()(xmlDocPtr ptr) const { xmlFreeDoc(ptr); }
   inline void operator()(xmlChar* ptr) const { xmlFree(ptr); }

mpd/mpd.gyp

@@ -1,6 +1,11 @@
 # GYP file for any MPD generation targets.
 
 {
+  'target_defaults': {
+    'include_dirs': [
+      '..',
+    ],
+  },
   'targets': [
     {
       'target_name': 'media_info_proto',
@@ -28,14 +33,28 @@
         'base/xml/xml_node.cc',
         'base/xml/xml_node.h',
       ],
-      'include_dirs': [
-        '..',
-      ],
       'dependencies': [
         '../base/base.gyp:base',
         '../third_party/libxml/libxml.gyp:libxml',
         'media_info_proto',
       ],
+      'export_dependent_settings': [
+        '../third_party/libxml/libxml.gyp:libxml',
+        'media_info_proto',
+      ],
+    },
+    {
+      'target_name': 'mpd_unittest',
+      'type': 'executable',
+      'sources': [
+        'base/mpd_builder_unittest.cc',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../base/base.gyp:run_all_unittests',
+        '../testing/gtest.gyp:gtest',
+        'mpd_builder',
+      ],
     },
   ],
 }

mpd/test/schema/DASH-MPD.xsd

@@ -0,0 +1,390 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema targetNamespace="urn:mpeg:DASH:schema:MPD:2011"
+  attributeFormDefault="unqualified"
+  elementFormDefault="qualified"
+  xmlns:xs="http://www.w3.org/2001/XMLSchema"
+  xmlns:xlink="http://www.w3.org/1999/xlink"
+  xmlns="urn:mpeg:DASH:schema:MPD:2011">
+
+  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="xlink.xsd"/>
+
+  <xs:annotation>
+    <xs:appinfo>Media Presentation Description</xs:appinfo>
+    <xs:documentation xml:lang="en">
+      This Schema defines the Media Presentation Description for MPEG-DASH.
+    </xs:documentation>
+  </xs:annotation>
+
+  <!-- MPD: main element -->
+  <xs:element name="MPD" type="MPDtype"/>
+
+  <!-- MPD Type -->
+  <xs:complexType name="MPDtype">
+    <xs:sequence>
+      <xs:element name="ProgramInformation" type="ProgramInformationType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="BaseURL" type="BaseURLType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="Location" type="xs:anyURI" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="Period" type="PeriodType" maxOccurs="unbounded"/>
+      <xs:element name="Metrics" type="MetricsType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="id" type="xs:string"/>
+    <xs:attribute name="profiles" type="xs:string" use="required"/>
+    <xs:attribute name="type" type="PresentationType" default="static"/>
+    <xs:attribute name="availabilityStartTime" type="xs:dateTime"/>
+    <xs:attribute name="availabilityEndTime" type="xs:dateTime"/>
+    <xs:attribute name="mediaPresentationDuration" type="xs:duration"/>
+    <xs:attribute name="minimumUpdatePeriod" type="xs:duration"/>
+    <xs:attribute name="minBufferTime" type="xs:duration" use="required"/>
+    <xs:attribute name="timeShiftBufferDepth" type="xs:duration"/>
+    <xs:attribute name="suggestedPresentationDelay" type="xs:duration"/>
+    <xs:attribute name="maxSegmentDuration" type="xs:duration"/>
+    <xs:attribute name="maxSubsegmentDuration" type="xs:duration"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Presentation Type enumeration -->
+  <xs:simpleType name="PresentationType">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="static"/>
+      <xs:enumeration value="dynamic"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- Period -->
+  <xs:complexType name="PeriodType">
+    <xs:sequence>
+      <xs:element name="BaseURL" type="BaseURLType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="SegmentBase" type="SegmentBaseType" minOccurs="0"/>
+      <xs:element name="SegmentList" type="SegmentListType" minOccurs="0"/>
+      <xs:element name="SegmentTemplate" type="SegmentTemplateType" minOccurs="0"/>
+      <xs:element name="AdaptationSet" type="AdaptationSetType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="Subset" type="SubsetType" minOccurs="0" maxOccurs="unbounded"/>
+			<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute ref="xlink:href"/>
+    <xs:attribute ref="xlink:actuate" default="onRequest"/>
+    <xs:attribute name="id" type="xs:string" />
+    <xs:attribute name="start" type="xs:duration"/>
+    <xs:attribute name="duration" type="xs:duration"/>
+    <xs:attribute name="bitstreamSwitching" type="xs:boolean" default="false"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Adaptation Set -->
+  <xs:complexType name="AdaptationSetType">
+    <xs:complexContent>
+      <xs:extension base="RepresentationBaseType">
+        <xs:sequence>
+          <xs:element name="Accessibility" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="Role" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="Rating" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="Viewpoint" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="ContentComponent" type="ContentComponentType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="BaseURL" type="BaseURLType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="SegmentBase" type="SegmentBaseType" minOccurs="0"/>
+          <xs:element name="SegmentList" type="SegmentListType" minOccurs="0"/>
+          <xs:element name="SegmentTemplate" type="SegmentTemplateType" minOccurs="0"/>
+          <xs:element name="Representation" type="RepresentationType" minOccurs="0" maxOccurs="unbounded"/>
+        </xs:sequence>
+        <xs:attribute ref="xlink:href"/>
+        <xs:attribute ref="xlink:actuate" default="onRequest"/>
+        <xs:attribute name="id" type="xs:unsignedInt"/>
+        <xs:attribute name="group" type="xs:unsignedInt"/>
+        <xs:attribute name="lang" type="xs:language"/>
+        <xs:attribute name="contentType" type="xs:string"/>
+        <xs:attribute name="par" type="RatioType"/>
+        <xs:attribute name="minBandwidth" type="xs:unsignedInt"/>
+        <xs:attribute name="maxBandwidth" type="xs:unsignedInt"/>
+        <xs:attribute name="minWidth" type="xs:unsignedInt"/>
+        <xs:attribute name="maxWidth" type="xs:unsignedInt"/>
+        <xs:attribute name="minHeight" type="xs:unsignedInt"/>
+        <xs:attribute name="maxHeight" type="xs:unsignedInt"/>
+        <xs:attribute name="minFrameRate" type="FrameRateType"/>
+        <xs:attribute name="maxFrameRate" type="FrameRateType"/>
+        <xs:attribute name="segmentAlignment" type="ConditionalUintType" default="false"/>
+        <xs:attribute name="subsegmentAlignment" type="ConditionalUintType" default="false"/>
+        <xs:attribute name="subsegmentStartsWithSAP" type="SAPType" default="0"/>
+        <xs:attribute name="bitstreamSwitching" type="xs:boolean"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <!-- Type for Frame Rate -->
+  <xs:simpleType name="FrameRateType">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[0-9]*[0-9](/[0-9]*[0-9])?"/>
+    </xs:restriction>
+  </xs:simpleType>
+ 
+
+  <!-- Conditional Unsigned Integer (unsignedInt or boolean) -->
+  <xs:simpleType name="ConditionalUintType">
+    <xs:union memberTypes="xs:unsignedInt xs:boolean"/>
+  </xs:simpleType>
+
+  <!-- Content Component -->
+  <xs:complexType name="ContentComponentType">
+    <xs:sequence>
+      <xs:element name="Accessibility" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="Role" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="Rating" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="Viewpoint" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="id" type="xs:unsignedInt"/>
+    <xs:attribute name="lang" type="xs:language"/>
+    <xs:attribute name="contentType" type="xs:string"/>
+    <xs:attribute name="par" type="RatioType"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Representation -->
+  <xs:complexType name="RepresentationType">
+    <xs:complexContent>
+      <xs:extension base="RepresentationBaseType">
+        <xs:sequence>
+          <xs:element name="BaseURL" type="BaseURLType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="SubRepresentation" type="SubRepresentationType" minOccurs="0" maxOccurs="unbounded"/>
+          <xs:element name="SegmentBase" type="SegmentBaseType" minOccurs="0"/>
+          <xs:element name="SegmentList" type="SegmentListType" minOccurs="0"/>
+          <xs:element name="SegmentTemplate" type="SegmentTemplateType" minOccurs="0"/>
+        </xs:sequence>
+        <xs:attribute name="id" type="StringNoWhitespaceType" use="required"/>
+        <xs:attribute name="bandwidth" type="xs:unsignedInt" use="required"/>
+        <xs:attribute name="qualityRanking" type="xs:unsignedInt"/>
+        <xs:attribute name="dependencyId" type="StringVectorType"/>
+        <xs:attribute name="mediaStreamStructureId" type="StringVectorType"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <!-- String without white spaces -->
+  <xs:simpleType name="StringNoWhitespaceType">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[^\r\n\t \p{Z}]*"/>
+    </xs:restriction>
+  </xs:simpleType>
+  
+
+  <!-- SubRepresentation -->
+  <xs:complexType name="SubRepresentationType">
+    <xs:complexContent>
+      <xs:extension base="RepresentationBaseType">
+        <xs:attribute name="level" type="xs:unsignedInt"/>
+        <xs:attribute name="dependencyLevel" type="UIntVectorType"/>
+        <xs:attribute name="bandwidth" type="xs:unsignedInt"/>
+        <xs:attribute name="contentComponent" type="StringVectorType"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- Representation base (common attributes and elements) -->
+  <xs:complexType name="RepresentationBaseType">
+    <xs:sequence>
+      <xs:element name="FramePacking" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="AudioChannelConfiguration" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:element name="ContentProtection" type="DescriptorType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="profiles" type="xs:string"/>
+    <xs:attribute name="width" type="xs:unsignedInt"/>
+    <xs:attribute name="height" type="xs:unsignedInt"/>
+    <xs:attribute name="sar" type="RatioType"/>
+    <xs:attribute name="frameRate" type="FrameRateType"/>
+    <xs:attribute name="audioSamplingRate" type="xs:string"/>
+    <xs:attribute name="mimeType" type="xs:string"/>
+    <xs:attribute name="segmentProfiles" type="xs:string"/>
+    <xs:attribute name="codecs" type="xs:string"/>
+    <xs:attribute name="maximumSAPPeriod" type="xs:double"/>
+    <xs:attribute name="startWithSAP" type="SAPType"/>
+    <xs:attribute name="maxPlayoutRate" type="xs:double"/>
+    <xs:attribute name="codingDependency" type="xs:boolean"/>
+    <xs:attribute name="scanType" type="VideoScanType"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+  
+  <!-- Ratio Type for sar and par -->
+  <xs:simpleType name="RatioType">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[0-9]*:[0-9]*"/>
+    </xs:restriction>
+  </xs:simpleType> 
+
+  <!-- Stream Access Point type enumeration -->
+  <xs:simpleType name="SAPType">
+    <xs:restriction base="xs:unsignedInt">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="6"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- Video Scan type enumeration -->
+  <xs:simpleType name="VideoScanType">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="progressive"/>
+      <xs:enumeration value="interlaced"/>
+      <xs:enumeration value="unknown"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- Subset  -->
+  <xs:complexType name="SubsetType">
+    <xs:attribute name="contains" type="UIntVectorType" use="required"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Segment information base -->
+  <xs:complexType name="SegmentBaseType">
+    <xs:sequence>
+      <xs:element name="Initialization" type="URLType" minOccurs="0"/>
+      <xs:element name="RepresentationIndex" type="URLType" minOccurs="0"/>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="timescale" type="xs:unsignedInt"/>
+    <xs:attribute name="presentationTimeOffset" type="xs:unsignedInt"/>
+    <xs:attribute name="indexRange" type="xs:string"/>
+    <xs:attribute name="indexRangeExact" type="xs:boolean" default="false"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Multiple Segment information base -->
+  <xs:complexType name="MultipleSegmentBaseType">
+    <xs:complexContent>
+      <xs:extension base="SegmentBaseType">
+        <xs:sequence>
+          <xs:element name="SegmentTimeline" type="SegmentTimelineType" minOccurs="0"/>
+          <xs:element name="BitstreamSwitching" type="URLType" minOccurs="0"/>
+        </xs:sequence>
+        <xs:attribute name="duration" type="xs:unsignedInt"/>
+        <xs:attribute name="startNumber" type="xs:unsignedInt"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- Segment Info item URL/range -->
+  <xs:complexType name="URLType">
+    <xs:sequence>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="sourceURL" type="xs:anyURI"/>
+    <xs:attribute name="range" type="xs:string"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Segment List -->
+  <xs:complexType name="SegmentListType">
+    <xs:complexContent>
+      <xs:extension base="MultipleSegmentBaseType">
+        <xs:sequence>
+          <xs:element name="SegmentURL" type="SegmentURLType" minOccurs="0" maxOccurs="unbounded"/>
+        </xs:sequence>
+        <xs:attribute ref="xlink:href"/>
+        <xs:attribute ref="xlink:actuate" default="onRequest"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- Segment URL  -->
+  <xs:complexType name="SegmentURLType">
+    <xs:sequence>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="media" type="xs:anyURI"/>
+    <xs:attribute name="mediaRange" type="xs:string"/>
+    <xs:attribute name="index" type="xs:anyURI"/>
+    <xs:attribute name="indexRange" type="xs:string"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Segment Template -->
+  <xs:complexType name="SegmentTemplateType">
+    <xs:complexContent>
+      <xs:extension base="MultipleSegmentBaseType">
+        <xs:attribute name="media" type="xs:string"/>
+        <xs:attribute name="index" type="xs:string"/>
+        <xs:attribute name="initialization" type="xs:string" />
+        <xs:attribute name="bitstreamSwitching" type="xs:string" />
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- Segment Timeline -->
+  <xs:complexType name="SegmentTimelineType">
+    <xs:sequence>
+      <xs:element name="S" minOccurs="1" maxOccurs="unbounded" >
+        <xs:complexType>
+          <xs:attribute name="t" type="xs:unsignedInt"/>
+          <xs:attribute name="d" type="xs:unsignedInt" use="required"/>
+          <xs:attribute name="r" type="xs:unsignedInt" use="optional" default="0"/>
+          <xs:anyAttribute namespace="##other" processContents="lax"/>
+        </xs:complexType>
+      </xs:element>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Whitespace-separated list of strings -->
+  <xs:simpleType name="StringVectorType">
+    <xs:list itemType="xs:string"/>
+  </xs:simpleType>
+
+  <!-- Whitespace-separated list of unsigned integers -->
+  <xs:simpleType name="UIntVectorType">
+    <xs:list itemType="xs:unsignedInt"/>
+  </xs:simpleType>
+
+  <!-- Base URL -->
+  <xs:complexType name="BaseURLType">
+    <xs:simpleContent>
+      <xs:extension base="xs:anyURI">
+        <xs:attribute name="serviceLocation" type="xs:string"/>
+        <xs:attribute name="byteRange" type="xs:string"/>
+        <xs:anyAttribute namespace="##other" processContents="lax"/>
+      </xs:extension>
+    </xs:simpleContent>
+  </xs:complexType>
+
+  <!-- Program Information -->
+  <xs:complexType name="ProgramInformationType">
+    <xs:sequence>
+      <xs:element name="Title" type="xs:string" minOccurs="0"/>
+      <xs:element name="Source" type="xs:string" minOccurs="0"/>
+      <xs:element name="Copyright" type="xs:string" minOccurs="0"/>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="lang" type="xs:language"/>
+    <xs:attribute name="moreInformationURL" type="xs:anyURI"/>
+		<xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Descriptor -->
+  <xs:complexType name="DescriptorType">
+    <xs:sequence>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="schemeIdUri" type="xs:anyURI" use="required"/>
+    <xs:attribute name="value" type="xs:string"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Metrics -->
+  <xs:complexType name="MetricsType">
+    <xs:sequence>
+      <xs:element name="Reporting" type="DescriptorType" maxOccurs="unbounded"/>
+      <xs:element name="Range" type="RangeType" minOccurs="0" maxOccurs="unbounded"/>
+      <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="metrics" type="xs:string" use="required"/>
+    <xs:anyAttribute namespace="##other" processContents="lax"/>
+  </xs:complexType>
+
+  <!-- Metrics Range -->
+  <xs:complexType name="RangeType">
+    <xs:attribute name="starttime" type="xs:duration"/>
+    <xs:attribute name="duration" type="xs:duration"/>
+  </xs:complexType>
+
+</xs:schema>
+

mpd/test/schema/xlink.xsd

@@ -0,0 +1,270 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.w3.org/1999/xlink" xmlns:xlink="http://www.w3.org/1999/xlink">
+ 
+ <xs:annotation>
+  <xs:documentation>This schema document provides attribute declarations and
+attribute group, complex type and simple type definitions which can be used in
+the construction of user schemas to define the structure of particular linking
+constructs, e.g.
+<![CDATA[
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           xmlns:xl="http://www.w3.org/1999/xlink">
+
+ <xs:import namespace="http://www.w3.org/1999/xlink"
+            location="http://www.w3.org/1999/xlink.xsd">
+
+ <xs:element name="mySimple">
+  <xs:complexType>
+   ...
+   <xs:attributeGroup ref="xl:simpleAttrs"/>
+   ...
+  </xs:complexType>
+ </xs:element>
+ ...
+</xs:schema>]]></xs:documentation>
+ </xs:annotation>
+
+ <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="xml.xsd"/>
+
+ <xs:attribute name="type" type="xlink:typeType"/>
+
+ <xs:simpleType name="typeType">
+  <xs:restriction base="xs:token">
+   <xs:enumeration value="simple"/>
+   <xs:enumeration value="extended"/>
+   <xs:enumeration value="title"/>
+   <xs:enumeration value="resource"/>
+   <xs:enumeration value="locator"/>
+   <xs:enumeration value="arc"/>
+  </xs:restriction>
+ </xs:simpleType>
+
+ <xs:attribute name="href" type="xlink:hrefType"/>
+
+ <xs:simpleType name="hrefType">
+  <xs:restriction base="xs:anyURI"/>
+ </xs:simpleType>
+
+ <xs:attribute name="role" type="xlink:roleType"/>
+
+ <xs:simpleType name="roleType">
+  <xs:restriction base="xs:anyURI">
+   <xs:minLength value="1"/>
+  </xs:restriction>
+ </xs:simpleType>
+
+ <xs:attribute name="arcrole" type="xlink:arcroleType"/>
+
+ <xs:simpleType name="arcroleType">
+  <xs:restriction base="xs:anyURI">
+   <xs:minLength value="1"/>
+  </xs:restriction>
+ </xs:simpleType>
+
+ <xs:attribute name="title" type="xlink:titleAttrType"/>
+
+ <xs:simpleType name="titleAttrType">
+  <xs:restriction base="xs:string"/>
+ </xs:simpleType>
+
+ <xs:attribute name="show" type="xlink:showType"/>
+
+ <xs:simpleType name="showType">
+  <xs:restriction base="xs:token">
+   <xs:enumeration value="new"/>
+   <xs:enumeration value="replace"/>
+   <xs:enumeration value="embed"/>
+   <xs:enumeration value="other"/>
+   <xs:enumeration value="none"/>
+  </xs:restriction>
+ </xs:simpleType>
+
+ <xs:attribute name="actuate" type="xlink:actuateType"/>
+
+ <xs:simpleType name="actuateType">
+  <xs:restriction base="xs:token">
+   <xs:enumeration value="onLoad"/>
+   <xs:enumeration value="onRequest"/>
+   <xs:enumeration value="other"/>
+   <xs:enumeration value="none"/>
+  </xs:restriction>
+ </xs:simpleType>
+
+ <xs:attribute name="label" type="xlink:labelType"/>
+
+ <xs:simpleType name="labelType">
+  <xs:restriction base="xs:NCName"/>
+ </xs:simpleType>
+
+ <xs:attribute name="from" type="xlink:fromType"/>
+
+ <xs:simpleType name="fromType">
+  <xs:restriction base="xs:NCName"/>
+ </xs:simpleType>
+
+ <xs:attribute name="to" type="xlink:toType"/>
+
+ <xs:simpleType name="toType">
+  <xs:restriction base="xs:NCName"/>
+ </xs:simpleType>
+
+ <xs:attributeGroup name="simpleAttrs">
+  <xs:attribute ref="xlink:type" fixed="simple"/>
+  <xs:attribute ref="xlink:href"/>
+  <xs:attribute ref="xlink:role"/>
+  <xs:attribute ref="xlink:arcrole"/>
+  <xs:attribute ref="xlink:title"/>
+  <xs:attribute ref="xlink:show"/>
+  <xs:attribute ref="xlink:actuate"/>
+ </xs:attributeGroup>
+
+ <xs:group name="simpleModel">
+  <xs:sequence>
+   <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xs:sequence>
+ </xs:group>
+
+ <xs:complexType mixed="true" name="simple">
+  <xs:annotation>
+   <xs:documentation>
+    Intended for use as the type of user-declared elements to make them
+    simple links.
+   </xs:documentation>
+  </xs:annotation>
+  <xs:group ref="xlink:simpleModel"/>
+  <xs:attributeGroup ref="xlink:simpleAttrs"/>
+ </xs:complexType>
+
+ <xs:attributeGroup name="extendedAttrs">
+  <xs:attribute ref="xlink:type" fixed="extended" use="required"/>
+  <xs:attribute ref="xlink:role"/>
+  <xs:attribute ref="xlink:title"/>
+ </xs:attributeGroup>
+
+ <xs:group name="extendedModel">
+   <xs:choice>
+    <xs:element ref="xlink:title"/>
+    <xs:element ref="xlink:resource"/>
+    <xs:element ref="xlink:locator"/>
+    <xs:element ref="xlink:arc"/>
+  </xs:choice>
+ </xs:group>
+
+ <xs:complexType name="extended">
+  <xs:annotation>
+   <xs:documentation>
+    Intended for use as the type of user-declared elements to make them
+    extended links.
+    Note that the elements referenced in the content model are all abstract.
+    The intention is that by simply declaring elements with these as their
+    substitutionGroup, all the right things will happen.
+   </xs:documentation>
+  </xs:annotation>
+  <xs:group ref="xlink:extendedModel" minOccurs="0" maxOccurs="unbounded"/>
+  <xs:attributeGroup ref="xlink:extendedAttrs"/>
+ </xs:complexType>
+
+ <xs:element name="title" type="xlink:titleEltType" abstract="true"/>
+
+ <xs:attributeGroup name="titleAttrs">
+  <xs:attribute ref="xlink:type" fixed="title" use="required"/>
+  <xs:attribute ref="xml:lang">
+   <xs:annotation>
+    <xs:documentation>
+     xml:lang is not required, but provides much of the
+     motivation for title elements in addition to attributes, and so
+     is provided here for convenience.
+    </xs:documentation>
+   </xs:annotation>
+  </xs:attribute>
+ </xs:attributeGroup>
+
+ <xs:group name="titleModel">
+  <xs:sequence>
+   <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xs:sequence>
+ </xs:group>
+
+ <xs:complexType mixed="true" name="titleEltType">
+  <xs:group ref="xlink:titleModel"/>
+  <xs:attributeGroup ref="xlink:titleAttrs"/>
+ </xs:complexType>
+
+ <xs:element name="resource" type="xlink:resourceType" abstract="true"/>
+
+ <xs:attributeGroup name="resourceAttrs">
+  <xs:attribute ref="xlink:type" fixed="resource" use="required"/>
+  <xs:attribute ref="xlink:role"/>
+  <xs:attribute ref="xlink:title"/>
+  <xs:attribute ref="xlink:label"/>
+ </xs:attributeGroup>
+
+ <xs:group name="resourceModel">
+  <xs:sequence>
+   <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xs:sequence>
+ </xs:group>
+
+ <xs:complexType mixed="true" name="resourceType">
+  <xs:group ref="xlink:resourceModel"/>
+  <xs:attributeGroup ref="xlink:resourceAttrs"/>
+ </xs:complexType>
+
+ <xs:element name="locator" type="xlink:locatorType" abstract="true"/>
+
+ <xs:attributeGroup name="locatorAttrs">
+  <xs:attribute ref="xlink:type" fixed="locator" use="required"/>
+  <xs:attribute ref="xlink:href" use="required"/>
+  <xs:attribute ref="xlink:role"/>
+  <xs:attribute ref="xlink:title"/>
+  <xs:attribute ref="xlink:label">
+   <xs:annotation>
+    <xs:documentation>
+     label is not required, but locators have no particular
+     XLink function if they are not labeled.
+    </xs:documentation>
+   </xs:annotation>
+  </xs:attribute>
+ </xs:attributeGroup>
+
+ <xs:group name="locatorModel">
+  <xs:sequence>
+   <xs:element ref="xlink:title" minOccurs="0" maxOccurs="unbounded"/>
+  </xs:sequence>
+ </xs:group>
+
+ <xs:complexType name="locatorType">
+  <xs:group ref="xlink:locatorModel"/>
+  <xs:attributeGroup ref="xlink:locatorAttrs"/>
+ </xs:complexType>
+
+ <xs:element name="arc" type="xlink:arcType" abstract="true"/>
+
+ <xs:attributeGroup name="arcAttrs">
+  <xs:attribute ref="xlink:type" fixed="arc" use="required"/>
+  <xs:attribute ref="xlink:arcrole"/>
+  <xs:attribute ref="xlink:title"/>
+  <xs:attribute ref="xlink:show"/>
+  <xs:attribute ref="xlink:actuate"/>
+  <xs:attribute ref="xlink:from"/>
+  <xs:attribute ref="xlink:to">
+   <xs:annotation>
+    <xs:documentation>
+     from and to have default behavior when values are missing
+    </xs:documentation>
+   </xs:annotation>
+  </xs:attribute>
+ </xs:attributeGroup>
+
+ <xs:group name="arcModel">
+  <xs:sequence>
+   <xs:element ref="xlink:title" minOccurs="0" maxOccurs="unbounded"/>
+  </xs:sequence>
+ </xs:group>
+
+ <xs:complexType name="arcType">
+  <xs:group ref="xlink:arcModel"/>
+  <xs:attributeGroup ref="xlink:arcAttrs"/>
+ </xs:complexType>
+
+</xs:schema>

mpd/test/schema/xml.xsd

@@ -0,0 +1,117 @@
+<?xml version='1.0'?>
+<!DOCTYPE xs:schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "XMLSchema.dtd" >
+<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="en">
+
+ <xs:annotation>
+  <xs:documentation>
+   See http://www.w3.org/XML/1998/namespace.html and
+   http://www.w3.org/TR/REC-xml for information about this namespace.
+
+    This schema document describes the XML namespace, in a form
+    suitable for import by other schema documents.  
+
+    Note that local names in this namespace are intended to be defined
+    only by the World Wide Web Consortium or its subgroups.  The
+    following names are currently defined in this namespace and should
+    not be used with conflicting semantics by any Working Group,
+    specification, or document instance:
+
+    base (as an attribute name): denotes an attribute whose value
+         provides a URI to be used as the base for interpreting any
+         relative URIs in the scope of the element on which it
+         appears; its value is inherited.  This name is reserved
+         by virtue of its definition in the XML Base specification.
+
+    lang (as an attribute name): denotes an attribute whose value
+         is a language code for the natural language of the content of
+         any element; its value is inherited.  This name is reserved
+         by virtue of its definition in the XML specification.
+  
+    space (as an attribute name): denotes an attribute whose
+         value is a keyword indicating what whitespace processing
+         discipline is intended for the content of the element; its
+         value is inherited.  This name is reserved by virtue of its
+         definition in the XML specification.
+
+    Father (in any context at all): denotes Jon Bosak, the chair of 
+         the original XML Working Group.  This name is reserved by 
+         the following decision of the W3C XML Plenary and 
+         XML Coordination groups:
+
+             In appreciation for his vision, leadership and dedication
+             the W3C XML Plenary on this 10th day of February, 2000
+             reserves for Jon Bosak in perpetuity the XML name
+             xml:Father
+  </xs:documentation>
+ </xs:annotation>
+
+ <xs:annotation>
+  <xs:documentation>This schema defines attributes and an attribute group
+        suitable for use by
+        schemas wishing to allow xml:base, xml:lang or xml:space attributes
+        on elements they define.
+
+        To enable this, such a schema must import this schema
+        for the XML namespace, e.g. as follows:
+        &lt;schema . . .>
+         . . .
+         &lt;import namespace="http://www.w3.org/XML/1998/namespace"
+                    schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>
+
+        Subsequently, qualified reference to any of the attributes
+        or the group defined below will have the desired effect, e.g.
+
+        &lt;type . . .>
+         . . .
+         &lt;attributeGroup ref="xml:specialAttrs"/>
+ 
+         will define a type which will schema-validate an instance
+         element with any of those attributes</xs:documentation>
+ </xs:annotation>
+
+ <xs:annotation>
+  <xs:documentation>In keeping with the XML Schema WG's standard versioning
+   policy, this schema document will persist at
+   http://www.w3.org/2001/03/xml.xsd.
+   At the date of issue it can also be found at
+   http://www.w3.org/2001/xml.xsd.
+   The schema document at that URI may however change in the future,
+   in order to remain compatible with the latest version of XML Schema
+   itself.  In other words, if the XML Schema namespace changes, the version
+   of this document at
+   http://www.w3.org/2001/xml.xsd will change
+   accordingly; the version at
+   http://www.w3.org/2001/03/xml.xsd will not change.
+  </xs:documentation>
+ </xs:annotation>
+
+ <xs:attribute name="lang" type="xs:language">
+  <xs:annotation>
+   <xs:documentation>In due course, we should install the relevant ISO 2- and 3-letter
+         codes as the enumerated possible values . . .</xs:documentation>
+  </xs:annotation>
+ </xs:attribute>
+
+ <xs:attribute name="space" default="preserve">
+  <xs:simpleType>
+   <xs:restriction base="xs:NCName">
+    <xs:enumeration value="default"/>
+    <xs:enumeration value="preserve"/>
+   </xs:restriction>
+  </xs:simpleType>
+ </xs:attribute>
+
+ <xs:attribute name="base" type="xs:anyURI">
+  <xs:annotation>
+   <xs:documentation>See http://www.w3.org/TR/xmlbase/ for
+                     information about this attribute.</xs:documentation>
+  </xs:annotation>
+ </xs:attribute>
+
+ <xs:attributeGroup name="specialAttrs">
+  <xs:attribute ref="xml:base"/>
+  <xs:attribute ref="xml:lang"/>
+  <xs:attribute ref="xml:space"/>
+ </xs:attributeGroup>
+
+</xs:schema>