brief about converting DTD to XML Schema

1. Prepared By: Dr.Saranya K.G
Converting DTDs to XML Schemas
<!ELEMENT rss (channel)>
<!ATTLIST rss
version CDATA #REQUIRED> <!-- must be "0.91"> -->
<!ELEMENT channel (title | description | link | language | item+ | rating? | image? |
textinput? | copyright? | pubDate? | lastBuildDate? | docs? | managingEditor? |
webMaster? | skipHours? | skipDays?)*>
<!ELEMENT title (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT link (#PCDATA)>
<!ELEMENT image (title | url | link | width? | height? | description?)*>
<!ELEMENT url (#PCDATA)>
<!ELEMENT item (title | link | description)*>
<!ELEMENT textinput (title | description | name | link)*>
<!ELEMENT name (#PCDATA)>
<!ELEMENT rating (#PCDATA)>
<!ELEMENT language (#PCDATA)>
<!ELEMENT width (#PCDATA)>
<!ELEMENT height (#PCDATA)>
<!ELEMENT copyright (#PCDATA)>
<!ELEMENT pubDate (#PCDATA)>
<!ELEMENT lastBuildDate (#PCDATA)>
<!ELEMENT docs (#PCDATA)>
<!ELEMENT managingEditor (#PCDATA)>
<!ELEMENT webMaster (#PCDATA)>
<!ELEMENT hour (#PCDATA)>
<!ELEMENT day (#PCDATA)>
<!ELEMENT skipHours (hour+)>
<!ELEMENT skipDays (day+)>

2. Prepared By: Dr.Saranya K.G
<schema
xmlns='http://www.w3.org/1999/XMLSchema'
targetNamespace='http://purl.org/rss/0.91'
xmlns:rss='http://purl.org/rss/0.91'>
<element name='rss'>
<complexType content='elementOnly'>
<element ref='rss:channel'/>
<attribute name='version' type='string' use='required'/>
</complexType>
</element>
<element name='channel'>
<complexType content='elementOnly'>
<choice minOccurs='0' maxOccurs='unbounded'>
<element ref='rss:title'/>
<element ref='rss:description'/>
<element ref='rss:link'/>
<element ref='rss:language'/>
<element ref='rss:item'/>
<element ref='rss:+'/>
<element ref='rss:rating'/>
<element ref='rss:?'/>
<element ref='rss:image'/>
<element ref='rss:?'/>
<element ref='rss:textinput'/>
<element ref='rss:?'/>
<element ref='rss:copyright'/>
<element ref='rss:?'/>
<element ref='rss:pubDate'/>
<element ref='rss:?'/>
<element ref='rss:lastBuildDate'/>
<element ref='rss:?'/>
<element ref='rss:docs'/>
<element ref='rss:?'/>
<element ref='rss:managingEditor'/>
<element ref='rss:?'/>
<element ref='rss:webMaster'/>
<element ref='rss:?'/>
<element ref='rss:skipHours'/>
<element ref='rss:?'/>
<element ref='rss:skipDays'/>
<element ref='rss:?'/>
</choice>
</complexType>

3. Prepared By: Dr.Saranya K.G
</element>
<element name='title'>
<complexType content='mixed'>
</complexType>
</element>
<element name='description'>
<complexType content='mixed'>
</complexType>
</element>
<element name='link'>
<complexType content='mixed'>
</complexType>
</element>
<element name='image'>
<complexType content='elementOnly'>
<choice minOccurs='0' maxOccurs='unbounded'>
<element ref='rss:title'/>
<element ref='rss:url'/>
<element ref='rss:link'/>
<element ref='rss:width'/>
<element ref='rss:?'/>
<element ref='rss:height'/>
<element ref='rss:?'/>
<element ref='rss:description'/>
<element ref='rss:?'/>
</choice>
</complexType>
</element>
<element name='url'>
<complexType content='mixed'>
</complexType>
</element>
<element name='item'>
<complexType content='elementOnly'>
<choice minOccurs='0' maxOccurs='unbounded'>
<element ref='rss:title'/>
<element ref='rss:link'/>
<element ref='rss:description'/>
</choice>
</complexType>

4. Prepared By: Dr.Saranya K.G
</element>
<element name='textinput'>
<complexType content='elementOnly'>
<choice minOccurs='0' maxOccurs='unbounded'>
<element ref='rss:title'/>
<element ref='rss:description'/>
<element ref='rss:name'/>
<element ref='rss:link'/>
</choice>
</complexType>
</element>
<element name='name'>
<complexType content='mixed'>
</complexType>
</element>
<element name='rating'>
<complexType content='mixed'>
</complexType>
</element>
<element name='language'>
<complexType content='mixed'>
</complexType>
</element>
<element name='width'>
<complexType content='mixed'>
</complexType>
</element>
<element name='height'>
<complexType content='mixed'>
</complexType>
</element>
<element name='copyright'>
<complexType content='mixed'>
</complexType>
</element>
<element name='pubDate'>
<complexType content='mixed'>
</complexType>

5. Prepared By: Dr.Saranya K.G
</element>
<element name='lastBuildDate'>
<complexType content='mixed'>
</complexType>
</element>
<element name='docs'>
<complexType content='mixed'>
</complexType>
</element>
<element name='managingEditor'>
<complexType content='mixed'>
</complexType>
</element>
<element name='webMaster'>
<complexType content='mixed'>
</complexType>
</element>
<element name='hour'>
<complexType content='mixed'>
</complexType>
</element>
<element name='day'>
<complexType content='mixed'>
</complexType>
</element>
<element name='skipHours'>
<complexType content='elementOnly'>
<element ref='rss:hour' maxOccurs='unbounded'/>
</complexType>
</element>
<element name='skipDays'>
<complexType content='elementOnly'>
<element ref='rss:day' maxOccurs='unbounded'/>
</complexType>
</element>
</schema>

6. Prepared By: Dr.Saranya K.G
Sample DTD
<!ELEMENT root (foo|(bar,baz)+)*>
<!ATTLIST root version CDATA #FIXED '1.0'>
<!ELEMENT foo EMPTY>
<!ELEMENT bar (#PCDATA)>
<!ELEMENT baz (#PCDATA|mumble)*>
<!ELEMENT mumble ANY>
XML Schema grammar:
<?xml version="1.0" encoding="UTF-8" ?>
<!-- Generated from data/dtd/test.dtd -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<!-- <!ELEMENT root (foo|(bar,baz)+)*> -->
<xsd:element name="root">
<xsd:complexType>
<xsd:choice minOccurs="0" maxOccurs="unbounded">
<xsd:element ref="foo" />
<xsd:sequence minOccurs="1" maxOccurs="unbounded">
<xsd:element ref="bar" />
<xsd:element ref="baz" />
</xsd:sequence>
</xsd:choice>
<!-- <!ATTLIST root version CDATA #FIXED "1.0"> -->
<xsd:attribute name="version" fixed="1.0">
<xsd:simpleType>
<xsd:restriction base="xsd:string" />

7. Prepared By: Dr.Saranya K.G
</xsd:simpleType>
</xsd:attribute>
</xsd:complexType>
</xsd:element>
...
</xsd:schema>