<!--  
Rich Site Summary (RSS) 0.91 official DTD, proposed.  
RSS is an XML vocabulary for describing  
metadata about websites, and enabling the display of  
"channels" on the "My Netscape" website.  
RSS Info can be found at http://my.netscape.com/publish/  
XML Info can be found at http://www.w3.org/XML/  
copyright Netscape Communications, 1999  
Dan Libby - [email protected]  
Based on RSS DTD originally created by  
Lars Marius Garshol - [email protected].  
: rss-spec-0.91.html,v 1.1.2.2 2001/11/09 08:10:07 dprusak Exp $  
-->  
<!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+)>  
<!--  
Copied from HTML 3.2 DTD, with modifications (removed CDATA)  
http://www.w3.org/TR/REC-html32.html#dtd  
=============== BEGIN ===================  
-->  
<!--  
Character Entities for ISO Latin-1  
(C) International Organization for Standardization 1986  
Permission to copy in any form is granted for use with  
conforming SGML systems and applications as defined in  
ISO 8879, provided this notice is included in all copies.  
This has been extended for use with HTML to cover the full  
set of codes in the range 160-255 decimal.  
-->  
<!-- Character entity set. Typical invocation:  
<!ENTITY % ISOlat1 PUBLIC  
"ISO 8879-1986//ENTITIES Added Latin 1//EN//HTML">  
%ISOlat1;  
-->  
<!ENTITY nbsp " "> <!-- no-break space -->  
<!ENTITY iexcl "¡"> <!-- inverted exclamation mark -->  
<!ENTITY cent "¢"> <!-- cent sign -->  
<!ENTITY pound "£"> <!-- pound sterling sign -->  
<!ENTITY curren "¤"> <!-- general currency sign -->  
<!ENTITY yen "¥"> <!-- yen sign -->  
<!ENTITY brvbar "¦"> <!-- broken (vertical) bar -->  
<!ENTITY sect "§"> <!-- section sign -->  
<!ENTITY uml "¨"> <!-- umlaut (dieresis) -->  
<!ENTITY copy "©"> <!-- copyright sign -->  
<!ENTITY ordf "ª"> <!-- ordinal indicator, feminine -->  
<!ENTITY laquo "«"> <!-- angle quotation mark, left -->  
<!ENTITY not "¬"> <!-- not sign -->  
<!ENTITY shy "­"> <!-- soft hyphen -->  
<!ENTITY reg "®"> <!-- registered sign -->  
<!ENTITY macr "¯"> <!-- macron -->  
<!ENTITY deg "°"> <!-- degree sign -->  
<!ENTITY plusmn "±"> <!-- plus-or-minus sign -->  
<!ENTITY sup2 "²"> <!-- superscript two -->  
<!ENTITY sup3 "³"> <!-- superscript three -->  
<!ENTITY acute "´"> <!-- acute accent -->  
<!ENTITY micro "µ"> <!-- micro sign -->  
<!ENTITY para "¶"> <!-- pilcrow (paragraph sign) -->  
<!ENTITY middot "·"> <!-- middle dot -->  
<!ENTITY cedil "¸"> <!-- cedilla -->  
<!ENTITY sup1 "¹"> <!-- superscript one -->  
<!ENTITY ordm "º"> <!-- ordinal indicator, masculine -->  
<!ENTITY raquo "»"> <!-- angle quotation mark, right -->  
<!ENTITY frac14 "¼"> <!-- fraction one-quarter -->  
<!ENTITY frac12 "½"> <!-- fraction one-half -->  
<!ENTITY frac34 "¾"> <!-- fraction three-quarters -->  
<!ENTITY iquest "¿"> <!-- inverted question mark -->  
<!ENTITY Agrave "À"> <!-- capital A, grave accent -->  
<!ENTITY Aacute "Á"> <!-- capital A, acute accent -->  
<!ENTITY Acirc "Â"> <!-- capital A, circumflex accent -->  
<!ENTITY Atilde "Ã"> <!-- capital A, tilde -->  
<!ENTITY Auml "Ä"> <!-- capital A, dieresis or umlaut mark -->  
<!ENTITY Aring "Å"> <!-- capital A, ring -->  
<!ENTITY AElig "Æ"> <!-- capital AE diphthong (ligature) -->  
<!ENTITY Ccedil "Ç"> <!-- capital C, cedilla -->  
<!ENTITY Egrave "È"> <!-- capital E, grave accent -->  
<!ENTITY Eacute "É"> <!-- capital E, acute accent -->  
<!ENTITY Ecirc "Ê"> <!-- capital E, circumflex accent -->  
<!ENTITY Euml "Ë"> <!-- capital E, dieresis or umlaut mark -->  
<!ENTITY Igrave "Ì"> <!-- capital I, grave accent -->  
<!ENTITY Iacute "Í"> <!-- capital I, acute accent -->  
<!ENTITY Icirc "Î"> <!-- capital I, circumflex accent -->  
<!ENTITY Iuml "Ï"> <!-- capital I, dieresis or umlaut mark -->  
<!ENTITY ETH "Ð"> <!-- capital Eth, Icelandic -->  
<!ENTITY Ntilde "Ñ"> <!-- capital N, tilde -->  
<!ENTITY Ograve "Ò"> <!-- capital O, grave accent -->  
<!ENTITY Oacute "Ó"> <!-- capital O, acute accent -->  
<!ENTITY Ocirc "Ô"> <!-- capital O, circumflex accent -->  
<!ENTITY Otilde "Õ"> <!-- capital O, tilde -->  
<!ENTITY Ouml "Ö"> <!-- capital O, dieresis or umlaut mark -->  
<!ENTITY times "×"> <!-- multiply sign -->  
<!ENTITY Oslash "Ø"> <!-- capital O, slash -->  
<!ENTITY Ugrave "Ù"> <!-- capital U, grave accent -->  
<!ENTITY Uacute "Ú"> <!-- capital U, acute accent -->  
<!ENTITY Ucirc "Û"> <!-- capital U, circumflex accent -->  
<!ENTITY Uuml "Ü"> <!-- capital U, dieresis or umlaut mark -->  
<!ENTITY Yacute "Ý"> <!-- capital Y, acute accent -->  
<!ENTITY THORN "Þ"> <!-- capital THORN, Icelandic -->  
<!ENTITY szlig "ß"> <!-- small sharp s, German (sz ligature) -->  
<!ENTITY agrave "à"> <!-- small a, grave accent -->  
<!ENTITY aacute "á"> <!-- small a, acute accent -->  
<!ENTITY acirc "â"> <!-- small a, circumflex accent -->  
<!ENTITY atilde "ã"> <!-- small a, tilde -->  
<!ENTITY auml "ä"> <!-- small a, dieresis or umlaut mark -->  
<!ENTITY aring "å"> <!-- small a, ring -->  
<!ENTITY aelig "æ"> <!-- small ae diphthong (ligature) -->  
<!ENTITY ccedil "ç"> <!-- small c, cedilla -->  
<!ENTITY egrave "è"> <!-- small e, grave accent -->  
<!ENTITY eacute "é"> <!-- small e, acute accent -->  
<!ENTITY ecirc "ê"> <!-- small e, circumflex accent -->  
<!ENTITY euml "ë"> <!-- small e, dieresis or umlaut mark -->  
<!ENTITY igrave "ì"> <!-- small i, grave accent -->  
<!ENTITY iacute "í"> <!-- small i, acute accent -->  
<!ENTITY icirc "î"> <!-- small i, circumflex accent -->  
<!ENTITY iuml "ï"> <!-- small i, dieresis or umlaut mark -->  
<!ENTITY eth "ð"> <!-- small eth, Icelandic -->  
<!ENTITY ntilde "ñ"> <!-- small n, tilde -->  
<!ENTITY ograve "ò"> <!-- small o, grave accent -->  
<!ENTITY oacute "ó"> <!-- small o, acute accent -->  
<!ENTITY ocirc "ô"> <!-- small o, circumflex accent -->  
<!ENTITY otilde "õ"> <!-- small o, tilde -->  
<!ENTITY ouml "ö"> <!-- small o, dieresis or umlaut mark -->  
<!ENTITY divide "÷"> <!-- divide sign -->  
<!ENTITY oslash "ø"> <!-- small o, slash -->  
<!ENTITY ugrave "ù"> <!-- small u, grave accent -->  
<!ENTITY uacute "ú"> <!-- small u, acute accent -->  
<!ENTITY ucirc "û"> <!-- small u, circumflex accent -->  
<!ENTITY uuml "ü"> <!-- small u, dieresis or umlaut mark -->  
<!ENTITY yacute "ý"> <!-- small y, acute accent -->  
<!ENTITY thorn "þ"> <!-- small thorn, Icelandic -->  
<!ENTITY yuml "ÿ"> <!-- small y, dieresis or umlaut mark -->  
<!--  
Copied from HTML 3.2 DTD, with modifications (removed CDATA)  
http://www.w3.org/TR/REC-html32.html#dtd  
================= END ===================  
-->

<!--  
A DTD for Dan's Kinda Hacky XML Validation Format (DKHXVF)  
Basically, this format allows us to enforce some additional rules  
that DTD's do not. Specifically, we can:  
- specify min and max for number of each child element  
- specify a regular expression that text elements and attributes must match  
- specify type of text elements and attributes (int, float, string, timestamp)  
- specify min and max for any type. (length compare for strings, numeric otherwise)  
The hope is that this will allow the rapid creation of new formats, and modification  
of existing formats (adding/removing tags, attributes etc), without requiring  
code changes in the validation software.  
This is not in any way intended to be an alternative to XML schemas. In the  
absence of code supporting XML schemas, I created this, but it is meant as  
a transitional work only.  
For more on XML schemas, see:  
http://www.w3.org/1999/05/06-xmlschema-1/ and  
http://www.w3.org/1999/05/06-xmlschema-2/  
This is also not meant to replace DTDs. There are many things that you can do  
with DTDs that you cannot do with this format. For example, you cannot declare  
entities with this format. You must do that in the DTD. If you want your  
parser to interpret them correctly, you must use a validating parser.  
It is possible to use these schemas without DTD validation, however you may run  
into problems with entity expansion and other things.  
Dan Libby - [email protected]  
: rss-spec-0.91.html,v $  
Revision 1.1.2.2 2001/11/09 08:10:07 dprusak  
Merged for 6.2  
  
Revision 1.1.2.1 2001/10/17 22:25:28 dprusak  
NewMyNetscape  
Revision 1.1.2.1 2001/05/03 00:44:50 hoangtv  
adding DTD definition  
Revision 1.4 1999/09/10 03:01:44 jquach  
removed comments  
Revision 1.3 1999/09/10 03:01:24 jquach  
pulled ref to internal file  
Revision 1.2 1999/08/07 04:53:02 danda  
'cleaning' (removing useful info) for public release  
Revision 1.3 1999/08/07 04:52:12 danda  
'cleaning' (removing useful info) for public release  
Revision 1.2 1999/07/22 07:09:41 danda  
fixing examples, RDF Site Summary -> Rich Site Summary  
Revision 1.1 1999/06/09 07:01:29 danda  
adding schema and dtd for rss 0.9 and 1.0  
-->  
<!--  
Tag: Schema  
Description: Document wrapper.  
Sub tags: Element & Attribute  
Attributes: version, root, name  
Notes:  
version must be "DKHXVF 1.0"  
root is the document root.  
-->  
<!ELEMENT Schema (Element | Attribute)*>  
<!ATTLIST Schema  
    version CDATA #FIXED "DKHXVF 1.0"  
    root CDATA #REQUIRED  
    name CDATA #REQUIRED>  
<!--  
Tag: Element  
Description: Definition of an allowed element (tag)  
Sub tags: Contains, Attrib, Matches  
Attributes: id, type, min, max, exactly  
Notes: exactly="1" is equivalent to min="1" max="1"  
-->  
<!ELEMENT Element ((Contains | Attrib)* | Matches?)>  
<!ATTLIST Element  
    id CDATA #REQUIRED  
    type (int | float | container | string | timestamp) #REQUIRED  
    min CDATA #IMPLIED  
    max CDATA #IMPLIED  
    exactly CDATA #IMPLIED>  
<!--  
Tag: Contains  
Description: Defines rules for a sub-element.  
Sub tags: None, this tag must be empty.  
Attributes: ref, min, max, exactly  
Notes: ref must refer to the 'id' of an element defined elsewhere or the schema  
is invalid.  
-->  
<!ELEMENT Contains EMPTY>  
<!ATTLIST Contains  
    ref CDATA #REQUIRED  
    min CDATA #IMPLIED  
    max CDATA #IMPLIED  
    exactly CDATA #IMPLIED>  
<!--  
Tag: Attrib  
Description: Defines rules for an element attribute.  
Sub tags: None, this tag must be empty  
Attributes: ref, min, max, exactly  
Notes: ref must refer to the 'id' of an Attribute defined elsewhere or the schema  
is invalid.  
-->  
<!ELEMENT Attrib EMPTY>  
<!ATTLIST Attrib  
    ref CDATA #REQUIRED  
    min CDATA #IMPLIED  
    max CDATA #IMPLIED  
    exactly CDATA #IMPLIED>  
<!--  
Tag: Attribute  
Description: Definition of an allowed attribute  
Sub tags: Matches  
Attributes: id, type, min, max, exactly  
Notes: none  
-->  
<!ELEMENT Attribute (Matches?)>  
<!ATTLIST Attribute  
    id CDATA #REQUIRED  
    type (int | float | string | timestamp) #REQUIRED  
    min CDATA #IMPLIED  
    max CDATA #IMPLIED  
    exactly CDATA #IMPLIED>  
<!--  
Tag: Matches  
Description: A regular expression that values will be compared against  
Sub tags: None  
Attributes: None  
Notes: Matches may be used for elements of any type but container, and for attributes.  
An example of a useful matching pattern is:  
<Matches>^(foo|bar|foobar)$</Matches>  
This will allow any values that exactly match "foo", "bar", or "foobar".  
Whitespace is allowed in the regex and '#' is used for comments. The following  
is valid:  
<Matches>  
&# # Start of a numeric entity reference, xml escaped &  
(?P<char> # xml escaped <, >  
[0-9]+[^0-9] # Decimal form  
| 0[0-7]+[^0-7] # Octal form  
| x[0-9a-fA-F]+[^0-9a-fA-F] # Hexadecimal form  
)  
</Matches>  
which is equivalent to: <Matches>&#(?P<char>[0-9]+[^0-9]| 0[0-7]+[^0-7]| x[0-9a-fA-F]+[^0-9a-fA-F])</Matches>  
For help on regular expressions, see:  
http://www.python.org/doc/howto/regex/regex.html or  
http://www.ciser.cornell.edu/info/regex.html  
-->  
<!ELEMENT Matches (#PCDATA)>  
<!--  
Example of a DKHXVF 1.0 file:  
<?xml version="1.0"?>
<!DOCTYPE Schema
  PUBLIC '-//Netscape Communications//DTD Schema 1.0//EN'
  'http://my.netscape.com/publish/formats/schema-1.0.dtd'>
<Schema name="RSS 0.9" root="rdf:RDF" version="DKHXVF 1.0">
    <Element id="rdf:RDF" type="container">
        <Contains exactly="1" ref="channel"/>
        <Contains max="1" min="0" ref="image"/>
        <Contains max="15" min="1" ref="item"/>
        <Contains max="1" min="0" ref="textinput"/>
        <Attrib exactly="1" ref="xmlns"/>
        <Attrib exactly="1" ref="xmlns:rdf"/>
    </Element>
    <Attribute id="xmlns" type="string">
        <Matches>http://my.netscape.com/rdf/simple/0.9/</Matches>
    </Attribute>
    <Attribute id="xmlns:rdf" type="string">
        <Matches>http://www.w3.org/1999/02/22-rdf-syntax-ns#</Matches>
    </Attribute>
    <Element id="channel" type="container">
        <Contains exactly="1" ref="link"/>
        <Contains exactly="1" ref="title"/>
        <Contains exactly="1" ref="description"/>
    </Element>
    <Element id="item" type="container">
        <Contains exactly="1" ref="title"/>
        <Contains exactly="1" ref="link"/>
    </Element>
    <Element id="image" type="container">
        <Contains exactly="1" ref="title"/>
        <Contains exactly="1" ref="link"/>
        <Contains exactly="1" ref="url"/>
    </Element>
    <Element id="textinput" type="container">
        <Contains exactly="1" ref="title"/>
        <Contains exactly="1" ref="description"/>
        <Contains exactly="1" ref="link"/>
        <Contains exactly="1" ref="name"/>
    </Element>
    <Element id="title" max="100" min="1" type="string"/>
    <Element id="description" max="500" min="1" type="string"/>
    <Element id="url" max="500" min="1" type="string">
        <Matches>^(http://|^ftp://)</Matches>
    </Element>
    <Element id="link" max="500" min="1" type="string">
        <Matches>^(http://|^ftp://)</Matches>
    </Element>
    <Element id="name" max="20" min="1" type="string"/>
</Schema>
-->