文件来源于w3.org，是官方文档。不过没找到加密模型的DTD。要是有人找到了，希望也共享一下，或者是发一份给我，我来帮你共享！
为了怕下载不了，我把内容同时也帖下来。
<!-- DTD for XML Signatures
http://www.w3.org/2000/09/xmldsig#
Joseph Reagle $last changed 20001215$
http://www.w3.org/2000/09/xmldsig#
$Revision: 1.1 $ on $Date: 2002/02/08 20:32:26 $ by $Author: reagle $
Copyright 2001 The Internet Society and W3C (Massachusetts Institute
of Technology, Institut National de Recherche en Informatique et en
Automatique, Keio University). All Rights Reserved.
http://www.w3.org/Consortium/Legal/
This document is governed by the W3C Software License [1] as described
in the FAQ [2].
[1] http://www.w3.org/Consortium/Legal/copyright-software-19980720
[2] http://www.w3.org/Consortium/Legal/IPR-FAQ-20000620.html#DTD
-->
<!--
The following entity declarations enable external/flexible content in
the Signature content model.
#PCDATA emulates schema string; when combined with element types it
emulates schema's mixed content type.
%foo.ANY permits the user to include their own element types from
other namespaces, for example:
<!ENTITY % KeyValue.ANY '| ecds:ECDSAKeyValue'>
...
<!ELEMENT ecds:ECDSAKeyValue (#PCDATA) >
-->
<!ENTITY % Object.ANY ''>
<!ENTITY % Method.ANY ''>
<!ENTITY % Transform.ANY ''>
<!ENTITY % SignatureProperty.ANY ''>
<!ENTITY % KeyInfo.ANY ''>
<!ENTITY % KeyValue.ANY ''>
<!ENTITY % PGPData.ANY ''>
<!ENTITY % X509Data.ANY ''>
<!ENTITY % SPKIData.ANY ''>
<!-- Start Core Signature declarations, these should NOT be altered -->
<!ELEMENT Signature (SignedInfo, SignatureValue, KeyInfo?, Object*) >
<!ATTLIST Signature
xmlns CDATA #FIXED 'http://www.w3.org/2000/09/xmldsig#'
Id ID #IMPLIED >
<!ELEMENT SignatureValue (#PCDATA) >
<!ATTLIST SignatureValue
Id ID #IMPLIED>
<!ELEMENT SignedInfo (CanonicalizationMethod,
SignatureMethod, Reference+) >
<!ATTLIST SignedInfo
Id ID #IMPLIED
>
<!ELEMENT CanonicalizationMethod (#PCDATA %Method.ANY;)* >
<!ATTLIST CanonicalizationMethod
Algorithm CDATA #REQUIRED >
<!ELEMENT SignatureMethod (#PCDATA|HMACOutputLength %Method.ANY;)* >
<!ATTLIST SignatureMethod
Algorithm CDATA #REQUIRED >
<!ELEMENT Reference (Transforms?, DigestMethod, DigestValue) >
<!ATTLIST Reference
Id ID #IMPLIED
URI CDATA #IMPLIED
Type CDATA #IMPLIED>
<!ELEMENT Transforms (Transform+)>
<!ELEMENT Transform (#PCDATA|XPath %Transform.ANY;)* >
<!ATTLIST Transform
Algorithm CDATA #REQUIRED >
<!ELEMENT XPath (#PCDATA) >
<!ELEMENT DigestMethod (#PCDATA %Method.ANY;)* >
<!ATTLIST DigestMethod
Algorithm CDATA #REQUIRED >
<!ELEMENT DigestValue (#PCDATA) >
<!ELEMENT KeyInfo (#PCDATA|KeyName|KeyValue|RetrievalMethod|
X509Data|PGPData|SPKIData|MgmtData %KeyInfo.ANY;)* >
<!ATTLIST KeyInfo
Id ID #IMPLIED >
<!-- Key Information -->
<!ELEMENT KeyName (#PCDATA) >
<!ELEMENT KeyValue (#PCDATA|DSAKeyValue|RSAKeyValue %KeyValue.ANY;)* >
<!ELEMENT MgmtData (#PCDATA) >
<!ELEMENT RetrievalMethod (Transforms?) >
<!ATTLIST RetrievalMethod
URI CDATA #REQUIRED
Type CDATA #IMPLIED >
<!-- X.509 Data -->
<!ELEMENT X509Data ((X509IssuerSerial | X509SKI | X509SubjectName |
X509Certificate | X509CRL )+ %X509Data.ANY;)>
<!ELEMENT X509IssuerSerial (X509IssuerName, X509SerialNumber) >
<!ELEMENT X509IssuerName (#PCDATA) >
<!ELEMENT X509SubjectName (#PCDATA) >
<!ELEMENT X509SerialNumber (#PCDATA) >
<!ELEMENT X509SKI (#PCDATA) >
<!ELEMENT X509Certificate (#PCDATA) >
<!ELEMENT X509CRL (#PCDATA) >
<!-- PGPData -->
<!ELEMENT PGPData ((PGPKeyID, PGPKeyPacket?) | (PGPKeyPacket) %PGPData.ANY;) >
<!ELEMENT PGPKeyPacket (#PCDATA) >
<!ELEMENT PGPKeyID (#PCDATA) >
<!-- SPKI Data -->
<!ELEMENT SPKIData (SPKISexp %SPKIData.ANY;) >
<!ELEMENT SPKISexp (#PCDATA) >
<!-- Extensible Content -->
<!ELEMENT Object (#PCDATA|Signature|SignatureProperties|Manifest %Object.ANY;)* >
<!ATTLIST Object
Id ID #IMPLIED
MimeType CDATA #IMPLIED
Encoding CDATA #IMPLIED >
<!ELEMENT Manifest (Reference+) >
<!ATTLIST Manifest
Id ID #IMPLIED >
<!ELEMENT SignatureProperties (SignatureProperty+) >
<!ATTLIST SignatureProperties
Id ID #IMPLIED >
<!ELEMENT SignatureProperty (#PCDATA %SignatureProperty.ANY;)* >
<!ATTLIST SignatureProperty
Target CDATA #REQUIRED
Id ID #IMPLIED >
<!-- Algorithm Parameters -->
<!ELEMENT HMACOutputLength (#PCDATA) >
<!ELEMENT DSAKeyValue ((P, Q)?, G?, Y, J?, (Seed, PgenCounter)?) >
<!ELEMENT P (#PCDATA) >
<!ELEMENT Q (#PCDATA) >
<!ELEMENT G (#PCDATA) >
<!ELEMENT Y (#PCDATA) >
<!ELEMENT J (#PCDATA) >
<!ELEMENT Seed (#PCDATA) >
<!ELEMENT PgenCounter (#PCDATA) >
<!ELEMENT RSAKeyValue (Modulus, Exponent) >
<!ELEMENT Modulus (#PCDATA) >
<!ELEMENT Exponent (#PCDATA) >
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2005/9/15 20:02:00
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共享签名模型的DTD(官方的)
