<!-- front matter -->
<!ELEMENT title (%inline;)*>
<!ELEMENT author (%inline;)*>
<!ELEMENT date (#PCDATA)>
<!-- structuring -->
<!ELEMENT section (stitle,(%chunk;|subsection)*)>
<!ATTLIST section
class CDATA #IMPLIED
id ID #IMPLIED>
<!ELEMENT subsection (stitle,(%chunk;|paragraph)*)>
<!ATTLIST subsection
class CDATA #IMPLIED
id ID #IMPLIED>
<!ELEMENT paragraph (stitle,(%chunk;|subparagraph)*)>
<!ATTLIST paragraph
class CDATA #IMPLIED
id ID #IMPLIED>
<!ELEMENT subparagraph (stitle,(%chunk;)*)>
<!ATTLIST subparagraph
class CDATA #IMPLIED
id ID #IMPLIED>
<!ELEMENT stitle (%inline;)*>
<!-- maths. must reduce to <math> elements for MathML -->
<!ELEMENT equation (math)*>
<!ATTLIST equation
id ID #IMPLIED>
<!ELEMENT displaymath (math)*>
<!ELEMENT inlinemath (math)*>
<!ELEMENT subeqn (math)*>
<!ATTLIST subeqn
id ID #IMPLIED>
<!ELEMENT eqnarray (subeqn)*>
<!ATTLIST eqnarray
number (yes|no) "yes"
id ID #IMPLIED>
<!-- sub DTDs and entities -->
<!--Added Math Symbols: Arrows-->
<!ENTITY % isoamsae.dtd SYSTEM "isoamsae.dtd">
<!--Added Math Symbols: Binary Operators-->
<!ENTITY % isoamsbe.dtd SYSTEM "isoamsbe.dtd">
<!--Added Math Symbols: Delimiters-->
<!ENTITY % isoamsce.dtd SYSTEM "isoamsce.dtd">
<!--Added Math Symbols: Negated Relations-->
<!ENTITY % isoamsne.dtd SYSTEM "isoamsne.dtd">
<!--Added Math Symbols: Ordinary-->
<!ENTITY % isoamsoe.dtd SYSTEM "isoamsoe.dtd">
<!--Added Math Symbols: Relations-->
<!ENTITY % isoamsre.dtd SYSTEM "isoamsre.dtd">
<!--General Technical-->
<!ENTITY % isoteche.dtd SYSTEM "isoteche.dtd">
<!--Numbers and Currency symbols-->
<!ENTITY % isonume.dtd SYSTEM "isonume.dtd">
<!--MathML Aliases (From ISO PUB,DIA,NUM)-->
<!ENTITY % mmaliase.dtd SYSTEM "mmaliase.dtd">
<!--Greek Symbols-->
<!ENTITY % isogrk3e.dtd SYSTEM "isogrk3e.dtd">
<!--Math Script Font-->
<!ENTITY % isomscre.dtd SYSTEM "isomscre.dtd">
<!--Math Open Face Font-->
<!ENTITY % isomopfe.dtd SYSTEM "isomopfe.dtd">
<!--MathML Entities-->
<!ENTITY % mmlent.dtd SYSTEM "mmlent.dtd">
<!--Main MathML DTD -->
<!ENTITY % mathml.dtd SYSTEM "mathml.dtd">