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+<?xml version="1.0"?>
+
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+
+<xsd:annotation>
+ <xsd:documentation xml:lang="en">
+ <p>This schema covers (basic presentational) Chemical
+ markup. We will extend this schema with names and
+ predefined components.</p>
+ <p>author: Hans Hagen, copyright: PRAGMA-ADE / Hasselt NL</p>
+ </xsd:documentation>
+</xsd:annotation>
+
+<xsd:element type="chemType">
+ <xsd:sequence>
+ <xsd:element ref="chemicalComponentType" />
+ <xsd:choice>
+ <xsd:element ref="chemicalActionType" />
+ <xsd:element ref="chemicalBondType" />
+ </xsd:choice>
+ </xsd:sequence>
+</xsd:element>
+
+<xsd:element name="chem" type="chemType" />
+<xsd:element name="ichem" type="chemType" />
+<xsd:element name="dchem" type="chemType" />
+
+<xsd:element name="molecule">
+ <xsd:complexType>
+ <xsd:sequence>
+ <xsd:choice>
+ <xsd:element name="ion" />
+ <xsd:element name="atom" />
+ </xsd:choice>
+ <xsd:element name="caption" type="chemicalCaptionType" />
+ </xsd:sequence>
+ <xsd:attribute name="n" type="xsd:positiveInteger" />
+ </xsd:complexType>
+</xsd:element>
+
+<xsd:element name="ion">
+ <xsd:complexType>
+ <xsd:sequence>
+ <xsd:element name="atom" />
+ </xsd:sequence>
+ <xsd:attribute name="n" type="xsd:positiveInteger" />
+ <xsd:attribute name="charge" type="xsd:integer" />
+ </xsd:complexType>
+</xsd:element>
+
+<xsd:element name="atom" type="xsd:string">
+ <xsd:complexType>
+ <xsd:attribute name="n" type="xsd:positiveInteger"/>
+ <xsd:attribute name="charge" type="xsd:integer" />
+ <xsd:attribute name="protons" type="xsd:positiveInteger" />
+ <xsd:attribute name="weight" type="xsd:positiveInteger" />
+ </xsd:complexType>
+</xsd:element>
+
+<xsd:complexType name="chemicalActionType">
+ <xsd:choice>
+ <xsd:element name="plus" type="chemicalCaptionType" />
+ <xsd:element name="minus" type="chemicalCaptionType" />
+ <xsd:element name="equal" type="chemicalCaptionType" />
+ <xsd:element name="gives" type="chemicalCaptionType" />
+ <xsd:element name="equilibrium" type="chemicalCaptionType" />
+ <xsd:element name="mesomeric" type="chemicalCaptionType" />
+ </xsd:choice>
+</xsd:complexType>
+
+<xsd:complexType name="chemicalBondType">
+ <xsd:choice>
+ <xsd:element name="singlebond" />
+ <xsd:element name="doublebond" />
+ <xsd:element name="triplebond" />
+ </xsd:choice>
+</xsd:complexType>
+
+<xsd:complexType name="chemicalComponentType">
+ <xsd:choice>
+ <xsd:element ref="molecule" />
+ <xsd:element ref="ion" />
+ <xsd:element ref="atom" />
+ </xsd:choice>
+</xsd:complexType>
+
+<xsd:complexType name="chemicalCaptionType" minOccurs="0" maxOccurs="2">
+ <xsd:sequence>
+ <xsd:element name="caption" type="xsd:string" minOccurs="0" maxOccurs="2" />
+ </xsd:sequence>
+</xsd:complexType>
+
+</xsd:schema>