XML XSD for the definition of additional metadata that describes a sc…

…hema.

src/schemaspy.meta.xsd

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+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+	<xs:element name="schemaMeta">
+		<xs:complexType>
+			<xs:sequence>
+				<xs:element ref="comments"/>
+				<xs:element ref="tables"/>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="comments" type="xs:string"/>
+	<xs:element name="tables">
+		<xs:complexType>
+			<xs:sequence>
+				<xs:element ref="table" minOccurs="0" maxOccurs="unbounded"/>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="table">
+        <xs:complexType>
+			<xs:sequence>
+				<xs:element ref="column" minOccurs="0" maxOccurs="unbounded"/>
+			</xs:sequence>
+			<xs:attribute name="name" type="xs:string" use="required"/>
+			<xs:attribute name="comments" type="xs:string"/>
+			<xs:attribute name="remoteSchema" type="xs:string">
+			    <xs:annotation>
+			        <xs:documentation>
+			            Specifies that this table exists in another schema.
+			        </xs:documentation>
+			    </xs:annotation>
+            </xs:attribute>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="column">
+		<xs:complexType>
+			<xs:sequence minOccurs="0">
+				<xs:element ref="foreignKey"/>
+			</xs:sequence>
+			<xs:attribute name="name" type="xs:string" use="required"/>
+			<xs:attribute name="comments" type="xs:string"/>
+			<xs:attribute name="primaryKey" type="xs:boolean">
+			    <xs:annotation>
+			        <xs:documentation>
+			            Specifies that this column is a primary key of
+			            its table. Defaults to false.
+			        </xs:documentation>
+			    </xs:annotation>
+            </xs:attribute>
+			<xs:attribute name="disableImpliedKeys">
+                <xs:annotation>
+                    <xs:documentation>
+                        Explicitly disables relationships to or from
+                        this column that may be implied by the column's
+                        name, type and size.
+                    </xs:documentation>
+                </xs:annotation>
+                <xs:simpleType>
+					<xs:restriction base="xs:string">
+						<xs:enumeration value="from"/>
+						<xs:enumeration value="to"/>
+						<xs:enumeration value="all"/>
+					</xs:restriction>
+				</xs:simpleType>
+			</xs:attribute>
+            <xs:attribute name="disableDiagramAssociations" type="xs:boolean">
+                <xs:annotation>
+                    <xs:documentation>
+                        Sometimes the associations displayed on a relationships
+                        diagram cause the diagram to become much more cluttered
+                        than it needs to be.  Enable this setting to not show 
+                        the relationships between this column and other columns.
+                        This only impacts diagrams. 
+                        Defaults to false. 
+                    </xs:documentation>
+                </xs:annotation>
+            </xs:attribute>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="foreignKey">
+        <xs:annotation>
+            <xs:documentation>
+                Associates this column with the primary key of another
+                table.
+            </xs:documentation>
+        </xs:annotation>
+        <xs:complexType>
+			<xs:attribute name="remoteSchema" type="xs:string">
+			    <xs:annotation>
+			        <xs:documentation>
+			            Specifies that the referenced table exists in
+			            another schema.
+			        </xs:documentation>
+			    </xs:annotation></xs:attribute>
+			<xs:attribute name="table" type="xs:string" use="required"/>
+			<xs:attribute name="column" type="xs:string" use="required"/>
+		</xs:complexType>
+	</xs:element>
+</xs:schema>