规范化xml内容，并在xml中添加仿真设置，规范化版本号等内容，补充xml规范md文件

schemas/system-simulation-v1.xsd

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
+  <xs:simpleType name="NonEmptyString">
+    <xs:restriction base="xs:string">
+      <xs:minLength value="1"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="PositiveDouble">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:element name="System">
+    <xs:complexType>
+      <xs:sequence>
+        <xs:element name="Simulation">
+          <xs:complexType>
+            <xs:attribute name="tStart" type="xs:double" use="required"/>
+            <xs:attribute name="tStop" type="xs:double" use="required"/>
+            <xs:attribute name="step" type="PositiveDouble" use="required"/>
+            <xs:attribute name="maxStep" type="PositiveDouble" use="required"/>
+            <xs:attribute name="method" type="NonEmptyString" use="required"/>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="Components">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="Component" minOccurs="0" maxOccurs="unbounded">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="Port" minOccurs="0" maxOccurs="unbounded">
+                      <xs:complexType>
+                        <xs:attribute name="name" type="NonEmptyString" use="required"/>
+                      </xs:complexType>
+                    </xs:element>
+                    <xs:element name="Parameter" minOccurs="0" maxOccurs="unbounded">
+                      <xs:complexType>
+                        <xs:attribute name="name" type="NonEmptyString" use="required"/>
+                        <xs:attribute name="value" type="xs:double" use="required"/>
+                      </xs:complexType>
+                    </xs:element>
+                  </xs:sequence>
+                  <xs:attribute name="id" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="name" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="type" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="componentType" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="x" type="xs:double" use="required"/>
+                  <xs:attribute name="y" type="xs:double" use="required"/>
+                </xs:complexType>
+              </xs:element>
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="Connections">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="Connection" minOccurs="0" maxOccurs="unbounded">
+                <xs:complexType>
+                  <xs:attribute name="id" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="source" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="sourcePort" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="target" type="NonEmptyString" use="required"/>
+                  <xs:attribute name="targetPort" type="NonEmptyString" use="required"/>
+                </xs:complexType>
+              </xs:element>
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+      </xs:sequence>
+
+      <xs:attribute name="name" type="NonEmptyString" use="required"/>
+      <xs:attribute name="schemaVersion" use="required" fixed="1"/>
+      <xs:attribute name="unitSystem" use="required" fixed="SI"/>
+    </xs:complexType>
+  </xs:element>
+</xs:schema>