progress on clean up file/paragraph

src/file/paragraph/run/break.ts

@@ -1,6 +1,30 @@
 // http://officeopenxml.com/WPtextSpecialContent-break.php
 import { XmlComponent } from "file/xml-components";
 
+// <xsd:group name="EG_RunInnerContent">
+//   ...
+//   <xsd:element name="br" type="CT_Br"/>
+
+// <xsd:complexType name="CT_Br">
+//     <xsd:attribute name="type" type="ST_BrType" use="optional"/>
+//     <xsd:attribute name="clear" type="ST_BrClear" use="optional"/>
+// </xsd:complexType>
+
+// <xsd:simpleType name="ST_BrType">
+// <xsd:restriction base="xsd:string">
+//   <xsd:enumeration value="page"/>
+//   <xsd:enumeration value="column"/>
+//   <xsd:enumeration value="textWrapping"/>
+// </xsd:restriction>
+// </xsd:simpleType>
+// <xsd:simpleType name="ST_BrClear">
+// <xsd:restriction base="xsd:string">
+//   <xsd:enumeration value="none"/>
+//   <xsd:enumeration value="left"/>
+//   <xsd:enumeration value="right"/>
+//   <xsd:enumeration value="all"/>
+// </xsd:restriction>
+// </xsd:simpleType>
 export class Break extends XmlComponent {
     constructor() {
         super("w:br");