This is just a raw code dump not a step by step tutorial.

You can also download a ZIP file for importing it into OpenCms. But you have to adjust the paths manually.

Example JSP calls

<%@ page import="org.opencms.file.*,
                 org.opencms.jsp.*,
                 org.opencms.xml.*,
                 org.opencms.xml.content.*,
                 org.opencms.xml.types.*,
                 org.opencms.util.*,
                 java.util.*" %><%

// The resource to read
String resource = "/system/modules/de.himberger.sebastian.site/schemas/publication/manipulate.html";

// The locale to use
Locale locale = new Locale("en");

// The names of the elements
String versionElement = "Version";
String fileElement = "File";

CmsJspActionElement cmsa = new CmsJspActionElement(pageContext,request,response);
CmsObject cmso = cmsa.getCmsObject();

// read the resource
CmsResource xmlContentResource = cmso.readResource(resource);
CmsFile xmlContentFile = CmsFile.upgrade(xmlContentResource,cmso);

// Output current xml
out.println("<h1>Before</h1>");
out.println("<pre>" + CmsStringUtil.escapeHtml((new String(xmlContentFile.getContents()))) + "</pre>");

// build up the xml content instance
CmsXmlContent xmlContent = CmsXmlContentFactory.unmarshal(cmso,xmlContentFile);

// This is a new version (in this case it is a nested schema
I_CmsXmlContentValue addedVersionValue = xmlContent.addValue(cmso,versionElement ,locale,0);

// Add a new element to the created version (nested schema)
I_CmsXmlContentValue addedFileValueRaw = xmlContent.addValue(
  cmso,addedVersionValue.getPath() + "/" + fileElement,locale,0);
CmsXmlVfsFileValue addedFileValue = (CmsXmlVfsFileValue ) addedFileValueRaw;
addedFileValue.setStringValue(cmso,resource);

// manipulate an element
I_CmsXmlContentValue theSameValueWeAdded = xmlContent.getValue(
  addedVersionValue.getPath() + "/" + fileElement,locale);
// ... do the same as above

// add and remove a value
I_CmsXmlContentValue secondAddedVersionValue = xmlContent.addValue(cmso,
  versionElement,locale,addedVersionValue.getIndex()+1);

out.println("<h1>After adding</h1>");
out.println("<pre>" + CmsStringUtil.escapeHtml((new String(xmlContent.marshal()))) + "</pre>");

xmlContent.removeValue(secondAddedVersionValue.getPath(),locale,0);

out.println("<h1>After removing</h1>");
out.println("<pre>" + CmsStringUtil.escapeHtml((new String(xmlContent.marshal()))) + "</pre>");

// In the real world you would now do
// xmlContentFile.setContents(xmlContent.marshal());
// cmso.writeResource(xmlContentFile);
%>

Version schema

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

       <xsd:include schemaLocation="opencms://opencms-xmlcontent.xsd"/>
       <xsd:element name="XmlContentPublicationVersions"
                    type="OpenCmsXmlContentPublicationVersions"/>

       <xsd:complexType name="OpenCmsXmlContentPublicationVersions">
               <xsd:sequence>
                       <xsd:element name="XmlContentPublicationVersion"
                                    type="OpenCmsXmlContentPublicationVersion"
                                    minOccurs="0" maxOccurs="unbounded"/>
               </xsd:sequence>
       </xsd:complexType>

       <xsd:complexType name="OpenCmsXmlContentPublicationVersion">
              <xsd:sequence>
                      <xsd:element name="Title" type="OpenCmsString" />
		      <xsd:element name="PublicationDate" type="OpenCmsDateTime" />
                      <xsd:element name="Description" type="OpenCmsString" />
                      <xsd:element name="File" type="OpenCmsVfsFile" minOccurs="0"
                                   maxOccurs="10" />
              </xsd:sequence>
              <xsd:attribute name="language" type="OpenCmsLocale" use="optional"/>
       </xsd:complexType>

</xsd:schema>

Publication schema

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

       <xsd:include schemaLocation="opencms://opencms-xmlcontent.xsd"/>
       <xsd:include
            schemaLocation="opencms://system/modules/de.himberger.sebastian.site/schemas/publication/publication-version.xsd"/>

       <xsd:element name="XmlContentPublications" type="OpenCmsXmlContentPublications"/>

       <xsd:complexType name="OpenCmsXmlContentPublications">
               <xsd:sequence>
                       <xsd:element name="XmlContentPublication"
                                    type="OpenCmsXmlContentPublication"
                                    minOccurs="0" maxOccurs="unbounded"/>
               </xsd:sequence>
       </xsd:complexType>

       <xsd:complexType name="OpenCmsXmlContentPublication">
              <xsd:sequence>
                      <xsd:element name="Title" type="OpenCmsString" />
                      <xsd:element name="Subtitle" type="OpenCmsString" />
                      <xsd:element name="Description" type="OpenCmsHtml" />
                      <xsd:element name="Version"
                                   type="OpenCmsXmlContentPublicationVersion"
                                   minOccurs="0" maxOccurs="unbounded" />
              </xsd:sequence>
              <xsd:attribute name="language" type="OpenCmsLocale" use="required"/>
       </xsd:complexType>

</xsd:schema>