fo:marker和fo:retrieve-marker的解释和Parent Child Relation关系

Question

我是 XSLT 的新手，下面是代码快照，我试图从中了解 FOP 引擎将根据要决定的页面区域解释什么；谁是父母，谁将是孩子；以及任何其他相关信息将对您有所帮助：

<fo:layout-master-set>
                 <fo:simple-page-master master-name="second-page" page-width="210mm" page-height="297mm" margin-top="10mm" margin-bottom="10.5mm" margin-left="18mm" margin-right="18mm">
                     <fo:region-body margin-top="10mm" margin-bottom="75mm"/>
                     <fo:region-before extent="3mm" region-name="second-page-header"/>
                     <fo:region-after extent="75mm" region-name="second-page-footer"/>
                 </fo:simple-page-master>
                
                 <fo:page-sequence-master master-name="pageOneSequence">
                     <fo:single-page-master-reference master-reference="second-page"/>
                 </fo:page-sequence-master>
             </fo:layout-master-set>
             
             
        <fo:page-sequence master-reference="pageOneSequence">    
             
            <fo:static-content flow-name="second-page-footer" font-family="normal" font-style="normal" font-size="4">
                <fo:retrieve-marker retrieve-class-name="continued" retrieve-position="last-starting-within-page" retrieve-boundary="page"/>
                <fo:block-container position="absolute"  top="20mm">
                        <fo:block/>
                </fo:block-container>
            </fo:static-content>
        
        
          <fo:static-content flow-name="second-page-header" font-family="normal" font-style="normal" font-weight="normal">
            <xsl:if test="$Test = 0">
                <xsl:call-template name="Test"/>
            </xsl:if>
          </fo:static-content>
          <fo:flow flow-name="xsl-region-body" font-size="8pt" font-family="normal" font-style="normal" font-weight="normal">
             <fo:marker marker-class-name="continued">
                <fo:block/>
             </fo:marker>
       </fo:page-sequence>

所以如果能通俗易懂的解释就好了；这个 XSLT 代码的结果是什么；如果我们有任何语法错误，请随时提及。