Account for image references in XSLT

Author: jrlegrand

airflow/dags/dailymed/template.xsl

@@ -74,34 +74,40 @@
 <!-- PackageLabels -->
 <xsl:template match="//v3:section[v3:code[@code='51945-4']]">
     <PackageLabel> <!-- there can be multiple PRINCIPAL DISPLAY PANEL sections in a SPL -->
-        <MediaList> <!-- there can be multiple images within a PRINCIPAL DISPLAY PANEL section -->
-            <xsl:for-each select=".//v3:observationMedia">
-                <Media>
-                    <ID>
-                        <xsl:value-of select="./@ID"/>
-                    </ID>
-                    <Image>
-                        <xsl:value-of select="v3:value/v3:reference/@value"/>
-                    </Image>
-                </Media>
-            </xsl:for-each>
-
-            <!-- then, handle renderMultiMedia tags by resolving their referenced observationMedia -->
-            <xsl:for-each select=".//v3:renderMultiMedia">
-                <xsl:variable name="refID" select="@referencedObject"/>
-                
-                <!-- look for the corresponding observationMedia with the same ID -->
-                <xsl:for-each select="//v3:observationMedia[@ID=$refID]">
-                    <Media>
-                        <ID>
-                            <xsl:value-of select="./@ID"/>
-                        </ID>
-                        <Image>
-                            <xsl:value-of select="v3:value/v3:reference/@value"/>
-                        </Image>
-                    </Media>
-                </xsl:for-each>
-            </xsl:for-each>
+        <MediaList>
+            <!-- If v3:observationMedia exists, process only those -->
+            <xsl:choose>
+                <xsl:when test=".//v3:observationMedia">
+                    <xsl:for-each select=".//v3:observationMedia">
+                        <Media>
+                            <ID>
+                                <xsl:value-of select="./@ID"/>
+                            </ID>
+                            <Image>
+                                <xsl:value-of select="v3:value/v3:reference/@value"/>
+                            </Image>
+                        </Media>
+                    </xsl:for-each>
+                </xsl:when>
+                <!-- Else, process v3:renderMultiMedia -->
+                <xsl:otherwise>
+                    <xsl:for-each select=".//v3:renderMultiMedia">
+                        <xsl:variable name="refID" select="@referencedObject"/>
+                        
+                        <!-- look for the corresponding observationMedia with the same ID -->
+                        <xsl:for-each select="//v3:observationMedia[@ID=$refID]">
+                            <Media>
+                                <ID>
+                                    <xsl:value-of select="./@ID"/>
+                                </ID>
+                                <Image>
+                                    <xsl:value-of select="v3:value/v3:reference/@value"/>
+                                </Image>
+                            </Media>
+                        </xsl:for-each>
+                    </xsl:for-each>
+                </xsl:otherwise>
+            </xsl:choose>
         </MediaList>
         <ID><xsl:value-of select=".//@root"/></ID>
         <Text><xsl:value-of select="."/></Text>