* Strict namespace setting can be a problem when upgrading existing database files, such as startup-db or persistent running-db, or any other saved XML file.

* For backward compatibility, load of startup and running set CLICON_XML_NS_STRICT to false temporarily.
* Added three-valued return values for several validate functions where -1 is fatal error, 0 is validation failed and 1 is validation OK.
  * This includes: `xmldb_put`, `xml_yang_validate_all`, `xml_yang_validate_add`, `xml_yang_validate_rpc`, `api_path2xml`, `api_path2xpath`
* Added new xml functions for specific types: `xml_child_nr_notype`, `xml_child_nr_notype`, `xml_child_i_type`, `xml_find_type`.

test/test_compat.sh

@@ -0,0 +1,116 @@
+#!/bin/bash
+# Test of backward compatibility
+# 1) Load <3.9 startup/running/extra files without namespaces - ensure it returns namespaces
+#
+
+APPNAME=example
+# include err() and new() functions and creates $dir
+. ./lib.sh
+cfg=$dir/conf_startup.xml
+
+cat <<EOF > $cfg
+<config>
+  <CLICON_CONFIGFILE>$cfg</CLICON_CONFIGFILE>
+  <CLICON_YANG_DIR>/usr/local/share/$APPNAME/yang</CLICON_YANG_DIR>
+  <CLICON_YANG_DIR>/usr/local/share/clixon</CLICON_YANG_DIR>
+  <CLICON_YANG_MODULE_MAIN>example</CLICON_YANG_MODULE_MAIN>
+  <CLICON_CLI_MODE>$APPNAME</CLICON_CLI_MODE>
+  <CLICON_BACKEND_DIR>/usr/local/lib/$APPNAME/backend</CLICON_BACKEND_DIR>
+  <CLICON_NETCONF_DIR>/usr/local/lib/$APPNAME/netconf</CLICON_NETCONF_DIR>
+  <CLICON_RESTCONF_DIR>/usr/local/lib/$APPNAME/restconf</CLICON_RESTCONF_DIR>
+  <CLICON_CLI_DIR>/usr/local/lib/$APPNAME/cli</CLICON_CLI_DIR>
+  <CLICON_CLISPEC_DIR>/usr/local/lib/$APPNAME/clispec</CLICON_CLISPEC_DIR>
+  <CLICON_SOCK>/usr/local/var/$APPNAME/$APPNAME.sock</CLICON_SOCK>
+  <CLICON_BACKEND_PIDFILE>/usr/local/var/$APPNAME/$APPNAME.pidfile</CLICON_BACKEND_PIDFILE>
+  <CLICON_CLI_GENMODEL_COMPLETION>1</CLICON_CLI_GENMODEL_COMPLETION>
+  <CLICON_XMLDB_DIR>/usr/local/var/$APPNAME</CLICON_XMLDB_DIR>
+  <CLICON_XMLDB_PLUGIN>/usr/local/lib/xmldb/text.so</CLICON_XMLDB_PLUGIN>
+  <CLICON_CLI_LINESCROLLING>0</CLICON_CLI_LINESCROLLING>
+  <CLICON_STARTUP_MODE>init</CLICON_STARTUP_MODE>
+  <CLICON_XML_SORT>true</CLICON_XML_SORT>
+</config>
+
+EOF
+
+
+run(){
+    mode=$1
+    expect=$2
+
+    dbdir=$dir/db
+    cat <<EOF > $dbdir
+<config>
+   <interfaces>
+      <interface>
+         <name>run</name>
+         <type>ex:eth</type>
+      </interface>
+    </interfaces>
+</config>
+EOF
+    sudo mv $dbdir /usr/local/var/$APPNAME/running_db
+
+    cat <<EOF > $dbdir
+<config>
+   <interfaces>
+      <interface>
+         <name>startup</name>
+         <type>ex:eth</type>
+      </interface>
+    </interfaces>
+</config>
+EOF
+    sudo mv $dbdir /usr/local/var/$APPNAME/startup_db
+
+    cat <<EOF > $dir/config
+<config>
+   <interfaces>
+      <interface>
+         <name>extra</name>
+         <type>ex:eth</type>
+      </interface>
+    </interfaces>
+</config>
+EOF
+
+    new "test params: -f $cfg -s $mode -c $dir/config"
+
+    if [ $BE -ne 0 ]; then
+	new "kill old backend"
+	sudo clixon_backend -zf $cfg
+	if [ $? -ne 0 ]; then
+ 	    err
+	fi
+    
+	new "start backend  -f $cfg -s $mode -c $dir/config"
+	sudo $clixon_backend -f $cfg -s $mode -c $dir/config
+	if [ $? -ne 0 ]; then
+	    err
+	fi
+    fi
+
+    new "Check $mode"
+    expecteof "$clixon_netconf -qf $cfg" 0 '<rpc><get-config><source><running/></source></get-config></rpc>]]>]]>' "^<rpc-reply>$expect</rpc-reply>]]>]]>$"
+
+    if [ $BE -eq 0 ]; then
+	exit # BE
+    fi
+
+    new "Kill backend"
+    # Check if premature kill
+    pid=`pgrep -u root -f clixon_backend`
+    if [ -z "$pid" ]; then
+	err "backend already dead"
+    fi
+    # kill backend
+    sudo clixon_backend -z -f $cfg
+    if [ $? -ne 0 ]; then
+	err "kill backend"
+    fi
+
+} # run 
+
+run running '<data><interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"><interface><name>extra</name><type>ex:eth</type><enabled>true</enabled></interface><interface><name>lo</name><type>ex:loopback</type><enabled>true</enabled></interface><interface><name>run</name><type>ex:eth</type><enabled>true</enabled></interface></interfaces></data>'
+run startup '<data><interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"><interface><name>extra</name><type>ex:eth</type><enabled>true</enabled></interface><interface><name>lo</name><type>ex:loopback</type><enabled>true</enabled></interface><interface><name>startup</name><type>ex:eth</type><enabled>true</enabled></interface></interfaces></data>'
+
+rm -rf $dir