diff --git a/tools/extensions/extra-arith.txt b/tools/extensions/extra-arith.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5c6c760defc01a648ebcd099e08d665769a5c334
--- /dev/null
+++ b/tools/extensions/extra-arith.txt
@@ -0,0 +1,56 @@
+Differences between xpath-1.0-core-full.rnc and xpath-1.0-core-extra.rnc
+    docbook-full.xml: 239
+    existdb-full.xml: 19
+    histei-full.xml: 8
+    htmlbook-full.xml: 14
+    marklogic-full.xml: 4
+    xqjson-full.xml: 0
+Total: 284
+Differences between xpath-2.0-core-join.rnc and xpath-2.0-core-extra.rnc
+    docbook-full.xml: 239
+    existdb-full.xml: 19
+    histei-full.xml: 8
+    htmlbook-full.xml: 14
+    marklogic-full.xml: 6
+    xqjson-full.xml: 0
+Total: 286
+Differences between xpath-1.0-downward-last.rnc and xpath-1.0-downward-extra.rnc
+    docbook-full.xml: 22
+    existdb-full.xml: 1
+    histei-full.xml: 0
+    htmlbook-full.xml: 1
+    marklogic-full.xml: 0
+    xqjson-full.xml: 0
+Total: 24
+Differences between xpath-1.0-forward-last.rnc and xpath-1.0-forward-extra.rnc
+    docbook-full.xml: 22
+    existdb-full.xml: 1
+    histei-full.xml: 0
+    htmlbook-full.xml: 2
+    marklogic-full.xml: 0
+    xqjson-full.xml: 0
+Total: 25
+Differences between xpath-1.0-vertical-full.rnc and xpath-1.0-vertical-extra.rnc
+    docbook-full.xml: 224
+    existdb-full.xml: 21
+    histei-full.xml: 8
+    htmlbook-full.xml: 12
+    marklogic-full.xml: 4
+    xqjson-full.xml: 0
+Total: 269
+Differences between xpath-emso2-full.rnc and xpath-emso2-extra.rnc
+    docbook-full.xml: 235
+    existdb-full.xml: 19
+    histei-full.xml: 8
+    htmlbook-full.xml: 13
+    marklogic-full.xml: 4
+    xqjson-full.xml: 0
+Total: 279
+Differences between xpath-non-mixing-basic.rnc and xpath-non-mixing-extra.rnc
+    docbook-full.xml: 189
+    existdb-full.xml: 15
+    histei-full.xml: 8
+    htmlbook-full.xml: 2
+    marklogic-full.xml: 4
+    xqjson-full.xml: 0
+Total: 218
diff --git a/tools/extensions/extra-full.txt b/tools/extensions/extra-full.txt
new file mode 100644
index 0000000000000000000000000000000000000000..39ff84677a7eda516e0dbcde3ac7243e0d3653e9
--- /dev/null
+++ b/tools/extensions/extra-full.txt
@@ -0,0 +1,56 @@
+Differences between xpath-1.0-core-full.rnc and xpath-1.0-core-extra.rnc
+    docbook-full.xml: 1010
+    existdb-full.xml: 56
+    histei-full.xml: 35
+    htmlbook-full.xml: 175
+    marklogic-full.xml: 18
+    xqjson-full.xml: 1
+Total: 1295
+Differences between xpath-2.0-core-join.rnc and xpath-2.0-core-extra.rnc
+    docbook-full.xml: 1010
+    existdb-full.xml: 57
+    histei-full.xml: 36
+    htmlbook-full.xml: 176
+    marklogic-full.xml: 20
+    xqjson-full.xml: 2
+Total: 1301
+Differences between xpath-1.0-downward-last.rnc and xpath-1.0-downward-extra.rnc
+    docbook-full.xml: 127
+    existdb-full.xml: 12
+    histei-full.xml: 0
+    htmlbook-full.xml: 31
+    marklogic-full.xml: 0
+    xqjson-full.xml: 0
+Total: 170
+Differences between xpath-1.0-forward-last.rnc and xpath-1.0-forward-extra.rnc
+    docbook-full.xml: 127
+    existdb-full.xml: 12
+    histei-full.xml: 0
+    htmlbook-full.xml: 32
+    marklogic-full.xml: 0
+    xqjson-full.xml: 0
+Total: 171
+Differences between xpath-1.0-vertical-full.rnc and xpath-1.0-vertical-extra.rnc
+    docbook-full.xml: 992
+    existdb-full.xml: 59
+    histei-full.xml: 35
+    htmlbook-full.xml: 173
+    marklogic-full.xml: 17
+    xqjson-full.xml: 1
+Total: 1277
+Differences between xpath-emso2-full.rnc and xpath-emso2-extra.rnc
+    docbook-full.xml: 1000
+    existdb-full.xml: 56
+    histei-full.xml: 34
+    htmlbook-full.xml: 171
+    marklogic-full.xml: 18
+    xqjson-full.xml: 1
+Total: 1280
+Differences between xpath-non-mixing-basic.rnc and xpath-non-mixing-extra.rnc
+    docbook-full.xml: 898
+    existdb-full.xml: 50
+    histei-full.xml: 32
+    htmlbook-full.xml: 160
+    marklogic-full.xml: 18
+    xqjson-full.xml: 2
+Total: 1160
diff --git a/tools/extensions/extra-string.txt b/tools/extensions/extra-string.txt
new file mode 100644
index 0000000000000000000000000000000000000000..19da2bc1414da7d128ba9a1b9748074fae04fe62
--- /dev/null
+++ b/tools/extensions/extra-string.txt
@@ -0,0 +1,56 @@
+Differences between xpath-1.0-core-full.rnc and xpath-1.0-core-extra.rnc
+    docbook-full.xml: 739
+    existdb-full.xml: 34
+    histei-full.xml: 25
+    htmlbook-full.xml: 155
+    marklogic-full.xml: 8
+    xqjson-full.xml: 1
+Total: 962
+Differences between xpath-2.0-core-join.rnc and xpath-2.0-core-extra.rnc
+    docbook-full.xml: 739
+    existdb-full.xml: 35
+    histei-full.xml: 26
+    htmlbook-full.xml: 156
+    marklogic-full.xml: 8
+    xqjson-full.xml: 2
+Total: 966
+Differences between xpath-1.0-downward-last.rnc and xpath-1.0-downward-extra.rnc
+    docbook-full.xml: 103
+    existdb-full.xml: 10
+    histei-full.xml: 0
+    htmlbook-full.xml: 30
+    marklogic-full.xml: 0
+    xqjson-full.xml: 0
+Total: 143
+Differences between xpath-1.0-forward-last.rnc and xpath-1.0-forward-extra.rnc
+    docbook-full.xml: 103
+    existdb-full.xml: 10
+    histei-full.xml: 0
+    htmlbook-full.xml: 30
+    marklogic-full.xml: 0
+    xqjson-full.xml: 0
+Total: 143
+Differences between xpath-1.0-vertical-full.rnc and xpath-1.0-vertical-extra.rnc
+    docbook-full.xml: 736
+    existdb-full.xml: 35
+    histei-full.xml: 25
+    htmlbook-full.xml: 155
+    marklogic-full.xml: 8
+    xqjson-full.xml: 1
+Total: 960
+Differences between xpath-emso2-full.rnc and xpath-emso2-extra.rnc
+    docbook-full.xml: 736
+    existdb-full.xml: 34
+    histei-full.xml: 24
+    htmlbook-full.xml: 155
+    marklogic-full.xml: 8
+    xqjson-full.xml: 1
+Total: 958
+Differences between xpath-non-mixing-basic.rnc and xpath-non-mixing-extra.rnc
+    docbook-full.xml: 687
+    existdb-full.xml: 33
+    histei-full.xml: 22
+    htmlbook-full.xml: 155
+    marklogic-full.xml: 8
+    xqjson-full.xml: 2
+Total: 907