diff --git a/schema/def/sampleFragmentSchema.xml b/schema/def/sampleFragmentSchema.xml
new file mode 100644
index 0000000..316f275
--- /dev/null
+++ b/schema/def/sampleFragmentSchema.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<pagis-fragment id="organization-employee" xmlns="http://pagi.org/schema">
+    <nodeType name="organization">
+        <!-- required attributes -->
+        <stringProperty name="name" minArity="1" maxArity="1"/>
+
+        <stringProperty name="website" />
+        <integerProperty name="num_employees" minRange="1" maxArity="1"/>
+
+        <edgeType name="org_parent" targetNodeType="organization" maxArity="1" />
+        <edgeType name="org_child" targetNodeType="organization"/>
+    </nodeType>
+
+    <nodeType name="employee">
+        <!-- required attributes -->
+        <stringProperty name="name" minArity="1" maxArity="1"/>
+        <stringProperty name="ssn" minArity="1" maxArity="1"/>                           <!-- social security number -->
+        <stringProperty name="title" />
+        <stringProperty name="ethnicity" />
+        <stringProperty name="birth_date" maxArity="1"/>
+        <stringProperty name="email" />
+        <stringProperty name="phone" />
+        <enumProperty name="gender" maxArity="1">
+            <item name="M"/>
+            <item name="F"/>
+        </enumProperty>
+
+        <edgeType name="employed_by" targetNodeType="organization">
+            <stringProperty name="dur_start" maxArity="1" minArity="0"/>
+            <stringProperty name="dur_end" maxArity="1" minArity="0"/>
+        </edgeType>
+    </nodeType>
+</pagis-fragment>
\ No newline at end of file
diff --git a/stream/diff-xml/sampleDiff.xml b/stream/diff-xml/sampleDiff.xml
new file mode 100644
index 0000000..c819529
--- /dev/null
+++ b/stream/diff-xml/sampleDiff.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<graphDiff xmlns="http://pagi.org/stream" sourceId="sourceDoc" targetId="targetDoc">
+    <sourceTargetNode nodeType="COREF" sourceId="1" targetId="2"/>
+
+    <nodeRemove type="TOK" id="11:11">
+        <intProp v="6" k="length"></intProp>
+        <intProp v="11" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+    </nodeRemove>
+
+    <node type="TOK" id="11:6">
+        <intProp v="6" k="length"></intProp>
+        <intProp v="11" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+        <edge to="18:4" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="18:4">
+        <intProp v="4" k="length"></intProp>
+        <intProp v="18" k="start"></intProp>
+        <strProp v="NNP" k="pos"></strProp>
+    </node>
+
+    <nodeUpdate type="TOK" id="9:1">
+        <strPropRemove k="pos" v="NN"/>
+        <edgeRemove to="11:11" toType="TOK" type="next"/>
+        <edge to="11:6" toType="TOK" type="next"></edge>
+    </nodeUpdate>
+
+    <nodeUpdate type="COREF" id="1">
+        <strPropRemove k="name" v="mary"/>
+        <strProp k="name" v="MaryLamb"/>
+    </nodeUpdate>
+</graphDiff>
\ No newline at end of file
diff --git a/stream/diff-xml/sourceDoc.xml b/stream/diff-xml/sourceDoc.xml
new file mode 100644
index 0000000..6b3f387
--- /dev/null
+++ b/stream/diff-xml/sourceDoc.xml
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document xmlns="http://pagi.org/stream" id="sourceDoc">
+    <schema uri="http://pagi.org/testSuite/extTokFull"></schema>
+    <asSpan nodeType="TOK"/>
+    <asSequence nodeType="TOK"/>
+    <asSequence nodeType="SB"/>
+    <asSpanContainer spanType="TOK" nodeType="SB"/>
+
+    <content contentType="text/plain">Mary had a little-lamb</content>
+
+    <node type="TOK" id="0:4">
+        <intProp v="4" k="length"></intProp>
+        <intProp v="0" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+        <edge to="5:3" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="5:3">
+        <intProp v="3" k="length"></intProp>
+        <intProp v="5" k="start"></intProp>
+        <strProp v="VB" k="pos"></strProp>
+        <edge to="9:1" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="9:1">
+        <intProp v="1" k="length"></intProp>
+        <intProp v="9" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+        <edge to="11:11" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="11:11">
+        <intProp v="6" k="length"></intProp>
+        <intProp v="11" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+    </node>
+
+    <node type="COREF" id="1">
+        <strProp v="mary" k="name"></strProp>
+        <edge type="member" toType="TOK" to="0:4"/>
+        <edge type="member" toType="TOK" to="11:11"/>
+    </node>
+</document>
\ No newline at end of file
diff --git a/stream/diff-xml/targetDoc.xml b/stream/diff-xml/targetDoc.xml
new file mode 100644
index 0000000..8514dbd
--- /dev/null
+++ b/stream/diff-xml/targetDoc.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document xmlns="http://pagi.org/stream" id="targetDoc">
+    <schema uri="http://pagi.org/testSuite/extTokFull"></schema>
+    <asSpan nodeType="TOK"/>
+    <asSequence nodeType="TOK"/>
+    <asSequence nodeType="SB"/>
+    <asSpanContainer spanType="TOK" nodeType="SB"/>
+
+    <content contentType="text/plain">Mary had a little-lamb</content>
+
+    <node type="TOK" id="0:4">
+        <intProp v="4" k="length"></intProp>
+        <intProp v="0" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+        <edge to="5:3" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="5:3">
+        <intProp v="3" k="length"></intProp>
+        <intProp v="5" k="start"></intProp>
+        <strProp v="VB" k="pos"></strProp>
+        <edge to="9:1" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="9:1">
+        <intProp v="1" k="length"></intProp>
+        <intProp v="9" k="start"></intProp>
+        <edge to="11:6" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="11:6">
+        <intProp v="6" k="length"></intProp>
+        <intProp v="11" k="start"></intProp>
+        <strProp v="NN" k="pos"></strProp>
+        <edge to="18:4" toType="TOK" type="next"></edge>
+    </node>
+
+    <node type="TOK" id="18:4">
+        <intProp v="4" k="length"></intProp>
+        <intProp v="18" k="start"></intProp>
+        <strProp v="NNP" k="pos"></strProp>
+    </node>
+
+    <node type="COREF" id="2">
+        <strProp v="MaryLamb" k="name"></strProp>
+        <edge type="member" toType="TOK" to="0:4"/>
+        <edge type="member" toType="TOK" to="11:11"/>
+    </node>
+
+</document>
\ No newline at end of file
diff --git a/stream/fragment-xml/sampleFragment.xml b/stream/fragment-xml/sampleFragment.xml
new file mode 100644
index 0000000..2858a81
--- /dev/null
+++ b/stream/fragment-xml/sampleFragment.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<graphFragment xmlns="http://pagi.org/stream" sourceGraph="company-org" fragmentIdentifier="IT">
+    <schema uri="organization-employee"/>
+
+    <node type="organization" id="my-company">
+        <strProp k="name" v="My Company"/>
+        <strProp k="num_employees" v="2"/>
+    </node>
+
+    <node type="employee" id="1231233333">
+        <strProp k="name" v="Jane Doe"/>
+
+        <strProp k="ssn" v="1231233333"/>
+        <strProp k="title" v="Director of IT"/>
+        <strProp k="ethnicity" v="Hispanic"/>
+        <strProp k="gender" v="M"/>
+
+        <edge type="employed_by" toType="organization" to="my-company">
+            <strProp k="dur_start" v="2012-01-01"/>
+        </edge>
+    </node>
+    <node type="employee" id="3213211111">
+        <strProp k="name" v="John Smith"/>
+
+        <strProp k="ssn" v="3213211111"/>
+        <strProp k="title" v="Network Administrator"/>
+        <strProp k="ethnicity" v="White"/>
+        <strProp k="gender" v="M"/>
+
+        <edge type="employed_by" toType="organization" to="my-company">
+            <strProp k="dur_start" v="2005-01-01"/>
+        </edge>
+    </node>
+</graphFragment>
\ No newline at end of file