diff --git a/img/schema-1.svg b/img/schema-1.svg
new file mode 100644
index 0000000..95015f8
--- /dev/null
+++ b/img/schema-1.svg
@@ -0,0 +1,116 @@
+
+
diff --git a/img/schema-2.svg b/img/schema-2.svg
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@@ -0,0 +1,123 @@
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diff --git a/img/schema-3.svg b/img/schema-3.svg
new file mode 100644
index 0000000..2e2f8f5
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+++ b/img/schema-3.svg
@@ -0,0 +1,193 @@
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diff --git a/img/schema.svg b/img/schema.svg
new file mode 100644
index 0000000..c045e68
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+++ b/img/schema.svg
@@ -0,0 +1,343 @@
+
+