diff --git a/schemas.xml b/schemas.xml
new file mode 100644
index 000000000..9a881bb6f
--- /dev/null
+++ b/schemas.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<locatingRules xmlns="http://thaiopensource.com/ns/locating-rules/1.0">
+  <documentElement localName="geometry" uri="src/templates/geometry.rnc"/>
+  <documentElement localName="materials" uri="src/templates/materials.rnc"/>
+  <documentElement localName="settings" uri="src/templates/settings.rnc"/>
+  <documentElement localName="tallies" uri="src/templates/tallies.rnc"/>
+  <documentElement localName="plots" uri="src/templates/plots.rnc"/>
+  <documentElement localName="cross_sections" uri="src/templates/cross_sections.rnc"/>
+</locatingRules>
diff --git a/src/templates/cross_sections.rnc b/src/templates/cross_sections.rnc
new file mode 100644
index 000000000..e82bb986f
--- /dev/null
+++ b/src/templates/cross_sections.rnc
@@ -0,0 +1,23 @@
+element cross_sections {
+  element ace_table {
+    (element name { xsd:string { maxLength = "15" } } |
+      attribute name { xsd:string { maxLength = "15" } }) &
+    (element alias { xsd:string { maxLength = "15" } } |
+      attribute alias { xsd:string { maxLength = "15" } })? &
+    (element zaid { xsd:int } | attribute zaid { xsd:int }) &
+    (element metastable { xsd:int } | attribute metastable { xsd:int })? &
+    (element awr { xsd:double } | attribute awr { xsd:double }) &
+    (element temperature { xsd:double } | attribute temperature { xsd:double }) &
+    (element path { xsd:string { maxLength = "255" } } |
+      attribute path { xsd:string { maxLength = "255" } }) &
+    (element location { xsd:int } | attribute location { xsd:int })?
+  }* &
+
+  element directory { xsd:string { maxLength = "255" } }? &
+
+  element filetype { ( "ascii" | "binary" ) } &
+
+  element record_length { xsd:int }? &
+
+  element entries { xsd:int }?
+}
\ No newline at end of file
diff --git a/src/templates/geometry.rnc b/src/templates/geometry.rnc
new file mode 100644
index 000000000..04d07444a
--- /dev/null
+++ b/src/templates/geometry.rnc
@@ -0,0 +1,32 @@
+element geometry {
+  element cell {
+    (element id { xsd:int } | attribute id { xsd:int }) &
+    (element universe { xsd:int } | attribute universe { xsd:int })? &
+    (
+      (element fill { xsd:int } | attribute fill { xsd:int }) |
+      (element material { xsd:int } | attribute material { xsd:int })
+    ) &
+    (element surfaces { list { xsd:int+ } } | attribute surfaces { list { xsd:int+ } }) &
+    (element rotation { list { xsd:double+ } } | attribute rotation { list { xsd:double+ } })? &
+    (element translation { list { xsd:double+ } } | attribute translation { list { xsd:double+ } })?
+  }*
+
+  & element surface {
+    (element id { xsd:int } | attribute id { xsd:int }) &
+    (element type { xsd:string { maxLength = "15" } } | 
+     attribute type { xsd:string { maxLength = "15" } }) &
+    (element coeffs { list { xsd:double+ } } | attribute coeffs { list { xsd:double+ } }) &
+    (element boundary { ( "transmit" | "reflective" | "vacuum" ) } |
+     attribute boundary { ( "transmit" | "reflective" | "vacuum" ) })?
+  }*
+
+  & element lattice {
+    (element id { xsd:int } | attribute id { xsd:int }) &
+    (element type { ( "rectangular" | "hexagonal" ) } | 
+     attribute type { ( "rectangular" | "hexagonal" ) })? &
+    (element dimension { list { xsd:int+ } } | attribute dimension { list { xsd:int+ } }) &
+    (element lower_left { list { xsd:double+ } } | attribute lower_left { list { xsd:double+ } }) &
+    (element width { list { xsd:double+ } } | attribute width { list { xsd:double+ } }) &
+    (element universes { list { xsd:int+ } } | attribute universes { list { xsd:int+ } })
+  }*
+}
diff --git a/src/templates/materials.rnc b/src/templates/materials.rnc
new file mode 100644
index 000000000..196562af6
--- /dev/null
+++ b/src/templates/materials.rnc
@@ -0,0 +1,31 @@
+element materials {
+  element material {
+    (element id { xsd:int } | attribute id { xsd:int }) &
+
+    element density {
+      (element value { xsd:double } | attribute value { xsd:double })? &
+      (element units { xsd:string { maxLength = "10" } } |
+        attribute units { xsd:string { maxLength = "10" } })
+    } &
+
+    element nuclide {
+      (element name { xsd:string { maxLength = "7" } } | 
+        attribute name { xsd:string { maxLength = "7" } }) &
+      (element xs { xsd:string { maxLength = "3" } } |
+        attribute xs { xsd:string { maxLength = "3" } })? &
+      (
+        (element ao { xsd:double } | attribute ao { xsd:double }) |
+        (element wo { xsd:double } | attribute wo { xsd:double })
+      )
+    }*  &
+
+    element sab {
+      (element name { xsd:string { maxLength = "7" } } | 
+        attribute name { xsd:string { maxLength = "7" } }) &
+      (element xs { xsd:string { maxLength = "3" } } |
+        attribute xs { xsd:string { maxLength = "3" } })?
+    }*
+  }+ &
+
+  element default_xs { xsd:string { maxLength = "3" } }
+}
diff --git a/src/templates/plots.rnc b/src/templates/plots.rnc
new file mode 100644
index 000000000..3c29ba4e0
--- /dev/null
+++ b/src/templates/plots.rnc
@@ -0,0 +1,31 @@
+element plots {
+  element plot {
+    (element id { xsd:int } | attribute id { xsd:int })? &
+    (element filename { xsd:string { maxLength = "50" } } |
+      attribute filename { xsd:string { maxLength = "50" } })? &
+    (element type { "slice" } | attribute type { "slice" })? &
+    (element color { ( "cell" | "mat" | "material" ) } |
+      attribute color { ( "cell" | "mat" | "material" ) })? &
+    (element origin { list { xsd:double+ } } | 
+      attribute origin { list { xsd:double+ } })? &
+    (element width { list { xsd:double+ } } | 
+      attribute width { list { xsd:double+ } })? &
+    (element basis { ( "xy" | "yz" | "xz" ) } |
+      attribute basis { ( "xy" | "yz" | "xz" ) })? &
+    (element pixels { list { xsd:int+ } } | 
+      attribute pixels { list { xsd:int+ } })? &
+    (element background { list { xsd:int+ } } |
+      attribute background { list { xsd:int+ } })? &
+    element col_spec {
+      (element id { xsd:int } | attribute id { xsd:int }) &
+      (element rgb { list { xsd:int+ } } | 
+        attribute rgb { list { xsd:int+ } })
+    }* &
+    element mask {
+      (element components { list { xsd:int+ } } | 
+        attribute components { list { xsd:int+ } }) &
+      (element background { list { xsd:int+ } } | 
+        attribute background { list { xsd:int+ } })
+    }*
+  }*
+}
diff --git a/src/templates/settings.rnc b/src/templates/settings.rnc
new file mode 100644
index 000000000..207653f99
--- /dev/null
+++ b/src/templates/settings.rnc
@@ -0,0 +1,99 @@
+element settings {
+  element confidence_intervals { ( "on" | "off" ) }? &
+
+  (
+    element criticality {
+      (element batches { xsd:int } | attribute batches { xsd:int }) &
+      (element inactive { xsd:int } | attribute inactive { xsd:int }) &
+      (element particles { xsd:int } | attribute particles { xsd:int }) &
+      (element generations_per_batch { xsd:int } | attribute generations_per_batch { xsd:int })?
+    } |
+    element fixed_source {
+      (element batches { xsd:int } | attribute batches { xsd:int }) &
+      (element particles { xsd:int } | attribute particles { xsd:int })
+    }
+  ) &
+
+  element cross_sections { xsd:string { maxLength = "255" } }? &
+
+  element cutoff {
+    (element weight { xsd:double } | attribute weight { xsd:double })? &
+    (element weight_avg { xsd:double } | attribute weight_avg { xsd:double })?
+  }? &
+
+  element energy_grid { xsd:string { maxLength = "7" } }? &
+
+  element entropy {
+    (element dimension { list { xsd:int+ } } | 
+      attribute dimension { list { xsd:int+ } })? &
+    (element lower_left { list { xsd:double+ } } | 
+      attribute lower_left { list { xsd:double+ } }) &
+    (element upper_right { list { xsd:double+ } } | 
+      attribute upper_right { list { xsd:double+ } })
+  }? &
+
+  element no_reduce { ( "off" | "on" ) }? &
+
+  element output { list { 
+    ( "summary" | "cross_sections" | "tallies" )+ } }? &
+
+  element ptables { ( "off" | "on" ) }? &
+
+  element seed { xsd:integer }? &
+
+  element source {
+    element file { xsd:string { maxLength = "255" } }? &
+    element space {
+      (element type { xsd:string { maxLength = "10" } } |
+        attribute type { xsd:string { maxLength = "10" } }) &
+      (element length { xsd:int } | attribute length { xsd:int })? &
+      (element interpolation { xsd:string { maxLength = "10" } } |
+        attribute interplation { xsd:string { maxLength = "10" } })? &
+      (element parameters { list { xsd:double+ } } |
+        attribute parameters { list { xsd:double+ } })?
+    }? &
+    element angle {
+      (element type { xsd:string { maxLength = "10" } } |
+        attribute type { xsd:string { maxLength = "10" } }) &
+      (element length { xsd:int } | attribute length { xsd:int })? &
+      (element interpolation { xsd:string { maxLength = "10" } } |
+        attribute interplation { xsd:string { maxLength = "10" } })? &
+      (element parameters { list { xsd:double+ } } |
+        attribute parameters { list { xsd:double+ } })?
+    }? &
+    element energy {
+      (element type { xsd:string { maxLength = "10" } } |
+        attribute type { xsd:string { maxLength = "10" } }) &
+      (element length { xsd:int } | attribute length { xsd:int })? &
+      (element interpolation { xsd:string { maxLength = "10" } } |
+        attribute interplation { xsd:string { maxLength = "10" } })? &
+      (element parameters { list { xsd:double+ } } |
+        attribute parameters { list { xsd:double+ } })?
+    }?
+  }? &
+
+  element state_point {
+    (
+      (element batches { list { xsd:int } } |
+        attribute batches { list { xsd:int } }) |
+      (element interval { xsd:int} | attribute interval { xsd:int })
+    ) &
+    (element source_separate { ( "off" | "on" ) } | 
+      attribute source_separate { ( "off" | "on" ) })?
+  }? &
+
+  element survival_biasing { ( "off" | "on" ) }? &
+
+  element trace { list { xsd:int } }? &
+
+  element verbosity { xsd:int }? &
+
+  element uniform_fs{
+    (element dimension { list { xsd:int+ } } | 
+      attribute dimension { list { xsd:int+ } }) &
+    (element lower_left { list { xsd:double+ } } | 
+      attribute lower_left { list { xsd:double+ } }) &
+    (element upper_right { list { xsd:double+ } } | 
+      attribute upper_right { list { xsd:double+ } })
+  }?
+}
diff --git a/src/templates/tallies.rnc b/src/templates/tallies.rnc
new file mode 100644
index 000000000..081fdd179
--- /dev/null
+++ b/src/templates/tallies.rnc
@@ -0,0 +1,50 @@
+element tallies {
+  element mesh {
+    (element id { xsd:int } | attribute id { xsd:int }) &
+    (element type { ( "rectangular" | "hexagonal" ) } |
+      attribute type { ( "rectangular" | "hexagonal" ) }) &
+    (element dimension { list { xsd:int+ } } |
+      attribute dimension { list { xsd:int+ } }) &
+    (element lower_left { list { xsd:double+ } } |
+      attribute lower_left { list { xsd:double+ } }) &
+    (
+      (element upper_right { list { xsd:double+ } } |
+        attribute upper_right { list { xsd:double+ } }) |
+      (element width { list { xsd:double+ } } |
+        attribute width { list { xsd:double+ } })
+    )
+  }* &
+
+  element tally {
+    (element id { xsd:int } | attribute id { xsd:int }) &
+    (element label { xsd:string { maxLength="52" } } |
+      attribute label { xsd:string { maxLength="52" } })? &
+    (element estimator { ( "analog" | "tracklength" ) } |
+      attribute estimator { ( "analog" | "tracklength" ) })? &
+    element filters {
+      (element cell { list { xsd:string { maxLength = "20" } } } |
+        attribute cell { list { xsd:string { maxLength = "20" } } })? &
+      (element surface { list { xsd:string { maxLength = "20" } } } |
+        attribute surface { list { xsd:string { maxLength = "20" } } })? &
+      (element universe { list { xsd:string { maxLength = "20" } } } |
+        attribute universe { list { xsd:string { maxLength = "20" } } })? &
+      (element material { list { xsd:string { maxLength = "20" } } } |
+        attribute material { list { xsd:string { maxLength = "20" } } })? &
+      (element mesh { xsd:int } | attribute mesh { xsd:int })? &
+      (element cellborn { list { xsd:string { maxLength = "20" } } } |
+        attribute cellborn { list { xsd:string { maxLength = "20" } } })? &
+      (element energy { list { xsd:double+ } } |
+        attribute energy { list { xsd:double+ } })? &
+      (element energyout { list { xsd:double+ } } |
+        attribute energyout { list { xsd:double+ } })?
+    }? &
+    element nuclides {
+      list { xsd:string { maxLength = "20" }+ }
+    }? &
+    element scores { 
+      list { xsd:string { maxLength = "12" }+ }
+    }
+  }* &
+
+  element assume_separate { ( "off" | "on" ) }?
+}