diff --git a/.mps/modules.xml b/.mps/modules.xml
index 3168245..30a036d 100644
--- a/.mps/modules.xml
+++ b/.mps/modules.xml
@@ -3,6 +3,9 @@
   <component name="MPSProject">
     <projectModules>
       <modulePath path="$PROJECT_DIR$/languages/MultiRefLang/MultiRefLang.mpl" folder="test.langs" />
+      <modulePath path="$PROJECT_DIR$/languages/f1re.lionweb.examples.expression.lang/f1re.lionweb.examples.expression.lang.mpl" folder="" />
+      <modulePath path="$PROJECT_DIR$/languages/f1re.lionweb.examples.expression.lang/runtime/f1re.lionweb.examples.expression.lang.runtime.msd" folder="" />
+      <modulePath path="$PROJECT_DIR$/languages/f1re.lionweb.examples.expression.lang/sandbox/f1re.lionweb.examples.expression.lang.sandbox.msd" folder="" />
       <modulePath path="$PROJECT_DIR$/languages/io.lionweb.mps.converter.TestAbstract/io.lionweb.mps.converter.TestAbstract.mpl" folder="test.langs" />
       <modulePath path="$PROJECT_DIR$/languages/io.lionweb.mps.converter.TestAllBuiltins/io.lionweb.mps.converter.TestAllBuiltins.mpl" folder="test.langs" />
       <modulePath path="$PROJECT_DIR$/languages/io.lionweb.mps.converter.TestAnnotation/io.lionweb.mps.converter.TestAnnotation.mpl" folder="test.langs" />
@@ -38,6 +41,7 @@
       <modulePath path="$PROJECT_DIR$/languages/io.lionweb.mps.testsupport/io.lionweb.mps.testsupport.mpl" folder="test.support" />
       <modulePath path="$PROJECT_DIR$/languages/library/library.mpl" folder="test.langs" />
       <modulePath path="$PROJECT_DIR$/solutions/bla/bla.msd" folder="xx_broken" />
+      <modulePath path="$PROJECT_DIR$/solutions/export_to_json/export_to_json.msd" folder="" />
       <modulePath path="$PROJECT_DIR$/solutions/io.lionweb.lionweb.java/io.lionweb.lionweb.java.msd" folder="lang.json" />
       <modulePath path="$PROJECT_DIR$/solutions/io.lionweb.mps.build/io.lionweb.mps.build.msd" folder="build" />
       <modulePath path="$PROJECT_DIR$/solutions/io.lionweb.mps.client.connector/io.lionweb.mps.client.connector.msd" folder="client" />
diff --git a/languages/f1re.lionweb.examples.expression.lang/f1re.lionweb.examples.expression.lang.mpl b/languages/f1re.lionweb.examples.expression.lang/f1re.lionweb.examples.expression.lang.mpl
new file mode 100644
index 0000000..2f0b683
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/f1re.lionweb.examples.expression.lang.mpl
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<language namespace="f1re.lionweb.examples.expression.lang" uuid="cb040d18-c16c-43ca-aa17-cd9d4a630491" languageVersion="0" moduleVersion="0">
+  <models>
+    <modelRoot contentPath="${module}" type="default">
+      <sourceRoot location="models" />
+    </modelRoot>
+  </models>
+  <facets>
+    <facet type="java">
+      <classes generated="true" path="${module}/classes_gen" />
+    </facet>
+  </facets>
+  <accessoryModels />
+  <sourcePath />
+  <languageVersions>
+    <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="12" />
+    <language slang="l:443f4c36-fcf5-4eb6-9500-8d06ed259e3e:jetbrains.mps.baseLanguage.classifiers" version="0" />
+    <language slang="l:fd392034-7849-419d-9071-12563d152375:jetbrains.mps.baseLanguage.closures" version="0" />
+    <language slang="l:83888646-71ce-4f1c-9c53-c54016f6ad4f:jetbrains.mps.baseLanguage.collections" version="1" />
+    <language slang="l:f2801650-65d5-424e-bb1b-463a8781b786:jetbrains.mps.baseLanguage.javadoc" version="2" />
+    <language slang="l:c7d5b9dd-a05f-4be2-bc73-f2e16994cc67:jetbrains.mps.baseLanguage.lightweightdsl" version="1" />
+    <language slang="l:760a0a8c-eabb-4521-8bfd-65db761a9ba3:jetbrains.mps.baseLanguage.logging" version="0" />
+    <language slang="l:a247e09e-2435-45ba-b8d2-07e93feba96a:jetbrains.mps.baseLanguage.tuples" version="0" />
+    <language slang="l:aee9cad2-acd4-4608-aef2-0004f6a1cdbd:jetbrains.mps.lang.actions" version="4" />
+    <language slang="l:af65afd8-f0dd-4942-87d9-63a55f2a9db1:jetbrains.mps.lang.behavior" version="2" />
+    <language slang="l:fe9d76d7-5809-45c9-ae28-a40915b4d6ff:jetbrains.mps.lang.checkedName" version="1" />
+    <language slang="l:3f4bc5f5-c6c1-4a28-8b10-c83066ffa4a1:jetbrains.mps.lang.constraints" version="6" />
+    <language slang="l:e51810c5-7308-4642-bcb6-469e61b5dd18:jetbrains.mps.lang.constraints.msg.specification" version="0" />
+    <language slang="l:47257bf3-78d3-470b-89d9-8c3261a61d15:jetbrains.mps.lang.constraints.rules" version="0" />
+    <language slang="l:5dae8159-ab99-46bb-a40d-0cee30ee7018:jetbrains.mps.lang.constraints.rules.kinds" version="0" />
+    <language slang="l:134c38d4-e3af-4d9e-b069-1c7df0a4005d:jetbrains.mps.lang.constraints.rules.skeleton" version="0" />
+    <language slang="l:3ad5badc-1d9c-461c-b7b1-fa2fcd0a0ae7:jetbrains.mps.lang.context" version="0" />
+    <language slang="l:ea3159bf-f48e-4720-bde2-86dba75f0d34:jetbrains.mps.lang.context.defs" version="0" />
+    <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="2" />
+    <language slang="l:f4ad079d-bc71-4ffb-9600-9328705cf998:jetbrains.mps.lang.descriptor" version="0" />
+    <language slang="l:18bc6592-03a6-4e29-a83a-7ff23bde13ba:jetbrains.mps.lang.editor" version="14" />
+    <language slang="l:d7a92d38-f7db-40d0-8431-763b0c3c9f20:jetbrains.mps.lang.intentions" version="1" />
+    <language slang="l:ad93155d-79b2-4759-b10c-55123e763903:jetbrains.mps.lang.messages" version="0" />
+    <language slang="l:446c26eb-2b7b-4bf0-9b35-f83fa582753e:jetbrains.mps.lang.modelapi" version="0" />
+    <language slang="l:d4615e3b-d671-4ba9-af01-2b78369b0ba7:jetbrains.mps.lang.pattern" version="2" />
+    <language slang="l:3a13115c-633c-4c5c-bbcc-75c4219e9555:jetbrains.mps.lang.quotation" version="5" />
+    <language slang="l:982eb8df-2c96-4bd7-9963-11712ea622e5:jetbrains.mps.lang.resources" version="2" />
+    <language slang="l:b3551702-269c-4f05-ba61-58060cef4292:jetbrains.mps.lang.rulesAndMessages" version="0" />
+    <language slang="l:d8f591ec-4d86-4af2-9f92-a9e93c803ffa:jetbrains.mps.lang.scopes" version="0" />
+    <language slang="l:13744753-c81f-424a-9c1b-cf8943bf4e86:jetbrains.mps.lang.sharedConcepts" version="0" />
+    <language slang="l:7866978e-a0f0-4cc7-81bc-4d213d9375e1:jetbrains.mps.lang.smodel" version="19" />
+    <language slang="l:c72da2b9-7cce-4447-8389-f407dc1158b7:jetbrains.mps.lang.structure" version="9" />
+    <language slang="l:c7fb639f-be78-4307-89b0-b5959c3fa8c8:jetbrains.mps.lang.text" version="0" />
+    <language slang="l:9ded098b-ad6a-4657-bfd9-48636cfe8bc3:jetbrains.mps.lang.traceable" version="0" />
+    <language slang="l:7a5dda62-9140-4668-ab76-d5ed1746f2b2:jetbrains.mps.lang.typesystem" version="5" />
+  </languageVersions>
+  <dependencyVersions>
+    <module reference="3f233e7f-b8a6-46d2-a57f-795d56775243(Annotations)" version="0" />
+    <module reference="6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)" version="0" />
+    <module reference="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea(MPS.Core)" version="0" />
+    <module reference="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
+    <module reference="cb040d18-c16c-43ca-aa17-cd9d4a630491(f1re.lionweb.examples.expression.lang)" version="0" />
+    <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
+    <module reference="a9e4c532-c5f5-4bb7-99ef-42abb73bbb70(jetbrains.mps.lang.descriptor.aspects)" version="0" />
+  </dependencyVersions>
+  <runtime>
+    <dependency reexport="false">57bd58e4-53f2-45c4-9bbe-958c87aeda7b(f1re.lionweb.examples.expression.lang.runtime)</dependency>
+  </runtime>
+  <extendedLanguages />
+</language>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.behavior.mps b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.behavior.mps
new file mode 100644
index 0000000..c406a9c
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.behavior.mps
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:c00afb0d-146d-405b-b876-089655b39dd6(f1re.lionweb.examples.expression.lang.behavior)">
+  <persistence version="9" />
+  <languages>
+    <use id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel" version="19" />
+    <use id="af65afd8-f0dd-4942-87d9-63a55f2a9db1" name="jetbrains.mps.lang.behavior" version="2" />
+    <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
+  </languages>
+  <imports />
+  <registry />
+</model>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.constraints.mps b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.constraints.mps
new file mode 100644
index 0000000..b12e9a5
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.constraints.mps
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:f7568ad3-f1a0-4052-b084-53e32303912c(f1re.lionweb.examples.expression.lang.constraints)">
+  <persistence version="9" />
+  <languages>
+    <use id="5dae8159-ab99-46bb-a40d-0cee30ee7018" name="jetbrains.mps.lang.constraints.rules.kinds" version="0" />
+    <use id="ea3159bf-f48e-4720-bde2-86dba75f0d34" name="jetbrains.mps.lang.context.defs" version="0" />
+    <use id="e51810c5-7308-4642-bcb6-469e61b5dd18" name="jetbrains.mps.lang.constraints.msg.specification" version="0" />
+    <use id="134c38d4-e3af-4d9e-b069-1c7df0a4005d" name="jetbrains.mps.lang.constraints.rules.skeleton" version="0" />
+    <use id="b3551702-269c-4f05-ba61-58060cef4292" name="jetbrains.mps.lang.rulesAndMessages" version="0" />
+    <use id="3f4bc5f5-c6c1-4a28-8b10-c83066ffa4a1" name="jetbrains.mps.lang.constraints" version="6" />
+    <use id="13744753-c81f-424a-9c1b-cf8943bf4e86" name="jetbrains.mps.lang.sharedConcepts" version="0" />
+    <use id="3ad5badc-1d9c-461c-b7b1-fa2fcd0a0ae7" name="jetbrains.mps.lang.context" version="0" />
+    <use id="ad93155d-79b2-4759-b10c-55123e763903" name="jetbrains.mps.lang.messages" version="0" />
+    <devkit ref="00000000-0000-4000-0000-5604ebd4f22c(jetbrains.mps.devkit.aspect.constraints)" />
+  </languages>
+  <imports />
+  <registry />
+</model>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.editor.mps b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.editor.mps
new file mode 100644
index 0000000..713b404
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.editor.mps
@@ -0,0 +1,192 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:8cfbd8fa-d508-4b7b-98f9-146946f35487(f1re.lionweb.examples.expression.lang.editor)">
+  <persistence version="9" />
+  <languages>
+    <use id="18bc6592-03a6-4e29-a83a-7ff23bde13ba" name="jetbrains.mps.lang.editor" version="14" />
+    <use id="aee9cad2-acd4-4608-aef2-0004f6a1cdbd" name="jetbrains.mps.lang.actions" version="4" />
+    <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
+  </languages>
+  <imports>
+    <import index="nobk" ref="r:d07d494c-5c11-45df-8542-bfd3eb9526a0(f1re.lionweb.examples.expression.lang.structure)" implicit="true" />
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
+  </imports>
+  <registry>
+    <language id="18bc6592-03a6-4e29-a83a-7ff23bde13ba" name="jetbrains.mps.lang.editor">
+      <concept id="1071666914219" name="jetbrains.mps.lang.editor.structure.ConceptEditorDeclaration" flags="ig" index="24kQdi" />
+      <concept id="1140524381322" name="jetbrains.mps.lang.editor.structure.CellModel_ListWithRole" flags="ng" index="2czfm3">
+        <child id="1140524464360" name="cellLayout" index="2czzBx" />
+      </concept>
+      <concept id="1106270549637" name="jetbrains.mps.lang.editor.structure.CellLayout_Horizontal" flags="nn" index="2iRfu4" />
+      <concept id="1106270571710" name="jetbrains.mps.lang.editor.structure.CellLayout_Vertical" flags="nn" index="2iRkQZ" />
+      <concept id="1237303669825" name="jetbrains.mps.lang.editor.structure.CellLayout_Indent" flags="nn" index="l2Vlx" />
+      <concept id="1080736578640" name="jetbrains.mps.lang.editor.structure.BaseEditorComponent" flags="ig" index="2wURMF">
+        <child id="1080736633877" name="cellModel" index="2wV5jI" />
+      </concept>
+      <concept id="1149850725784" name="jetbrains.mps.lang.editor.structure.CellModel_AttributedNodeCell" flags="ng" index="2SsqMj" />
+      <concept id="1186403694788" name="jetbrains.mps.lang.editor.structure.ColorStyleClassItem" flags="ln" index="VaVBg">
+        <property id="1186403713874" name="color" index="Vb096" />
+      </concept>
+      <concept id="1186403751766" name="jetbrains.mps.lang.editor.structure.FontStyleStyleClassItem" flags="ln" index="Vb9p2">
+        <property id="1186403771423" name="style" index="Vbekb" />
+      </concept>
+      <concept id="1186404549998" name="jetbrains.mps.lang.editor.structure.ForegroundColorStyleClassItem" flags="ln" index="VechU" />
+      <concept id="1186404574412" name="jetbrains.mps.lang.editor.structure.BackgroundColorStyleClassItem" flags="ln" index="Veino" />
+      <concept id="1186414928363" name="jetbrains.mps.lang.editor.structure.SelectableStyleSheetItem" flags="ln" index="VPM3Z" />
+      <concept id="1088013125922" name="jetbrains.mps.lang.editor.structure.CellModel_RefCell" flags="sg" stub="730538219795941030" index="1iCGBv">
+        <child id="1088186146602" name="editorComponent" index="1sWHZn" />
+      </concept>
+      <concept id="1088185857835" name="jetbrains.mps.lang.editor.structure.InlineEditorComponent" flags="ig" index="1sVBvm" />
+      <concept id="1139848536355" name="jetbrains.mps.lang.editor.structure.CellModel_WithRole" flags="ng" index="1$h60E">
+        <property id="1140017977771" name="readOnly" index="1Intyy" />
+        <reference id="1140103550593" name="relationDeclaration" index="1NtTu8" />
+      </concept>
+      <concept id="1073389446423" name="jetbrains.mps.lang.editor.structure.CellModel_Collection" flags="sn" stub="3013115976261988961" index="3EZMnI">
+        <child id="1106270802874" name="cellLayout" index="2iSdaV" />
+        <child id="1073389446424" name="childCellModel" index="3EZMnx" />
+      </concept>
+      <concept id="1073389577006" name="jetbrains.mps.lang.editor.structure.CellModel_Constant" flags="sn" stub="3610246225209162225" index="3F0ifn">
+        <property id="1073389577007" name="text" index="3F0ifm" />
+      </concept>
+      <concept id="1073389658414" name="jetbrains.mps.lang.editor.structure.CellModel_Property" flags="sg" stub="730538219796134133" index="3F0A7n" />
+      <concept id="1219418625346" name="jetbrains.mps.lang.editor.structure.IStyleContainer" flags="ng" index="3F0Thp">
+        <child id="1219418656006" name="styleItem" index="3F10Kt" />
+      </concept>
+      <concept id="1073389882823" name="jetbrains.mps.lang.editor.structure.CellModel_RefNode" flags="sg" stub="730538219795960754" index="3F1sOY" />
+      <concept id="1073390211982" name="jetbrains.mps.lang.editor.structure.CellModel_RefNodeList" flags="sg" stub="2794558372793454595" index="3F2HdR" />
+      <concept id="1198256887712" name="jetbrains.mps.lang.editor.structure.CellModel_Indent" flags="ng" index="3XFhqQ" />
+      <concept id="1166049232041" name="jetbrains.mps.lang.editor.structure.AbstractComponent" flags="ng" index="1XWOmA">
+        <reference id="1166049300910" name="conceptDeclaration" index="1XX52x" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="24kQdi" id="3DOxG9VMM6b">
+    <ref role="1XX52x" to="nobk:XBkqDNtu6U" resolve="Literal" />
+    <node concept="3F0A7n" id="3DOxG9VMMa9" role="2wV5jI">
+      <ref role="1NtTu8" to="nobk:XBkqDNtELX" resolve="value" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="3DOxG9VMMxU">
+    <ref role="1XX52x" to="nobk:7dTTRKBPmcO" resolve="VarReference" />
+    <node concept="1iCGBv" id="3DOxG9VMM_S" role="2wV5jI">
+      <ref role="1NtTu8" to="nobk:7dTTRKBPmyv" resolve="ref" />
+      <node concept="1sVBvm" id="3DOxG9VMM_U" role="1sWHZn">
+        <node concept="3F0A7n" id="3DOxG9VMMFS" role="2wV5jI">
+          <property role="1Intyy" value="true" />
+          <ref role="1NtTu8" to="nobk:7dTTRKBPkvf" resolve="varName" />
+        </node>
+      </node>
+    </node>
+  </node>
+  <node concept="24kQdi" id="3DOxG9VNcKe">
+    <ref role="1XX52x" to="nobk:7dTTRKBPkhs" resolve="VariableDefinition" />
+    <node concept="3EZMnI" id="3DOxG9VNde7" role="2wV5jI">
+      <node concept="3F0ifn" id="3DOxG9VNpvY" role="3EZMnx">
+        <property role="3F0ifm" value="var" />
+        <node concept="Vb9p2" id="3DOxG9VNqxo" role="3F10Kt">
+          <property role="Vbekb" value="g1_k_vY/BOLD" />
+        </node>
+      </node>
+      <node concept="3F0A7n" id="3DOxG9VNdBO" role="3EZMnx">
+        <ref role="1NtTu8" to="nobk:7dTTRKBPkvf" resolve="varName" />
+      </node>
+      <node concept="3F0ifn" id="3DOxG9VNdvU" role="3EZMnx">
+        <property role="3F0ifm" value="=" />
+      </node>
+      <node concept="3F1sOY" id="3DOxG9VNdNE" role="3EZMnx">
+        <ref role="1NtTu8" to="nobk:7dTTRKBPlDn" resolve="varValue" />
+      </node>
+      <node concept="l2Vlx" id="3DOxG9VNde8" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="3DOxG9VNgAk">
+    <ref role="1XX52x" to="nobk:XBkqDNttNN" resolve="BinaryExpression" />
+    <node concept="3EZMnI" id="3DOxG9VNgIe" role="2wV5jI">
+      <node concept="3F1sOY" id="3DOxG9VNhdS" role="3EZMnx">
+        <ref role="1NtTu8" to="nobk:XBkqDNttS2" resolve="leftOperand" />
+      </node>
+      <node concept="3F0A7n" id="3DOxG9VNgW6" role="3EZMnx">
+        <ref role="1NtTu8" to="nobk:XBkqDNtu2s" resolve="operation" />
+      </node>
+      <node concept="3F1sOY" id="3DOxG9VNh40" role="3EZMnx">
+        <ref role="1NtTu8" to="nobk:XBkqDNttUp" resolve="rightOperand" />
+      </node>
+      <node concept="l2Vlx" id="3DOxG9VNgIh" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="3DOxG9VNkK0">
+    <ref role="1XX52x" to="nobk:XBkqDNtaly" resolve="ExpressionsFile" />
+    <node concept="3EZMnI" id="3DOxG9VNANd" role="2wV5jI">
+      <node concept="2iRkQZ" id="3DOxG9VNANe" role="2iSdaV" />
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+          <property role="3F0ifm" value="file" />
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+            <property role="Vbekb" value="g1_k_vY/BOLD" />
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+            <property role="Vb096" value="fLwANPu/blue" />
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+          <node concept="Vb9p2" id="2rPquA6bWmF" role="3F10Kt">
+            <property role="Vbekb" value="g1_kEg4/ITALIC" />
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+          <node concept="VechU" id="2rPquA6bWUa" role="3F10Kt">
+            <property role="Vb096" value="fLwANPu/blue" />
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+  <node concept="24kQdi" id="2sMRQOj627i">
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+      <node concept="3F0ifn" id="2sMRQOj62fg" role="3EZMnx">
+        <property role="3F0ifm" value="comp" />
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+      <node concept="3F1sOY" id="2sMRQOj62jf" role="3EZMnx">
+        <ref role="1NtTu8" to="nobk:2sMRQOj61tH" resolve="expr" />
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+      <node concept="2iRfu4" id="2sMRQOj62bj" role="2iSdaV" />
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+
diff --git a/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.intentions.mps b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.intentions.mps
new file mode 100644
index 0000000..b8ec99a
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.intentions.mps
@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:41d34048-55e8-469e-be68-61b425cc08e2(f1re.lionweb.examples.expression.lang.intentions)">
+  <persistence version="9" />
+  <languages>
+    <use id="d7a92d38-f7db-40d0-8431-763b0c3c9f20" name="jetbrains.mps.lang.intentions" version="1" />
+    <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
+  </languages>
+  <imports>
+    <import index="nobk" ref="r:d07d494c-5c11-45df-8542-bfd3eb9526a0(f1re.lionweb.examples.expression.lang.structure)" implicit="true" />
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
+  </imports>
+  <registry>
+    <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
+        <child id="1197027771414" name="operand" index="2Oq$k0" />
+        <child id="1197027833540" name="operation" index="2OqNvi" />
+      </concept>
+      <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
+        <child id="1137022507850" name="body" index="2VODD2" />
+      </concept>
+      <concept id="1070475926800" name="jetbrains.mps.baseLanguage.structure.StringLiteral" flags="nn" index="Xl_RD">
+        <property id="1070475926801" name="value" index="Xl_RC" />
+      </concept>
+      <concept id="1068580123155" name="jetbrains.mps.baseLanguage.structure.ExpressionStatement" flags="nn" index="3clFbF">
+        <child id="1068580123156" name="expression" index="3clFbG" />
+      </concept>
+      <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
+        <child id="1068581517665" name="statement" index="3cqZAp" />
+      </concept>
+    </language>
+    <language id="d7a92d38-f7db-40d0-8431-763b0c3c9f20" name="jetbrains.mps.lang.intentions">
+      <concept id="1192794744107" name="jetbrains.mps.lang.intentions.structure.IntentionDeclaration" flags="ig" index="2S6QgY" />
+      <concept id="1192794782375" name="jetbrains.mps.lang.intentions.structure.DescriptionBlock" flags="in" index="2S6ZIM" />
+      <concept id="1192795911897" name="jetbrains.mps.lang.intentions.structure.ExecuteBlock" flags="in" index="2Sbjvc" />
+      <concept id="1192796902958" name="jetbrains.mps.lang.intentions.structure.ConceptFunctionParameter_node" flags="nn" index="2Sf5sV" />
+      <concept id="2522969319638091381" name="jetbrains.mps.lang.intentions.structure.BaseIntentionDeclaration" flags="ig" index="2ZfUlf">
+        <reference id="2522969319638198290" name="forConcept" index="2ZfgGC" />
+        <child id="2522969319638198291" name="executeFunction" index="2ZfgGD" />
+        <child id="2522969319638093993" name="descriptionFunction" index="2ZfVej" />
+      </concept>
+    </language>
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
+      <concept id="1139184414036" name="jetbrains.mps.lang.smodel.structure.LinkList_AddNewChildOperation" flags="nn" index="WFELt">
+        <reference id="1139877738879" name="concept" index="1A0vxQ" />
+      </concept>
+      <concept id="1138056282393" name="jetbrains.mps.lang.smodel.structure.SLinkListAccess" flags="nn" index="3Tsc0h">
+        <reference id="1138056546658" name="link" index="3TtcxE" />
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+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
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+        <property id="1169194664001" name="name" index="TrG5h" />
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+          <node concept="2OqwBi" id="2sMRQOj6$wa" role="3clFbG">
+            <node concept="2OqwBi" id="2sMRQOj6yJJ" role="2Oq$k0">
+              <node concept="2Sf5sV" id="2sMRQOj6yCo" role="2Oq$k0" />
+              <node concept="3Tsc0h" id="2sMRQOj6yXC" role="2OqNvi">
+                <ref role="3TtcxE" to="tpck:4uZwTti3__2" resolve="smodelAttribute" />
+              </node>
+            </node>
+            <node concept="WFELt" id="2sMRQOj6BLP" role="2OqNvi">
+              <ref role="1A0vxQ" to="nobk:2sMRQOj5sRi" resolve="Documentation" />
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+          </node>
+        </node>
+      </node>
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+</model>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.structure.mps b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.structure.mps
new file mode 100644
index 0000000..a9f4fae
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.structure.mps
@@ -0,0 +1,209 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:d07d494c-5c11-45df-8542-bfd3eb9526a0(f1re.lionweb.examples.expression.lang.structure)">
+  <persistence version="9" />
+  <languages>
+    <use id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure" version="9" />
+    <devkit ref="78434eb8-b0e5-444b-850d-e7c4ad2da9ab(jetbrains.mps.devkit.aspect.structure)" />
+  </languages>
+  <imports>
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
+  </imports>
+  <registry>
+    <language id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure">
+      <concept id="3348158742936976480" name="jetbrains.mps.lang.structure.structure.EnumerationMemberDeclaration" flags="ng" index="25R33">
+        <property id="1421157252384165432" name="memberId" index="3tVfz5" />
+        <property id="672037151186491528" name="presentation" index="1L1pqM" />
+      </concept>
+      <concept id="3348158742936976479" name="jetbrains.mps.lang.structure.structure.EnumerationDeclaration" flags="ng" index="25R3W">
+        <reference id="1075010451642646892" name="defaultMember" index="1H5jkz" />
+        <child id="3348158742936976577" name="members" index="25R1y" />
+      </concept>
+      <concept id="6054523464626862044" name="jetbrains.mps.lang.structure.structure.AttributeInfo_IsMultiple" flags="ng" index="tn0Fv" />
+      <concept id="6054523464627964745" name="jetbrains.mps.lang.structure.structure.AttributeInfo_AttributedConcept" flags="ng" index="trNpa">
+        <reference id="6054523464627965081" name="concept" index="trN6q" />
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+      <concept id="1082978164218" name="jetbrains.mps.lang.structure.structure.DataTypeDeclaration" flags="ng" index="AxPO6">
+        <property id="7791109065626895363" name="datatypeId" index="3F6X1D" />
+      </concept>
+      <concept id="2992811758677295509" name="jetbrains.mps.lang.structure.structure.AttributeInfo" flags="ng" index="M6xJ_">
+        <property id="7588428831955550663" name="role" index="Hh88m" />
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+        <reference id="1071489389519" name="extends" index="1TJDcQ" />
+        <child id="1169129564478" name="implements" index="PzmwI" />
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+      <concept id="1071489288299" name="jetbrains.mps.lang.structure.structure.PropertyDeclaration" flags="ig" index="1TJgyi">
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+      <concept id="1071489288298" name="jetbrains.mps.lang.structure.structure.LinkDeclaration" flags="ig" index="1TJgyj">
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+        <property id="1071599937831" name="metaClass" index="20lmBu" />
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+        <property id="1169194664001" name="name" index="TrG5h" />
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+    <property role="TrG5h" value="ExpressionsFile" />
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+    <ref role="1TJDcQ" node="XBkqDNttKI" resolve="Expression" />
+    <node concept="1TJgyj" id="7dTTRKBPmyv" role="1TKVEi">
+      <property role="IQ2ns" value="8320936306973960351" />
+      <property role="20kJfa" value="ref" />
+      <property role="20lbJX" value="fLJekj4/_1" />
+      <ref role="20lvS9" node="7dTTRKBPkhs" resolve="VariableDefinition" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="2sMRQOj5sRi">
+    <property role="EcuMT" value="2824565575879347666" />
+    <property role="TrG5h" value="Documentation" />
+    <ref role="1TJDcQ" to="tpck:2ULFgo8_XDk" resolve="NodeAttribute" />
+    <node concept="M6xJ_" id="2sMRQOj5teV" role="lGtFl">
+      <property role="Hh88m" value="docs" />
+      <node concept="tn0Fv" id="2sMRQOj5tkQ" role="HhnKV" />
+      <node concept="trNpa" id="2sMRQOj60yA" role="EQaZv">
+        <ref role="trN6q" node="2sMRQOj5YKn" resolve="Statement" />
+      </node>
+    </node>
+    <node concept="1TJgyi" id="2sMRQOj5xsG" role="1TKVEl">
+      <property role="IQ2nx" value="2824565575879366444" />
+      <property role="TrG5h" value="body" />
+      <ref role="AX2Wp" to="tpck:fKAOsGN" resolve="string" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="2sMRQOj5YKn">
+    <property role="EcuMT" value="2824565575879486487" />
+    <property role="TrG5h" value="Statement" />
+    <property role="R5$K7" value="true" />
+    <ref role="1TJDcQ" to="tpck:gw2VY9q" />
+  </node>
+  <node concept="1TIwiD" id="2sMRQOj60Ir">
+    <property role="EcuMT" value="2824565575879494555" />
+    <property role="TrG5h" value="Computation" />
+    <ref role="1TJDcQ" node="2sMRQOj5YKn" resolve="Statement" />
+    <node concept="1TJgyj" id="2sMRQOj61tH" role="1TKVEi">
+      <property role="IQ2ns" value="2824565575879497581" />
+      <property role="20lmBu" value="fLJjDmT/aggregation" />
+      <property role="20kJfa" value="expr" />
+      <property role="20lbJX" value="fLJekj4/_1" />
+      <ref role="20lvS9" node="XBkqDNttKI" resolve="Expression" />
+    </node>
+  </node>
+</model>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.typesystem.mps b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.typesystem.mps
new file mode 100644
index 0000000..34fd8c1
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/models/f1re.lionweb.examples.expression.lang.typesystem.mps
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:2590aef2-0cd1-4374-b0b1-ae49af95f471(f1re.lionweb.examples.expression.lang.typesystem)">
+  <persistence version="9" />
+  <languages>
+    <use id="7a5dda62-9140-4668-ab76-d5ed1746f2b2" name="jetbrains.mps.lang.typesystem" version="5" />
+    <devkit ref="00000000-0000-4000-0000-1de82b3a4936(jetbrains.mps.devkit.aspect.typesystem)" />
+  </languages>
+  <imports />
+  <registry />
+</model>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/runtime/f1re.lionweb.examples.expression.lang.runtime.msd b/languages/f1re.lionweb.examples.expression.lang/runtime/f1re.lionweb.examples.expression.lang.runtime.msd
new file mode 100644
index 0000000..78e6dec
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/runtime/f1re.lionweb.examples.expression.lang.runtime.msd
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<solution name="f1re.lionweb.examples.expression.lang.runtime" uuid="57bd58e4-53f2-45c4-9bbe-958c87aeda7b" moduleVersion="0" compileInMPS="true">
+  <models>
+    <modelRoot contentPath="${module}" type="default">
+      <sourceRoot location="models" />
+    </modelRoot>
+  </models>
+  <facets>
+    <facet type="java">
+      <classes generated="true" path="${module}/classes_gen" />
+    </facet>
+  </facets>
+  <sourcePath />
+  <languageVersions />
+  <dependencyVersions>
+    <module reference="57bd58e4-53f2-45c4-9bbe-958c87aeda7b(f1re.lionweb.examples.expression.lang.runtime)" version="0" />
+  </dependencyVersions>
+</solution>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/runtime/models/f1re.lionweb.examples.expression.lang.runtime.mps b/languages/f1re.lionweb.examples.expression.lang/runtime/models/f1re.lionweb.examples.expression.lang.runtime.mps
new file mode 100644
index 0000000..e11af22
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/runtime/models/f1re.lionweb.examples.expression.lang.runtime.mps
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:12ee7b2e-c7be-4642-a8c1-466da8e13dcc(f1re.lionweb.examples.expression.lang.runtime)">
+  <persistence version="9" />
+  <languages />
+  <imports />
+  <registry />
+</model>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/sandbox/f1re.lionweb.examples.expression.lang.sandbox.msd b/languages/f1re.lionweb.examples.expression.lang/sandbox/f1re.lionweb.examples.expression.lang.sandbox.msd
new file mode 100644
index 0000000..8aa7d24
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/sandbox/f1re.lionweb.examples.expression.lang.sandbox.msd
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<solution name="f1re.lionweb.examples.expression.lang.sandbox" uuid="fddcc0c9-86e9-4f00-b4d4-37c07e7f9305" moduleVersion="0" compileInMPS="true">
+  <models>
+    <modelRoot contentPath="${module}" type="default">
+      <sourceRoot location="models" />
+    </modelRoot>
+  </models>
+  <facets>
+    <facet type="java">
+      <classes generated="true" path="${module}/classes_gen" />
+    </facet>
+  </facets>
+  <sourcePath />
+  <languageVersions>
+    <language slang="l:cb040d18-c16c-43ca-aa17-cd9d4a630491:f1re.lionweb.examples.expression.lang" version="0" />
+    <language slang="l:97ef2b8d-23e1-433e-8d23-48f916dd314d:io.lionweb.mps.converter.lang" version="0" />
+    <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="2" />
+  </languageVersions>
+  <dependencyVersions>
+    <module reference="fddcc0c9-86e9-4f00-b4d4-37c07e7f9305(f1re.lionweb.examples.expression.lang.sandbox)" version="0" />
+  </dependencyVersions>
+</solution>
+
diff --git a/languages/f1re.lionweb.examples.expression.lang/sandbox/models/f1re.lionweb.examples.expression.lang.sandbox.mps b/languages/f1re.lionweb.examples.expression.lang/sandbox/models/f1re.lionweb.examples.expression.lang.sandbox.mps
new file mode 100644
index 0000000..b34144f
--- /dev/null
+++ b/languages/f1re.lionweb.examples.expression.lang/sandbox/models/f1re.lionweb.examples.expression.lang.sandbox.mps
@@ -0,0 +1,130 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:fe6da1a8-aec7-4d02-99e9-ede02d391588(f1re.lionweb.examples.expression.lang.sandbox)">
+  <persistence version="9" />
+  <languages>
+    <use id="cb040d18-c16c-43ca-aa17-cd9d4a630491" name="f1re.lionweb.examples.expression.lang" version="0" />
+    <use id="97ef2b8d-23e1-433e-8d23-48f916dd314d" name="io.lionweb.mps.converter.lang" version="0" />
+  </languages>
+  <imports />
+  <registry>
+    <language id="97ef2b8d-23e1-433e-8d23-48f916dd314d" name="io.lionweb.mps.converter.lang">
+      <concept id="3631234780355719700" name="io.lionweb.mps.converter.lang.structure.NodeRef" flags="ng" index="pgsVv">
+        <reference id="3631234780355720143" name="target" index="pgsW4" />
+      </concept>
+      <concept id="3631234780355716573" name="io.lionweb.mps.converter.lang.structure.ExportInstanceToJson" flags="ng" index="pgt$m">
+        <property id="3631234780355961878" name="scope" index="pjpzt" />
+        <child id="3631234780355719074" name="instances" index="pgtdD" />
+      </concept>
+      <concept id="5028875375328515023" name="io.lionweb.mps.converter.lang.structure.ImportInstanceFromJson" flags="ng" index="VS7hd" />
+      <concept id="5028875375328515028" name="io.lionweb.mps.converter.lang.structure.APathConverter" flags="ng" index="VS7hm">
+        <property id="5028875375328515031" name="path" index="VS7hl" />
+      </concept>
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
+      </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+    <language id="cb040d18-c16c-43ca-aa17-cd9d4a630491" name="f1re.lionweb.examples.expression.lang">
+      <concept id="2824565575879347666" name="f1re.lionweb.examples.expression.lang.structure.Documentation" flags="ng" index="O9LaZ">
+        <property id="2824565575879366444" name="body" index="O9cx1" />
+      </concept>
+      <concept id="2824565575879494555" name="f1re.lionweb.examples.expression.lang.structure.Computation" flags="ng" index="OaHjQ">
+        <child id="2824565575879497581" name="expr" index="OaGw0" />
+      </concept>
+      <concept id="8320936306973958964" name="f1re.lionweb.examples.expression.lang.structure.VarReference" flags="ng" index="1kF8h8">
+        <reference id="8320936306973960351" name="ref" index="1kF8Zz" />
+      </concept>
+      <concept id="8320936306973951068" name="f1re.lionweb.examples.expression.lang.structure.VariableDefinition" flags="ng" index="1kFacw">
+        <property id="8320936306973951951" name="varName" index="1kFa2N" />
+        <child id="8320936306973956695" name="varValue" index="1kFbOF" />
+      </concept>
+      <concept id="1109945625693510899" name="f1re.lionweb.examples.expression.lang.structure.BinaryExpression" flags="ng" index="1W4CPp">
+        <property id="1109945625693511836" name="operation" index="1W4F4Q" />
+        <child id="1109945625693511321" name="rightOperand" index="1W4CWN" />
+        <child id="1109945625693511170" name="leftOperand" index="1W4CYC" />
+      </concept>
+      <concept id="1109945625693512122" name="f1re.lionweb.examples.expression.lang.structure.Literal" flags="ng" index="1W4F0g">
+        <property id="1109945625693564029" name="value" index="1W4vRn" />
+      </concept>
+      <concept id="1109945625693431138" name="f1re.lionweb.examples.expression.lang.structure.ExpressionsFile" flags="ng" index="1W4Zj8">
+        <child id="2824565575879488001" name="body" index="O9iPG" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="pgt$m" id="XBkqDNtFzO">
+    <property role="TrG5h" value="exprInstance2json" />
+    <property role="VS7hl" value="${f1re.lionweb.home}/lionweb-rascal/input/TestExpressionsFile.json" />
+    <property role="pjpzt" value="39$JcGFainl/descendants" />
+    <node concept="pgsVv" id="3DC$Mii3fED" role="pgtdD">
+      <ref role="pgsW4" node="2sMRQOj6eje" resolve="TestExprs" />
+    </node>
+  </node>
+  <node concept="VS7hd" id="6yZW992IMIX">
+    <property role="TrG5h" value="json2exprInstance" />
+    <property role="VS7hl" value="${f1re.lionweb.home}/lionweb-rascal/output/ExampleExpressionsFile.json" />
+  </node>
+  <node concept="1W4Zj8" id="2sMRQOj6eje">
+    <property role="TrG5h" value="TestExprs" />
+    <node concept="OaHjQ" id="2sMRQOj6et5" role="O9iPG">
+      <node concept="1W4CPp" id="2sMRQOj6ez1" role="OaGw0">
+        <node concept="1W4F0g" id="2sMRQOj6eD1" role="1W4CYC">
+          <property role="1W4vRn" value="30" />
+        </node>
+        <node concept="1W4F0g" id="2sMRQOj6eGZ" role="1W4CWN">
+          <property role="1W4vRn" value="20" />
+        </node>
+      </node>
+    </node>
+    <node concept="1kFacw" id="2sMRQOj6eOU" role="O9iPG">
+      <property role="1kFa2N" value="x" />
+      <node concept="1W4F0g" id="2sMRQOj6eSS" role="1kFbOF">
+        <property role="1W4vRn" value="50" />
+      </node>
+      <node concept="O9LaZ" id="2sMRQOj6IFP" role="lGtFl">
+        <property role="O9cx1" value="this is a test variable assignment" />
+      </node>
+    </node>
+  </node>
+  <node concept="1W4Zj8" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCgwLDY3LDwxLDA-LDw0LDg-KQ">
+    <property role="TrG5h" value="ExampleExpressionsFile" />
+    <node concept="1kFacw" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCgwLDQ2LDwxLDA-LDwyLDU-KQ" role="O9iPG">
+      <property role="1kFa2N" value="x" />
+      <node concept="1W4F0g" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg0NSwxLDwyLDQ-LDwyLDU-KQ" role="1kFbOF">
+        <property role="1W4vRn" value="5000" />
+      </node>
+      <node concept="O9LaZ" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg1LDM1LDwxLDU-LDwxLDQwPik" role="lGtFl">
+        <property role="O9cx1" value="this is a variable definition for x" />
+      </node>
+    </node>
+    <node concept="OaHjQ" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg0OCw5LDwzLDA-LDwzLDk-KQ" role="O9iPG">
+      <node concept="1W4CPp" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg0OSw3LDwzLDE-LDwzLDg-KQ" role="OaGw0">
+        <property role="1W4F4Q" value="XBkqDNtu05/mult" />
+        <node concept="1W4F0g" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg0OSwzLDwzLDE-LDwzLDQ-KQ" role="1W4CYC">
+          <property role="1W4vRn" value="10000000" />
+        </node>
+        <node concept="1kF8h8" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg1NSwxLDwzLDc-LDwzLDg-KQ" role="1W4CWN">
+          <ref role="1kF8Zz" node="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCgwLDQ2LDwxLDA-LDwyLDU-KQ" />
+        </node>
+      </node>
+      <node concept="O9LaZ" id="55wWO1IW6BW" role="lGtFl">
+        <property role="O9cx1" value="hello langdev" />
+      </node>
+    </node>
+    <node concept="OaHjQ" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg1OSw4LDw0LDA-LDw0LDg-KQ" role="O9iPG">
+      <node concept="1W4CPp" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg2MCw2LDw0LDE-LDw0LDc-KQ" role="OaGw0">
+        <property role="1W4F4Q" value="minus" />
+        <node concept="1W4F0g" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg2MCwyLDw0LDE-LDw0LDM-KQ" role="1W4CYC">
+          <property role="1W4vRn" value="100000" />
+        </node>
+        <node concept="1W4F0g" id="~fHByb2plY3Q6Ly9saW9ud2ViLXJhc2NhbC9pbnB1dC9FeGFtcGxlRXhwcmVzc2lvbnNGaWxlLm1vZGVsfCg2NSwxLDw0LDY-LDw0LDc-KQ" role="1W4CWN">
+          <property role="1W4vRn" value="80000" />
+        </node>
+      </node>
+    </node>
+  </node>
+</model>
+
diff --git a/solutions/export_to_json/export_to_json.msd b/solutions/export_to_json/export_to_json.msd
new file mode 100644
index 0000000..3319589
--- /dev/null
+++ b/solutions/export_to_json/export_to_json.msd
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<solution name="export_to_json" uuid="8c64e6af-fa20-4a70-9fa4-689826fe8605" moduleVersion="0" compileInMPS="true">
+  <models>
+    <modelRoot contentPath="${module}" type="default">
+      <sourceRoot location="models" />
+    </modelRoot>
+  </models>
+  <facets>
+    <facet type="java">
+      <classes generated="true" path="${module}/classes_gen" />
+    </facet>
+  </facets>
+  <sourcePath />
+  <dependencies>
+    <dependency reexport="false">01cf0d82-8d29-4fc4-be96-28abaf4ad33d(io.lionweb.mps.m3)</dependency>
+  </dependencies>
+  <languageVersions>
+    <language slang="l:cb040d18-c16c-43ca-aa17-cd9d4a630491:f1re.lionweb.examples.expression.lang" version="0" />
+    <language slang="l:97ef2b8d-23e1-433e-8d23-48f916dd314d:io.lionweb.mps.converter.lang" version="0" />
+    <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="2" />
+  </languageVersions>
+  <dependencyVersions>
+    <module reference="3f233e7f-b8a6-46d2-a57f-795d56775243(Annotations)" version="0" />
+    <module reference="6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)" version="0" />
+    <module reference="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea(MPS.Core)" version="0" />
+    <module reference="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
+    <module reference="8c64e6af-fa20-4a70-9fa4-689826fe8605(export_to_json)" version="0" />
+    <module reference="01cf0d82-8d29-4fc4-be96-28abaf4ad33d(io.lionweb.mps.m3)" version="0" />
+    <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
+  </dependencyVersions>
+</solution>
+
diff --git a/solutions/export_to_json/models/export_to_json.expressions_example.mps b/solutions/export_to_json/models/export_to_json.expressions_example.mps
new file mode 100644
index 0000000..402ae98
--- /dev/null
+++ b/solutions/export_to_json/models/export_to_json.expressions_example.mps
@@ -0,0 +1,529 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:d68246e8-7415-40f6-9a79-15801cb69262(export_to_json.expressions_example)">
+  <persistence version="9" />
+  <languages>
+    <use id="cb040d18-c16c-43ca-aa17-cd9d4a630491" name="f1re.lionweb.examples.expression.lang" version="0" />
+    <use id="97ef2b8d-23e1-433e-8d23-48f916dd314d" name="io.lionweb.mps.converter.lang" version="0" />
+  </languages>
+  <imports>
+    <import index="2pzz" ref="r:74e14b22-3b4a-45ce-940b-9bdca99c102f(io.lionweb.mps.m3.builtin)" implicit="true" />
+  </imports>
+  <registry>
+    <language id="01cf0d82-8d29-4fc4-be96-28abaf4ad33d" name="io.lionweb.mps.m3">
+      <concept id="1313442573167736906" name="io.lionweb.mps.m3.structure.Annotation" flags="ng" index="2$GZ55">
+        <reference id="1313442573167736907" name="annotates" index="2$GZ54" />
+      </concept>
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