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diff --git a/dom/xslt/xslt/txXSLTFunctions.h b/dom/xslt/xslt/txXSLTFunctions.h
new file mode 100644
index 0000000000..4b7401eb83
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+++ b/dom/xslt/xslt/txXSLTFunctions.h
@@ -0,0 +1,149 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef TRANSFRMX_XSLT_FUNCTIONS_H
+#define TRANSFRMX_XSLT_FUNCTIONS_H
+
+#include "mozilla/UniquePtr.h"
+#include "txExpr.h"
+#include "txXMLUtils.h"
+#include "txNamespaceMap.h"
+
+class txStylesheet;
+
+/**
+ * The definition for the XSLT document() function
+ **/
+class DocumentFunctionCall : public FunctionCall {
+ public:
+  /**
+   * Creates a new document() function call
+   **/
+  explicit DocumentFunctionCall(const nsAString& aBaseURI);
+
+  TX_DECL_FUNCTION
+
+ private:
+  nsString mBaseURI;
+};
+
+/*
+ * The definition for the XSLT key() function
+ */
+class txKeyFunctionCall : public FunctionCall {
+ public:
+  /*
+   * Creates a new key() function call
+   */
+  explicit txKeyFunctionCall(txNamespaceMap* aMappings);
+
+  TX_DECL_FUNCTION
+
+ private:
+  RefPtr<txNamespaceMap> mMappings;
+};
+
+/**
+ * The definition for the XSLT format-number() function
+ **/
+class txFormatNumberFunctionCall : public FunctionCall {
+ public:
+  /**
+   * Creates a new format-number() function call
+   **/
+  txFormatNumberFunctionCall(txStylesheet* aStylesheet,
+                             txNamespaceMap* aMappings);
+
+  TX_DECL_FUNCTION
+
+ private:
+  static const char16_t FORMAT_QUOTE;
+
+  enum FormatParseState {
+    Prefix,
+    IntDigit,
+    IntZero,
+    FracZero,
+    FracDigit,
+    Suffix,
+    Finished
+  };
+
+  // Helper that reports and invalid arg to the provided context.
+  void ReportInvalidArg(txIEvalContext* aContext);
+
+  txStylesheet* mStylesheet;
+  RefPtr<txNamespaceMap> mMappings;
+};
+
+/**
+ * DecimalFormat
+ * A representation of the XSLT element <xsl:decimal-format>
+ */
+class txDecimalFormat {
+ public:
+  /*
+   * Creates a new decimal format and initilizes all properties with
+   * default values
+   */
+  txDecimalFormat();
+  bool isEqual(txDecimalFormat* other);
+
+  char16_t mDecimalSeparator;
+  char16_t mGroupingSeparator;
+  nsString mInfinity;
+  char16_t mMinusSign;
+  nsString mNaN;
+  char16_t mPercent;
+  char16_t mPerMille;
+  char16_t mZeroDigit;
+  char16_t mDigit;
+  char16_t mPatternSeparator;
+};
+
+/**
+ * The definition for the XSLT current() function
+ **/
+class CurrentFunctionCall : public FunctionCall {
+ public:
+  /**
+   * Creates a new current() function call
+   **/
+  CurrentFunctionCall();
+
+  TX_DECL_FUNCTION
+};
+
+/**
+ * The definition for the XSLT generate-id() function
+ **/
+class GenerateIdFunctionCall : public FunctionCall {
+ public:
+  /**
+   * Creates a new generate-id() function call
+   **/
+  GenerateIdFunctionCall();
+
+  TX_DECL_FUNCTION
+};
+
+/**
+ * A system-property(), element-available() or function-available() function.
+ */
+class txXSLTEnvironmentFunctionCall : public FunctionCall {
+ public:
+  enum eType { SYSTEM_PROPERTY, ELEMENT_AVAILABLE, FUNCTION_AVAILABLE };
+
+  txXSLTEnvironmentFunctionCall(eType aType, txNamespaceMap* aMappings)
+      : mType(aType), mMappings(aMappings) {}
+
+  TX_DECL_FUNCTION
+
+ private:
+  eType mType;
+  RefPtr<txNamespaceMap> mMappings;  // Used to resolve prefixes
+};
+
+#endif