3 files changed, 15 insertions, 5 deletions
diff --git a/src/core/common/Utils.cpp b/src/core/common/Utils.cpp
index fc8ee00..f8b53c6 100644
--- a/src/core/common/Utils.cpp
+++ b/src/core/common/Utils.cpp
@@ -37,22 +37,27 @@ bool Utils::isIdentifier(const std::string &name)
 		}
 		first = false;
 	}
-	return true;
+	return !first;
 }
 
-bool Utils::isNamespaceIdentifier(const std::string &name)
+bool Utils::isIdentifierOrEmpty(const std::string &name)
+{
+	return name.empty() || isIdentifier(name);
+}
+
+bool Utils::isNamespacedIdentifier(const std::string &name)
 {
 	bool first = true;
 	for (char c : name) {
 		if (first && !isIdentifierStartCharacter(c)) {
 			return false;
 		}
-		if (!first && (!isIdentifierCharacter(c) || c == ':')) {
+		if (!first && (!isIdentifierCharacter(c) && c != ':')) {
 			return false;
 		}
 		first = (c == ':');
 	}
-	return true;
+	return !first;
 }
 
 bool Utils::hasNonWhitepaceChar(const std::string &s)
diff --git a/src/core/common/Utils.hpp b/src/core/common/Utils.hpp
index b5cd178..b5a54fc 100644
--- a/src/core/common/Utils.hpp
+++ b/src/core/common/Utils.hpp
@@ -86,6 +86,11 @@ public:
 	static bool isIdentifier(const std::string &name);
 
 	/**
+	 * Returns true if the given string is an identifier or an empty string.
+	 */
+	static bool isIdentifierOrEmpty(const std::string &name);
+
+	/**
 	 * Returns true if the given string is in
 	 * \code{.txt}
 	 * ([A-Za-z][A-Za-z0-9_-]*)(:[A-Za-z][A-Za-z0-9_-]*)*
diff --git a/src/core/model/Node.cpp b/src/core/model/Node.cpp
index 39ee2e4..ce15cad 100644
--- a/src/core/model/Node.cpp
+++ b/src/core/model/Node.cpp
@@ -448,7 +448,7 @@ bool Node::doValidate(Logger &logger) const { return true; }
 
 bool Node::validateName(Logger &logger) const
 {
-	if (!Utils::isIdentifier(name)) {
+	if (!Utils::isIdentifierOrEmpty(name)) {
 		logger.error(type()->name + std::string(" name \"") + name +
 		                 std::string("\" is not a valid identifier"),
 		             this);