hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/VertexLabelBuilder.java [408:429]:
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    private void checkProperties(Action action) {
        switch (action) {
            case INSERT:
            case APPEND:
                for (String key : this.properties) {
                    this.graph().propertyKey(key);
                }
                break;
            case ELIMINATE:
                if (!this.properties.isEmpty()) {
                    throw new NotAllowException(
                              "Not support to eliminate properties " +
                              "for vertex label currently");
                }
                break;
            case DELETE:
                break;
            default:
                throw new AssertionError(String.format(
                          "Unknown schema action '%s'", action));
        }
    }
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hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/EdgeLabelBuilder.java [418:439]:
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    private void checkProperties(Action action) {
        switch (action) {
            case INSERT:
            case APPEND:
                for (String key : this.properties) {
                    this.graph().propertyKey(key);
                }
                break;
            case ELIMINATE:
                if (!this.properties.isEmpty()) {
                    throw new NotAllowException(
                              "Not support to eliminate properties " +
                              "for edge label currently");
                }
                break;
            case DELETE:
                break;
            default:
                throw new AssertionError(String.format(
                          "Unknown schema action '%s'", action));
        }
    }
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