public Builder strict(final boolean strict) {
            this.strict = strict;
            return this;
        }
When set to true, exceptions will be thrown if a property value cannot be coerced to the expected data
type. If set to false, then the reader will continue with the import but ignore the failed property key.
By default this value is "true".
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphml/GraphMLReader.java