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Despite revealing the same overall topology , the Iso-XFEM method provided a superior structural stiffness as compared to the BESO implementation for the same amount of iterations and identical mesh-size .
 concept or principle: topology; process characterization: Iso-XFEM method; machanical property: stiffness; material: as; concept or principle: BESO implementation
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: topology; process characterization: Iso-XFEM method; machanical property: stiffness; material: as; concept or principle: BESO implementation