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The underlying technologies used by Web services bring known vulnerabilities to a new environment as well as increased targeting by attackers. The classical approaches--knowledge and signature based, respectively--for attack detection either produce high false positive detection rates or fails to detect attack variations, leading to 0-day attacks. To counter this trend, an ontology can help build a strategy-based knowledge attack database. A novel hybrid attack detection engine brings together the main advantages of knowledge- and signature-based classical approaches. Moreover, it is capable of mitigating 0-day attacks for XML injection, with no false positive detection rates.