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This study evaluates the validity, strictness, and markup quality of Italian Public Institutions' websites based on their compliance with different DTDs. By defining metrics to quantify expected errors and comparing documents with different DTDs, meaningful insights about the code validity can be derived.
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Problem addressed HTML 4.01 strict, XHTML 1.0 strict or superior are allowed by the Italian regulations Distinct dominions not easily comparable 43% of Italian Public institutions homepages are declared DTD strict Meaningful synthesis about code validity cannot simply exclude 57% of monitored Web contents 1
Strategy We issued an experimental approach, thereby defining a metrics to: quantify expected errors on a target DTD from a different one; evaluate 3 properties: validity, strictness, markup quality. Such a metrics can be generalized to: approach a more general instance about comparing documents with different DTDs. 2
We defined the expected number of errors for a given DTD as: We called the couple: (x'i, x''i) Errors Springing Up Rate(ESUR). They are computed, based on a wide sample of sites according to a couple of weighted averages on errors about DTDs. a sample of 1000 Web sites has been used to compute x'i and x''i as follows: Strategy (2) 3
