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If the '''namespace''' attribute is missing or empty the null namespace is used. | If the '''namespace''' attribute is missing or empty the null namespace is used. | ||
It is not an error to specify a parameter name that does not exist in the stylesheet (or that is a variable in the stylesheet). The PI is simply ignored. | |||
If both '''value''' and '''select''' is present the '''value''' attribute is ignored. If neither '''value''' nor '''select''' is present the PI is ignored. | If both '''value''' and '''select''' is present the '''value''' attribute is ignored. If neither '''value''' nor '''select''' is present the PI is ignored. | ||
Note that value="..." is not strictly equal to select="'...'" since the value can contain both apostrophe and quote characters. | |||
==== The select attribute context ==== | ==== The select attribute context ==== | ||