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XPath function: boolean processing-instruction (string?)

Standard excerpt:

The node test processing-instruction() is true for any processing instruction. The processing-instruction() test may have an argument that is Literal; in this case, it is true for any processing instruction that has a name equal to the value of the Literal. Examples (xslt:xml): Overview
50:10 51:10

Interactive xlab: [xsl:value-of] [xsl:template]