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xsl：fallback

It is worth noting , though , that xsl: fallback only applies to one instruction at a time .

Extension instructions must allow xsl: fallback as a child element .

There is the possibility of nested xsl: fallback elements , where you guard against a 2 . 0 instruction and an extension instruction .

The 1. 0 processor simply ignores all children except the xsl: fallback elements and executes those in order .