1<grammar xmlns="http://relaxng.org/ns/structure/1.0"> 2 <start> 3 <ref name="head"/> 4 </start> 5 <define name="head"> 6 <element name="head"> 7 <interleave> 8 <ref name="title"/> 9 <optional> 10 <ref name="base"/> 11 </optional> 12 <zeroOrMore> 13 <ref name="style"/> 14 </zeroOrMore> 15 <zeroOrMore> 16 <ref name="script"/> 17 </zeroOrMore> 18 <zeroOrMore> 19 <ref name="link"/> 20 </zeroOrMore> 21 <zeroOrMore> 22 <ref name="meta"/> 23 </zeroOrMore> 24 </interleave> 25 </element> 26 </define> 27 <define name="title"> 28 <element name="title"> 29 <text/> 30 </element> 31 </define> 32 <define name="base"> 33 <element name="base"> 34 <text/> 35 </element> 36 </define> 37 <define name="style"> 38 <element name="style"> 39 <text/> 40 </element> 41 </define> 42 <define name="script"> 43 <element name="script"> 44 <text/> 45 </element> 46 </define> 47 <define name="meta"> 48 <element name="meta"> 49 <text/> 50 </element> 51 </define> 52 <define name="link"> 53 <element name="link"> 54 <text/> 55 </element> 56 </define> 57</grammar> 58