XPath基础语法(转)

1. "/" /AAA:      <AAA>           <BBB/>           <CCC/>           <BBB/>           <BBB/>           <DDD>                <BBB/>            <DDD>           <CCC/>       <AAA> /AAA/CCC: <AAA>           <BBB/>           <CCC/>           <BBB/>           <BBB/>           <DDD>                <BBB/>            <DDD>           <CCC/>       <AAA>  /AAA/DDD/BBB:  <AAA>           <BBB/>           <CCC/>           <BBB/>           <BBB/>           <DDD>                <BBB/>            <DDD>           <CCC/>       <AAA> 2. "//"  //BBB  <AAA>           <BBB/>           <CCC/>           <BBB/>           <DDD>                <BBB/>           <DDD>           <CCC>                <DDD>                     <BBB/>                     <BBB/>                <DDD>           <CCC>      <AAA>  //DDD/BBB     <AAA>           <BBB/>           <CCC/>           <BBB/>           <DDD>                <BBB/>           DDD>           <CCC>                <DDD>                     <BBB/>                     <BBB/>                <DDD>           <CCC>      <AAA> 3. "*":  /AAA/CCC/DDD/*  <AAA>           <XXX>                <DDD>                     <BBB/>                     <BBB/>                     <EEE/>                     <FFF/>                 <DDD>            <XXX>           <CCC>                <DDD>                     <BBB/>                     <BBB/>                     <EEE/>                     <FFF/>                 <DDD>            <CCC>           <CCC>                <BBB>                     <BBB>                          <BBB/>                      <BBB>                 <BBB>            <CCC>       <AAA>  /*/*/*/BBB       <AAA>           <XXX>                <DDD>                     <BBB/>                     <BBB/>                     <EEE/>                     <FFF/>                 <DDD>            <XXX>           <CCC>                <DDD>                     <BBB/>                     <BBB/>                     <EEE/>                     <FFF/>                 <DDD>            <CCC>           <CCC>                <BBB>                     <BBB>                          <BBB/>                      <BBB>                 <BBB>            <CCC>       <AAA> //*      <AAA>           <XXX>                <DDD>                     <BBB/>                     <BBB/>                     <EEE/>                     <FFF/>                DDD>           XXX>           <CCC>                <DDD>                     <BBB/>                     <BBB/>                     <EEE/>                     <FFF/>                DDD>           CCC>       AAA> 4. [1] , last() /AAA/BBB[1]      <AAA>           <BBB/>           <BBB/>           <BBB/>           <BBB/>      AAA> /AAA/BBB[last()]      <AAA>           <BBB/>           <BBB/>           <BBB/>           <BBB/>      AAA> 5. "@" : //@id      <AAA>           <BBB id = "b1"/>           <BBB id = "b2"/>           <BBB name = "bbb"/>           <BBB/>      AAA> //BBB[@id]      <AAA>           <BBB id = "b1"/>           <BBB id = "b2"/>           <BBB name = "bbb"/>           <BBB/>      AAA> //BBB[@name]      <AAA>           <BBB id = "b1"/>           <BBB id = "b2"/>           <BBB name = "bbb"/>           <BBB/>      AAA> //BBB[@*]      <AAA>           <BBB id = "b1"/>           <BBB id = "b2"/>           <BBB name = "bbb"/>           <BBB/>      AAA>

//BBB[not(@*)]      <AAA>           <BBB id = "b1"/>           <BBB id = "b2"/>           <BBB name = "bbb"/>           <BBB/>      AAA> //BBB[@id='b1']      <AAA>           <BBB id = "b1"/>           <BBB name = " bbb "/>           <BBB name = "bbb"/>      AAA> //BBB[@name='bbb']      <AAA>           <BBB id = "b1"/>           <BBB name = " bbb "/>           <BBB name = "bbb"/>      AAA> //BBB[normalize-space(@name)='bbb']      <AAA>           <BBB id = "b1"/>           <BBB name = "     bbb "/>           <BBB name = "bbb"/>      AAA> 6. count() : //*[count(BBB)=2]      <AAA>           <CCC>                <BBB/>                <BBB/>                <BBB/>           CCC>           <DDD>                <BBB/>                <BBB/>           DDD>           <EEE>                <CCC/>                <DDD/>           EEE>      AAA> //*[count(*)=2]      <AAA>           <CCC>                <BBB/>                <BBB/>                <BBB/>           CCC>           <DDD>                <BBB/>                <BBB/>           DDD>           <EEE>                <CCC/>                <DDD/>           EEE>      AAA> //*[count(*)=3]      <AAA>           <CCC>                <BBB/>                <BBB/>                <BBB/>           CCC>           <DDD>                <BBB/>                <BBB/>           DDD>           <EEE>                <CCC/>                <DDD/>           EEE>      AAA> 7. name() : //*[name()='BBB']      <AAA>           <BCC>                <BBB/>                <BBB/>                <BBB/>           BCC>           <DDB>                <BBB/>                <BBB/>           DDB>           <BEC>                <CCC/>                <DBD/>           BEC>      AAA> //*[starts-with(name(),'B')]      <AAA>           <BCC>                <BBB/>                <BBB/>                <BBB/>           BCC>           <DDB>                <BBB/>                <BBB/>           DDB>           <BEC>                <CCC/>                <DBD/>           BEC>      AAA> //*[contains(name(),'C')]      <AAA>           <BCC>                <BBB/>                <BBB/>                <BBB/>           BCC>           <DDB>                <BBB/>                <BBB/>           DDB>           <BEC>                <CCC/>                <DBD/>           BEC>      AAA> 8. string-length() : //*[string-length(name()) = 3]      <AAA>           <Q/>           <SSSS/>           <BB/>           <CCC/>           <DDDDDDDD/>           <EEEE/>      AAA> //*[string-length(name()) < 3]      <AAA>           <Q/>           <SSSS/>           <BB/>           <CCC/>           <DDDDDDDD/>           <EEEE/>      AAA> //*[string-length(name()) > 3]      <AAA>           <Q/>           <SSSS/>           <BB/>           <CCC/>           <DDDDDDDD/>           <EEEE/>      AAA> 9. "|" : //CCC | //BBB      <AAA>           <BBB/>           <CCC/>           <DDD>                <CCC/>           DDD>           <EEE/>      AAA> /AAA/EEE | //BBB      <AAA>           <BBB/>           <CCC/>           <DDD>                <CCC/>           DDD>           <EEE/>      AAA> /AAA/EEE | //DDD/CCC | /AAA | //BBB      <AAA>           <BBB/>           <CCC/>           <DDD>                <CCC/>           DDD>           <EEE/>      AAA>