所以我有当前的XML文档：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<?xml-stylesheet type="text/xsl" href="couriersystem.xsl"?>
<couriersystem title="Courier System"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="couriersystem.xsd">
<branches>
<branch bid="1">
<name>Headquarters</name>
<address>
58, Main Street, Edinburgh, R79 2LR
</address>
<manager mid="1" />
<headoffice hid="1" />
<!-- delivery methods -->
<deliverymethods>
<method name="none" />
</deliverymethods>
</branch>
<branch bid="2">
<name>Convenience Local Branch</name>
<address>
118, Renfrew Avenue, Dumfries, J6 8CZ
</address>
<manager mid="2" />
<headoffice hid="1" />
<!-- delivery methods -->
<deliverymethods>
<method name="bicycle" />
<method name="car" />
</deliverymethods>
</branch>
<branch bid="3">
<name>Westwood Shopping Centre</name>
<address>
119, London Street, Nidrie, F57 8NE
</address>
<manager mid="3" />
<headoffice hid="1" />
<!-- delivery methods -->
<deliverymethods>
<method name="bicycle" />
</deliverymethods>
</branch>
<branch bid="4">
<name>Logistics Warehouse</name>
<address>
160, Main Road, Dunfermline, A15 0PO
</address>
<manager mid="4" />
<headoffice hid="1" />
<!-- delivery methods -->
<deliverymethods>
<method name="car" />
<method name="van" />
</deliverymethods>
</branch>
<branch bid="5">
<name>Kingdom of Fife Shopping Centre</name>
<address>
92, Central Lane, Dunfermline, U38 2OD
</address>
<manager mid="5" />
<headoffice hid="7" />
<!-- delivery methods -->
<deliverymethods>
<method name="bicycle" />
<method name="car" />
</deliverymethods>
</branch>
<branch bid="6">
<name>Capital Branch</name>
<address>
95, High Street, Inverness, W91 8IW
</address>
<manager mid="6" />
<headoffice hid="7" />
<!-- delivery methods -->
<deliverymethods>
<method name="car" />
<method name="van" />
</deliverymethods>
</branch>
<branch bid="7">
<name>Glasgow City</name>
<address>
94, Harris Place, BathgateGlasgow, E74 2MR
</address>
<manager mid="7" />
<headoffice hid="1" />
<!-- delivery methods -->
<deliverymethods>
<method name="car" />
</deliverymethods>
</branch>
<branch bid="8">
<name>Edinburgh Omni Centre</name>
<address>
119, West Road, Edinburgh, A79 2EG
</address>
<manager mid="8" />
<headoffice hid="1" />
<!-- delivery methods -->
<deliverymethods>
<method name="none" />
</deliverymethods>
</branch>
<branch bid="9">
<name>Royal Plaza</name>
<address>
81, Royal Plaza, BathgateGlasgow, U52 7GV
</address>
<manager mid="9" />
<headoffice hid="7" />
<!-- delivery methods -->
<deliverymethods>
<method name="bicycle" />
<method name="car" />
</deliverymethods>
</branch>
</branches>
<employees>
<employee eid="1">
<nin>AZ123518D</nin>
<firstname>Peter</firstname>
<lastname>Smith</lastname>
<gender>Male</gender>
<dob>1994-02-11</dob>
<email>ps11@gmail.com</email>
<address>
119, London Street, Nidrie, F57 8NE
</address>
<tel>07005748900</tel>
<salary>30526</salary>
<empbranch bid="1" />
<supervisor sid="1" />
</employee>
<employee eid="2">
<nin>CN174869F</nin>
<firstname>Jennifer</firstname>
<lastname>Black</lastname>
<gender>Male</gender>
<dob>1984-12-24</dob>
<email>jb21@gmail.com</email>
<address>
161, South Road, Nidrie, W79 8WG
</address>
<tel>07555111222</tel>
<salary>40576</salary>
<empbranch bid="2" />
<supervisor sid="1" />
</employee>
<employee eid="3">
<nin>ET127654M</nin>
<firstname>Aaron</firstname>
<lastname>Jones</lastname>
<gender>Male</gender>
<dob>1968-03-15</dob>
<email>aj31@gmail.com</email>
<address>
66, High Road, Yoker, Q47 4SR
</address>
<tel>07856471267</tel>
<salary>30526</salary>
<empbranch bid="3" />
<supervisor sid="1" />
</employee>
<employee eid="4">
<nin>GC765238A</nin>
<firstname>Alistair</firstname>
<lastname>Smith</lastname>
<gender>Male</gender>
<dob>1976-11-26</dob>
<email>as11@gmail.com</email>
<address>
109, West Plaza, Clydebank, G55 8RC
</address>
<tel>07000123123</tel>
<salary>25400</salary>
<empbranch bid="4" />
<supervisor sid="1" />
</employee>
<employee eid="5">
<nin>HP146854D</nin>
<firstname>Emma</firstname>
<lastname>Reynolds</lastname>
<gender>Male</gender>
<dob>1995-05-05</dob>
<email>er11@yahoo.com</email>
<address>
57, Scott Street, Aberdeen, O75 2KS
</address>
<tel>07625361536</tel>
<salary>25400</salary>
<empbranch bid="5" />
<supervisor sid="7" />
</employee>
<employee eid="6">
<nin>JA213465F</nin>
<firstname>Taylor</firstname>
<lastname>Smith</lastname>
<gender>Male</gender>
<dob>1983-08-25</dob>
<email>taysmith@hotmail.co.uk</email>
<address>
6, West Place, Perth, F65 9LK
</address>
<tel>07765665123</tel>
<salary>26940</salary>
<empbranch bid="6" />
<supervisor sid="7" />
</employee>
<employee eid="7">
<nin>PH173957M</nin>
<firstname>Jamie</firstname>
<lastname>White</lastname>
<gender>Male</gender>
<dob>1992-07-17</dob>
<email>jw21@gmail.com</email>
<address>
85, West Street, BathgateGlasgow, W1 6KH
</address>
<tel>07649284671</tel>
<salary>26940</salary>
<empbranch bid="7" />
<supervisor sid="1" />
</employee>
<employee eid="8">
<nin>RG185656A</nin>
<firstname>Oliver</firstname>
<lastname>Jack</lastname>
<gender>Male</gender>
<dob>1990-09-09</dob>
<email>oj21@hotmail.com</email>
<address>
173, London Street, Edinburgh, V66 5BI
</address>
<tel>07987612635</tel>
<salary>26940</salary>
<empbranch bid="8" />
<supervisor sid="1" />
</employee>
<employee eid="9">
<nin>TE199927D</nin>
<firstname>Nicole</firstname>
<lastname>Summers</lastname>
<gender>Male</gender>
<dob>1988-01-12</dob>
<email>ns31@gmail.com</email>
<address>
104, North Lane, Perth, J3 7WP
</address>
<tel>07998812671</tel>
<salary>26940</salary>
<empbranch bid="9" />
<supervisor sid="7" />
</employee>
<employee eid="10">
<nin>WC333245F</nin>
<firstname>Barney</firstname>
<lastname>Brown</lastname>
<gender>Male</gender>
<dob>1990-10-10</dob>
<email>bb31@yahoo.com</email>
<address>
173, London Street, Edinburgh, V66 5BI
</address>
<tel>07111346572</tel>
<salary>25400</salary>
<empbranch bid="1" />
<supervisor sid="1" />
</employee>
</employees>
<customers>
<customer cid="1">
<firstname>Sam</firstname>
<lastname>Mitchell</lastname>
<gender>Male</gender>
<dob>1991-12-12</dob>
<email>sammitch@hotmail.co.uk</email>
<address>
161, South Road, Nidrie, W79 8WG
</address>
<tel>07811119542</tel>
<cbranch bid="2" />
</customer>
<customer cid="2">
<firstname>Chris</firstname>
<lastname>Bernards</lastname>
<gender>Male</gender>
<dob>1976-04-05</dob>
<email>berny5476@gmail.com</email>
<address>
179, Park Street, Inverness, Z27 0YU
</address>
<tel>07565641232</tel>
<cbranch bid="3" />
</customer>
<customer cid="3">
<firstname>Markus</firstname>
<lastname>Imrie</lastname>
<gender>Male</gender>
<dob>1995-06-20</dob>
<email>markus117@gmail.com</email>
<address>
49, Ferry Plaza, Dunfermline, D24 1VD
</address>
<tel>07712312488</tel>
<cbranch bid="1" />
</customer>
<customer cid="4">
<firstname>Ryan</firstname>
<lastname>Murray</lastname>
<gender>Male</gender>
<dob>1995-06-23</dob>
<email>murray_ryan@hotmail.co.uk</email>
<address>
186, Skye Avenue, Inverness, K56 0MX
</address>
<tel>07508611248</tel>
<cbranch bid="6" />
</customer>
<customer cid="5">
<firstname>Alice</firstname>
<lastname>Montgomery</lastname>
<gender>Female</gender>
<dob>1985-01-01</dob>
<email>alicemont@btinternet.com</email>
<address>
158, John Road, Clydebank, P23 8DW
</address>
<tel>07560002143</tel>
<cbranch bid="8" />
</customer>
<customer cid="6">
<firstname>Daniel</firstname>
<lastname>West</lastname>
<gender>Male</gender>
<dob>1966-06-06</dob>
<email>danielwest@gmail.com</email>
<address>
94, Regent Avenue, Perth, S34 9TE
</address>
<tel>07454651321</tel>
<cbranch bid="4" />
</customer>
<customer cid="7">
<firstname>George</firstname>
<lastname>Burnett</lastname>
<gender>Male</gender>
<dob>1978-09-06</dob>
<email>gb205@hotmail.co.uk</email>
<address>
76, South Lane, Aberdeen, V28 0TF
</address>
<tel>07562537541</tel>
<cbranch bid="9" />
</customer>
<customer cid="8">
<firstname>Katie</firstname>
<lastname>Drummond</lastname>
<gender>Female</gender>
<dob>1993-11-16</dob>
<email>katiedrummond@gmail.com</email>
<address>
45, West Road, Edinburgh, A79 2EG
</address>
<tel>07654546123</tel>
<cbranch bid="5" />
</customer>
<customer cid="9">
<firstname>Lizzie</firstname>
<lastname>Alderan</lastname>
<gender>Female</gender>
<dob>1976-05-28</dob>
<email>lizziealderan@gmail.com</email>
<address>
49, Ferry Plaza, Dunfermline, D24 1VD
</address>
<tel>07651246572</tel>
<cbranch bid="7" />
</customer>
<customer cid="10">
<firstname>Rebecca</firstname>
<lastname>Almond</lastname>
<gender>Female</gender>
<dob>1997-03-30</dob>
<email>beckyalmond@gmail.com</email>
<address>
13, Harris Place, BathgateGlasgow, E74 2MR
</address>
<tel>07876123451</tel>
<cbranch bid="8" />
</customer>
</customers>
<packages>
<package pid="1" cid="3">
<name>ACER Aspire F5-571 Laptop</name>
<weight>3.5</weight>
<price>30</price>
<category></category>
</package>
<package pid="2" cid="6">
<name>Apple iPad Mini</name>
<weight>0.7</weight>
<price>20</price>
<category></category>
</package>
<package pid="3" cid="7">
<name>Black Leather Shoes</name>
<weight>2</weight>
<price>5</price>
<category></category>
</package>
<package pid="4" cid="10">
<name>Swarovski Silver Necklace</name>
<weight>0.1</weight>
<price>10</price>
<category></category>
</package>
<package pid="5" cid="8">
<name>Adele 25 CD</name>
<weight>0.2</weight>
<price>3</price>
<category></category>
</package>
<package pid="6" cid="9">
<name>The Maze Runner Book</name>
<weight>0.5</weight>
<price>5</price>
<category></category>
</package>
<package pid="7" cid="1">
<name>Game of Thrones: The Complete Collection</name>
<weight>3.1</weight>
<price>25</price>
<category></category>
</package>
<package pid="8" cid="5">
<name>Assassins Creed: Syndicate Xbox</name>
<weight>0.2</weight>
<price>5</price>
<category></category>
</package>
<package pid="9" cid="4">
<name>Sony S52 Wireless Speakers</name>
<weight>0.8</weight>
<price>10</price>
<category></category>
</package>
<package pid="10" cid="2">
<name>Reebok ZR10 Treadmill</name>
<weight>74.2</weight>
<price>50</price>
<category></category>
</package>
</packages>
</couriersystem>
我只是想从中创建几个xpath表达式。
到目前为止，我正在努力让所有员工按照他们工作的分支机构的顺序。我已经尝试过这个xpath表达式，但我似乎无法正确/工作：
key('bid', $employee/empbranch)/@bid
任何帮助将不胜感激！感谢
编辑：我也试过了，但没有结果：
/couriersystem/employees/employee[/couriersystem/branches/branch/@bid = @empbranch]/@firstname
答案 0 :(得分：1)
@符号查找属性，但是empbranch是包含@bid属性的元素，与firstname一样。此外，string（）调用将采用名字字符串本身。
我认为您正在寻找的表达方式是：
/couriersystem/employees/employee[/couriersystem/branches/branch/@bid = empbranch/@bid]/string(firstname)
至于按分支顺序列出员工，以下XQuery完成工作：
for $branch in /couriersystem/branches/branch
let $employees := /couriersystem/employees/employee[$branch/@bid = empbranch/@bid]/string(firstname)
return <branch bid="{$branch/@bid}">{
for $employee in $employees
return <employee>{$employee}</employee>
}</branch>
纯XPath 2.0解决方案（无法创建新节点）将是：
for $branch in /couriersystem/branches/branch
return
/couriersystem/employees/employee[$branch/@bid = empbranch/@bid]/string(firstname)
我不确定密钥查找是否可以使其更快，因为您需要流式传输所有分支机构以及每个分支机构内的所有员工。
我希望这有帮助！