使用BaseX执行XQuery

Question

I am trying to use BaseX to run an XQuery with no success. I have tried typing commands like:

doc("Bookstore.xml")//Bookstore
//Bookstore
XQUERY[//Bookstore]

and i am getting these error messages:

Stopped at C:/tools/libxml/file, 1/32:
Unknown command: doc("Bookstore.xml")//Bookstore. Try HELP.

Stopped at C:/tools/libxml/file, 1/12:
Unknown command: //Bookstore. Try HELP.

Stopped at C:/tools/libxml/file, 1/20:
Unknown command: XQUERY[//Bookstore]. Try HELP.

whenever i try to hit Execute Query . How can i make this actually work? I am watching the Stanford tutorials but those commands that are showing there do not work on BaseX .

Below you can just see the file i am trying to query for educational purposes.

<?xml version="1.0" ?>
<!--Bookstore with no DTD-->

<Bookstore>
   <Book ISBN="ISBN-0-13-713526-2" Price="85" Edition="3rd">
      <Title>A First Course in Database Systems</Title>
      <Authors>
         <Author>
            <First_Name>Jeffrey</First_Name>
            <Last_Name>Ullman</Last_Name>
         </Author>
         <Author>
            <First_Name>Jennifer</First_Name>
            <Last_Name>Widom</Last_Name>
         </Author>
      </Authors>
   </Book>
   <Book ISBN="ISBN-0-13-815504-6" Price="100">
      <Remark>
      Buy this book bundled with "A First Course" - a great deal!
      </Remark>
      <Title>Database Systems: The Complete Book</Title>
      <Authors>
         <Author>
            <First_Name>Hector</First_Name>
            <Last_Name>Garcia-Molina</Last_Name>
         </Author>
         <Author>
            <First_Name>Jeffrey</First_Name>
            <Last_Name>Ullman</Last_Name>
         </Author>
         <Author>
            <First_Name>Jennifer</First_Name>
            <Last_Name>Widom</Last_Name>
         </Author>
      </Authors>
   </Book>
</Bookstore>

EDIT

Answer 1

If you're running BaseX commands, for example in the BaseX command line client or the GUI command input line, you have to prefix the query with the command XQUERY . BaseX commands are separated by whitespace from their parameters, so in your case, run any of

XQUERY //Bookstore
XQUERY doc('Bookstore.xml')//Bookstore

depending on whether the document (database) is already opened or not.

If you're using the BaseX GUI , you can also directly put the query into the query window, then you don't need the XQUERY command prefix at all and directly one of those (like above)

//Bookstore
//doc('Bookstore.xml')//Bookstore

---

Anyway: You'll probably want to use /Bookstore instead: at least if I'm guessing correctly and you want to query the root element, and not all <Bookstore/> elements in the whole document.