Output DTDs for "XML Query Use Cases" from mmurata@trl.ibm.co.jp on 2001-07-06 (www-xml-query-comments@w3.org from July 2001)

From: <mmurata@trl.ibm.co.jp>
Date: Fri, 06 Jul 2001 11:09:41 +0900 (LMT)
To: www-xml-query-comments@w3.org
cc: atozawa@trl.ibm.co.jp, mmurata@trl.ibm.co.jp
Message-Id: <20010706110941C.mmurata@trl.ibm.com>
Dear colleagues,

Tozawa-san at IBM Tokyo Research Lab and I have read "XML Query Use
Cases" (W3C) and quickly constructed output DTDs for sample queries in
this document.

We have not tried to construct the tightest DTDs, but I believe 
that our DTDs are very reasonable.

Note: Not wearing the IBM hat, I will translate them to RELAX NG soon. 

Cheers,

MURATA Makoto (FAMILY Given)
*Currently visiting IBM Tokyo Research Lab 

--------------------------------------------------------------------

Section 1.1

Q1

Output DTD

<!ELEMENT bib (book*)>
<!ELEMENT book (title)>
<!ATTLIST book year CDATA #IMPLIED>
<!ELEMENT title (#PCDATA)>

Q2


<!ELEMENT results (result*)>
<!ELEMENT result (title, author)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (last,first)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT first (#PCDATA)>

Q3

<!ELEMENT results (result*)>
<!ELEMENT result (title, author+)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (last,first)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT first (#PCDATA)>


Q4

<!ELEMENT results (result*)>
<!ELEMENT result (author, title+)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (last,first)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT first (#PCDATA)>


Q5

<!ELEMENT books-with-prices (book-with-price*)>
<!ELEMENT books-with-price  (title, price-amazon, price-bn)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT price-amazon (#PCDATA)>
<!ELEMENT price-bn     (#PCDATA)>

Q6

<!ELEMENT bib (book*)>
<!ELEMENT book (title,author, (author | et-al)?>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (last,first)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT first (#PCDATA)>
<!ELEMENT et-al EMTPY>

Q7

<!ELEMENT bib (book*)
<!ELEMENT book (title)>
<!ATTLIST book year CDATA #REQUIRED>
<!ELEMENT title (#PCDATA)>

Q8

<!-- Hedges rather than trees -->
<!ELEMENT book (book)>
<!ELEMENT book (title, author)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (last,first)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT first (#PCDATA)>

Q9

<!ELEMENT results (title*)>
<!ELEMENT title (#PCDATA)>

Q10

<!ELEMENT results (minprice*)>
<!ELEMENT minprice (price)
<!ATTLIST minprice title CDATA #REQUIRED>
<!ELEMENT price     (#PCDATA)>


Q11

<!ELEMENT bib (book*, reference*)>
<!ELEMENT book (title, author)>
<!ELEMENT reference (title, org)>
<!ELEMENT org (#PCDATA)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (last,first)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT first (#PCDATA)>

Q12

<!ELEMENT bib (book-pair*)>
<!ELEMENT book-pair (title, title)>
<!ELEMENT title (#PCDATA)>


Section 1.2 

Q1

<!ELEMENT toc (section+)>
<!ELEMENT section (title, section*)>
<!ATTLIST section
      id         ID    #IMPLIED
      difficulty CDATA #IMPLIED>
<!ELEMENT title (#PCDATA)>

Q2

<!ELEMENT figlist (figure*)>
<!ELEMENT figure 

<!ELEMENT figure (title)>
<!ATTLIST figure
     width   CDATA   #REQUIRED
     height  CDATA   #REQUIRED >

Q3

<!-- a hedge (section_count, figure_count) -->
<!ELEMENT section_count (#PCDATA)>
<!ELEMENT figure_count (#PCDATA)>


Q4

<!ELEMENT top_section_count (#PCDATA)>

Q5

<!ELEMENT section_list (section*)>
<!ELEMENT section (EMPTY)>
<!ATTLIST section
      title    CDATA #REQUIRED
      figcount CDATA #REQUIRED
>

Q6

<!ELEMENT toc (section*)>
<!ELEMENT section (title, figcount, section*)>
<!ATTLIST section
      id         ID    #IMPLIED
      difficulty CDATA #IMPLIED>
<!ELEMENT title (#PCDATA)>
<!ELEMENT figcount (#PCDATA)>

Section 1.3

Q1

<!ELEMENT instrument (#PCDATA)>

Q2

<!-- hedges rather than trees -->
<!ELEMENT instrument (#PCDATA)>

Q3

<!-- hedges rather than trees -->
<!ELEMENT instrument (#PCDATA)>

Q4

<!ELEMENT section (section.title, section.content)>
<!ELEMENT section.title  (#PCDATA )>
<!ELEMENT section.content  (#PCDATA | anesthesia | prep 
                            | incision | action | observation )*>
<!-- Mixed content models of XML 1.0 cannot capture the requirement. -->
<!ELEMENT anesthesia (#PCDATA)>
<!ELEMENT prep ( (#PCDATA | action)* )>
<!ELEMENT incision ( (#PCDATA | geography | instrument)* )>
<!ELEMENT action ( (#PCDATA | instrument )* )>
<!ELEMENT observation (#PCDATA)>
<!ELEMENT geography (#PCDATA)>
<!ELEMENT instrument (#PCDATA)>

Q5

<!--   (#PCDATA | anesthesia | prep | action | observation )*  -->
<!ELEMENT anesthesia (#PCDATA)>
<!ELEMENT prep ( (#PCDATA | action)* )>
<!ELEMENT incision ( (#PCDATA | geography | instrument)* )>
<!ELEMENT action ( (#PCDATA | instrument )* )>
<!ELEMENT observation (#PCDATA)>
<!ELEMENT geography (#PCDATA)>
<!ELEMENT instrument (#PCDATA)>


Section 1.4

Q1

<!ELEMENT result (item_tuple*)>
<!ELEMENT item_tuple (itemno, description)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>
  
Q2

<!ELEMENT result (item_tuple*)>
<!ELEMENT item_tuple (itemno, description)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT high_bid    (bid)>
<!ELEMENT bid         (#PCDATA)>

Q3


<!ELEMENT result (warning*)>
<!ELEMENT warning (name, rating, description, reserve_price)>
<!ELEMENT name    (#PCDATA)>
<!ELEMENT rating  (#PCDATA)>

<!ELEMENT reserve_price (#PCDATA)>

Q4

<!ELEMENT result (no_bid_item*)>
<!ELEMENT no_bid_item (itemno, description)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>

Q5

<!ELEMENT result (jones_bike*)>
<!ELEMENT jones_bike (itemno, description, high_bid, high_bidder)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT high_bid    (bid)>
<!ELEMENT bid         (#PCDATA)>
<!ELEMENT high_bidder (#PCDATA)>

Q6

<!ELEMENT result (successful_item*)>
<!ELEMENT successful_item (itemno, description, reserve_price, high_bid)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT high_bid    (bid)>
<!ELEMENT bid         (#PCDATA)>

Q7

<!ELEMENT high_bid    (bid)>
<!ELEMENT bid         (#PCDATA)>


Q8

<!ELEMENT item_count (#PCDATA)>

Q9

<!ELEMENT result         (monthly_report*)>
<!ELEMENT monthly_report (month, item_count)>
<!ELEMENT month          (#PCDATA)>
<!ELEMENT item_count     (#PCDATA)>

Q10

<!ELEMENT result      (high_bid*)>
<!ELEMENT high_bid    (itemno, bid, bidder)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT bid         (#PCDATA)>
<!ELEMENT bidder      (#PCDATA)>

Q11

<!ELEMENT result          (expensive_item*)>
<!ELEMENT expensive_item  (itemno, description, high_bid)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT high_bid    (bid)>
<!ELEMENT bid         (#PCDATA)>

Q12

<!ELEMENT result (popular_item*)>
<!ELEMENT popular_item (itemno, description, bid_count)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT bid_count   (#PCDATA)>

Q13

<!ELEMENT result (bidder*)>
<!ELEMENT bidder (userid, name, bidcount, avgbid)
<!ELEMENT userid      (#PCDATA)>
<!ELEMENT name        (#PCDATA)>
<!ELEMENT bidcount    (#PCDATA)>
<!ELEMENT avgbid      (#PCDATA)>

Q14

<!ELEMENT result (popular_item*)>
<!ELEMENT popular_item (itemno, avgbid)>
<!ELEMENT itemno      (#PCDATA)>
<!ELEMENT avgbid      (#PCDATA)>

Q15

<!ELEMENT result (big_spender*)>
<!ELEMENT big_spender (#PCDATA)>

Q16

<!ELEMENT result (user*)>
<!ELEMENT user (userid, name, status)>
<!ELEMENT userid      (#PCDATA)>
<!ELEMENT name        (#PCDATA)>
<!ELEMENT status      (#PCDATA)>  <!-- either inactive or active -->

Q17

<!ELEMENT frequent_bidder (name*)>
<!ELEMENT name        (#PCDATA)>

Q18

<!ELEMENT result (user*)>
<!ELEMENT user (name, bid_on_item*)>
<!ELEMENT name        (#PCDATA)>
<!ELEMENT bid_on_item (#PCDATA)>

Section 1.5

For Q1-5, Q8a
<!ELEMENT xref EMPTY>
<!ATTLIST xref xrefid CDATA #IMPLIED> <!-- IDREF reference may be broken --> 
<!ELEMENT emph (#PCDATA | emph)*>

Q1-3. 

<!ELEMENT result (para*)>
<!ELEMENT para (#PCDATA | emph | xref)*>
<!ATTLIST para security (u | c | s | ts) #IMPLIED>

Q4.

<!ELEMENT result (para?)>
<!ELEMENT para (#PCDATA | emph | xref)*>
<!ATTLIST para security (u | c | s | ts) #IMPLIED> 

Q5.

<!ELEMENT result (para?)>
<!ELEMENT para (#PCDATA | emph | xref)*>
<!ATTLIST para security #FIXED "c">   <!-- security should be "c" -->

Q6,7. 

<!ELEMENT result (#PCDATA)>

Q8a. Q8b.

<!ELEMENT result (section*)>
<!ELEMENT section (tiltle, intro?, topic*)>
<!ELEMNT topic (title, para | graphic)+>
<!ATTLIST topic shorttitle CDATA #IMPLIED topicid ID #IMPLIED>
<!ELEMENT intro (para | graphic)*>
<!ELEMENT graphic EMPTY>
<!ATTLIST graphic graphname ENTITY #REQUIRED>
<!ELEMENT title (#PCDATA | emph)*>
<!ELEMENT para (#PCDATA | emph | xref)*>
<!ATTLIST para security (u | c | s | ts) #IMPLIED>

Q9.

<!ELEMENT result (topic*)>
<!ELEMNT topic (title, para | graphic)+>
<!ATTLIST topic shorttitle CDATA #IMPLIED topicid ID #REQUIRED> <!-- we need topicid -->
<!ELEMENT intro (para | graphic)*>
<!ELEMENT graphic EMPTY>
<!ATTLIST graphic graphname ENTITY #REQUIRED>
<!ELEMENT title (#PCDATA | emph)*>
<!ELEMENT para (#PCDATA | emph | xref)*>
<!ATTLIST para security (u | c | s | ts) #IMPLIED>

Q10. 

<!ELEMENT result (title?)>
<!ELEMENT title (#PCDATA | emph)*>

Section 1.6

Q1.
<!-- a top level is title* -->
<!ELEMENT title (#PCDATA)>

Q2
<!-- a top level is news_item* -->
<!ELEMENT news_item (title, date)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT date (#PCDATA)>

Q3.
<!-- a top level is title* -->
<!ELEMENT title (#PCDATA)>

Q4, Q6.
<!-- a top level is news_item* -->
<!ELEMENT news_item (title, content, date, author?, news_agent)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT content (par | figure)+ >
<!ELEMENT date (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT news_agent (#PCDATA)>
<!ELEMENT par (#PCDATA | quote | footnote)*>
<!ELEMENT quote (#PCDATA)>
<!ELEMENT footnote (#PCDATA)>
<!ELEMENT figure (title, image)>
<!ELEMENT image EMPTY>
<!ATTLIST image source  CDATA  #REQUIRED >

Q5.
<!-- a top level is item_summary* -->
<!ELEMENT item_summary (#PCDATA) >

Section 1.7 

Since the input schema is not shown in the current version of 
XML Query Use Cases, we use an input schema as below:

<!ELEMENT ma:Auction (ma:AuctionHomepage, ma:Schedule, ma:Price, ma:TradingPartners, ma:Details)>

<!-- namespace declarations -->

<!ATTLIST ma:Auction
    xmlns:ma CDATA #FIXED "http://www.example.com/AuctionWatch"
    xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink"
    xmlns:anyzone CDATA #FIXED "http://www.example.com/auctioneers#anyzone"
    xmlns:eachbay CDATA #FIXED "http://www.example.com/auctioneers#eachbay"
    xmlns:yabadoo CDATA #FIXED "http://www.example.com/auctioneers#yabadoo"
    xmlns:dt CDATA #FIXED "http://www.w3.org/1999/XMLSchema-datatypes"
    xmlns:music CDATA #FIXED "http://www.example.org/music/records"
>

<!ELEMENT ma:AuctionWatchList (ma:Auction*)>

<!ELEMENT ma:AuctionHomepage EMPTY>
<!ATTLIST ma:AuctionHomepage 
         xlink:type (simple) #FIXED "simple" 
         xlink:href CDATA #REQUIRED 
         xlink:role CDATA #IMPLIED
>

<!ELEMENT ma:Schedule (ma:Open, ma:Close)>
<!ELEMENT ma:Open (#PCDATA)>
<!ELEMENT ma:Close (#PCDATA)>
<!ATTLIST ma:Open dt:type (timeInstant) #FiXED "timeInstant">
<!ATTLIST ma:Close dt:type (timeInstant) #FiXED "timeInstant">

<!ELEMENT ma:Price (ma:Start, ma:Current, ma:Number_of_Bids)>
<!ELEMENT ma:Start (#PCDATA)>
<!ELEMENT ma:Current (#PCDATA)>
<!ELEMENT ma:Number_of_Bids (#PCDATA)>
<!ATTLIST ma:Start ma:currency (USD) #FIXED "USD">
<!ATTLIST ma:Current ma:currency (USD) #FIXED "USD">
<!ELEMENT ma:TradingPartners (ma:High_Bidder, ma:Seller)>

<!ENTITY % eachbay.info 
         "eachbay:ID, 
          eachbay:PositiveComments, 
          eachbay:NeutralComments, 
          eachbay:NegativeComments">

<!ENTITY % yabadoo.info 
         "yabadoo:ID, 
          yabadoo:PositiveComments, 
          yabadoo:NeutralComments, 
          yabadoo:NegativeComments">

<!ENTITY % anyzone.info 
         "anyzone:ID, 
          anyzone:Member_Since,
          anyzone:Rating">

<!ELEMENT ma:High_Bidder 
       ((%eachbay_info; | %yabadoo.info; | %anyzone.info;), ma:MemberInfoPage)>

<!ELEMENT ma:Seller 
       ((%eachbay_info; | %yabadoo.info; | %anyzone.info;), ma:MemberInfoPage)>

<!ELEMENT eachbay:ID (#PCDATA)>
<!ELEMENT eachbay:PositiveComments (#PCDATA)>
<!ELEMENT eachbay:NeutralComments (#PCDATA)>
<!ELEMENT eachbay:NegativeComments (#PCDATA)>

<!ELEMENT yabadoo:ID (#PCDATA)>
<!ELEMENT yabadoo:PositiveComments (#PCDATA)>
<!ELEMENT yabadoo:NeutralComments (#PCDATA)>
<!ELEMENT yabadoo:NegativeComments (#PCDATA)>

<!ELEMENT anyzone:ID (#PCDATA)>
<!ELEMENT anyzone:Member_Since (#PCDATA)>
<!ELEMENT anyzone:Rating (#PCDATA)>

<!ELEMENT ma:MemberInfoPage EMPTY>

<!ATTLIST ma:MemberInfoPage 
       xlink:type (simple) #FIXED "simple" 
       xlink:href CDATA #REQUIRED 
       xlink:role CDATA #IMPLIED>

<!ELEMENT ma:Details (music:record)>

<!ELEMENT music:record (music:artist, music:title, music:recorded, music:label, ma:remark*)>
<!ELEMENT music:artist (#PCDATA)>
<!ELEMENT music:title (#PCDATA)>
<!ELEMENT music:recorded (#PCDATA)>
<!ELEMENT music:label (#PCDATA)>
<!ELEMENT music:remark (#PCDATA)>
<!ATTLIST music:remark xml:lang CDATA #IMPLIED>


Q1. 

<!ELEMENT Q1 (#PCDATA)>

Q2. 

<!ELEMENT Q2 (music:title*)>
<!ATTLIST Q2
    xmlns:music CDATA #FIXED "http://www.example.org/music/records"
>
<!ELEMENT music:title (#PCDATA)>

Q3.

<!ELEMENT Q3 (ma:Open, ma:Close)*>
<!ATTLIST Q3 
    xmlns:ma CDATA #FIXED "http://www.example.com/AuctionWatch"
>
<!ELEMENT ma:Open (#PCDATA)>
<!ELEMENT ma:Close (#PCDATA)>
<!ATTLIST ma:Open dt:type (timeInstant) #FiXED "timeInstant">
<!ATTLIST ma:Close dt:type (timeInstant) #FiXED "timeInstant">


Q4.

<!ELEMENT Q4 (#PCDATA)>

Q5.

<!ELEMENT Q5 (music:record*)>
<!ATTLIST Q5
    xmlns:music CDATA #FIXED "http://www.example.org/music/records"
>
<!ELEMENT music:record (music:artist, music:title, music:recorded, music:label, ma:remark*)>
<!ELEMENT music:artist (#PCDATA)>
<!ELEMENT music:title (#PCDATA)>
<!ELEMENT music:recorded (#PCDATA)>
<!ELEMENT music:label (#PCDATA)>
<!ELEMENT music:remark (#PCDATA)>
<!ATTLIST music:remark xml:lang (de) #FIXED "de"> <!-- de only -->

Q6.

<!ELEMENT Q6 (ma:Close*)>
<!ATTLIST Q6 
    xmlns:ma CDATA #FIXED "http://www.example.com/AuctionWatch"
>
<!ELEMENT ma:Close (#PCDATA)>
<!ATTLIST ma:Close dt:type (timeInstant) #FiXED "timeInstant">

Q7.

<!ELEMENT Q7 (ma:AuctionHomepage*)>
<!ATTLIST Q7 
    xmlns:ma CDATA #FIXED "http://www.example.com/AuctionWatch"
>
<!ELEMENT ma:AuctionHomepage EMPTY>
<!ATTLIST ma:AuctionHomepage 
         xlink:type (simple) #FIXED "simple" 
         xlink:href CDATA #REQUIRED 
         xlink:role CDATA #IMPLIED
>

Q8.

<!ELEMENT Q8 (ma:High_Bidder | ma:Seller)*> <!-- 0 negative comments cannot be captured -->

<!ATTLIST Q8
    xmlns:ma CDATA #FIXED "http://www.example.com/AuctionWatch"
    xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink"
    xmlns:anyzone CDATA #FIXED "http://www.example.com/auctioneers#anyzone"
    xmlns:eachbay CDATA #FIXED "http://www.example.com/auctioneers#eachbay"
    xmlns:yabadoo CDATA #FIXED "http://www.example.com/auctioneers#yabadoo"
>

<!ENTITY % eachbay.info 
         "eachbay:ID, 
          eachbay:PositiveComments, 
          eachbay:NeutralComments, 
          eachbay:NegativeComments">

<!ENTITY % yabadoo.info 
         "yabadoo:ID, 
          yabadoo:PositiveComments, 
          yabadoo:NeutralComments, 
          yabadoo:NegativeComments">

<!ENTITY % anyzone.info 
         "anyzone:ID, 
          anyzone:Member_Since,
          anyzone:Rating">

<!ELEMENT ma:High_Bidder 
       ((%eachbay_info; | %yabadoo.info; | %anyzone.info;), ma:MemberInfoPage)>

<!ELEMENT ma:Seller 
       ((%eachbay_info; | %yabadoo.info; | %anyzone.info;), ma:MemberInfoPage)>

<!ELEMENT ma:MemberInfoPage EMPTY>

<!ATTLIST ma:MemberInfoPage 
       xlink:type (simple) #FIXED "simple" 
       xlink:href CDATA #REQUIRED 
       xlink:role CDATA #IMPLIED>

<!ELEMENT eachbay:ID (#PCDATA)>
<!ELEMENT eachbay:PositiveComments (#PCDATA)>
<!ELEMENT eachbay:NeutralComments (#PCDATA)>
<!ELEMENT eachbay:NegativeComments (#PCDATA)>

<!ELEMENT yabadoo:ID (#PCDATA)>
<!ELEMENT yabadoo:PositiveComments (#PCDATA)>
<!ELEMENT yabadoo:NeutralComments (#PCDATA)>
<!ELEMENT yabadoo:NegativeComments (#PCDATA)>

<!ELEMENT anyzone:ID (#PCDATA)>
<!ELEMENT anyzone:Member_Since (#PCDATA)>
<!ELEMENT anyzone:Rating (#PCDATA)>


Section 1.8 -- output DTD is already given

Section 1.9 

<!ELEMENT census (person*)>
<!ELEMENT person (person*)>
<!ATTLIST person
                    name    ID      #REQUIRED
                    spouse  IDREF   #IMPLIED
                    job     CDATA   #IMPLIED>

Q1.

<!ELEMENT result (person?)> <!-- at most one -->
<!ELEMENT person EMPTY>
<!ATTLIST person name ID #REQUIRED spouse CDATA #REQUIRED job CDATA #IMPLIED>  

Q2-3, 6, 9

<!ELEMENT result (person)*> 
<!ELEMENT person EMPTY>
<!ATTLIST person name ID #REQUIRED spouse CDATA #IMPLIED job CDATA #IMPLIED>

Q4.

<!ELEMENT result (person)*>
<!ELEMENT person EMPTY>
<!ATTLIST person name ID #REQUIRED spouse CDATA #IMPLIED job CDATA #REQUIRED> <!-- person has a job -->

Q5.

<!ELEMENT result (match)*>
<!ELEMENT match EMPTY>
<!ATTLIST match parent CDATA #REQUIRED child CDATA #REQUIRED job CDATA #REQUIRED> <!-- parent and child duplicately appear -->

Q7.

<!ELEMENT result (grandparent)*>
<!ELEMENT grandparent EMPTY>
<!ATTLIST grandparent name CDATA #REQUIRED grandchild CDATA #REQUIRED>  <!-- grandparent and grandchild duplicately appear --> 

Q8.

<!ELEMENT result (person?, person?)> <!-- at most two persons -->
<!ELEMENT person EMPTY>
<!ATTLIST person name ID #REQUIRED spouse CDATA #IMPLIED job CDATA #IMPLIED> 

Q10.

<!ELEMENT result (person*)> 
<!ELEMENT person EMPTY>
<!ATTLIST person name ID #REQUIRED job CDATA #IMPLIED> <!-- no spouse -->

Q11.

<!ELEMENT result (descendant*)>
<!ELEMENT descendant (#PCDATA)>
<!ATTLIST married (Yes | No) #REQUIRED kids CDATA #REQUIRED> <!-- returns Yes or No and a number of kids -->
Received on Thursday, 5 July 2001 22:10:59 UTC