/*
 * Globally match regular expression and print
 * Modelled after the Unix command with the same name
 * D. Spinellis, January 2004
 */

import java.util.regex.*;
import java.io.*;

class Grep {
    public static void main(String args[]) {
        if (args.length != 2) {
            System.err.println("Usage: Grep pattern file");
            System.exit(1);
        }

        Pattern cre = null;        // Compiled RE
        try {
            cre = Pattern.compile(args[0]);
        } catch (PatternSyntaxException e) {
            System.err.println("Invalid RE syntax: " + e.getDescription());
            System.exit(1);
        }

        BufferedReader in = null;
        try {
            in = new BufferedReader(new InputStreamReader(new FileInputStream(args[1])));
        } catch (FileNotFoundException e) {
            System.err.println("Unable to open file " + args[1] + ": " + e.getMessage());
            System.exit(1);
        }

        try {
            String s;
            while ((s = in.readLine()) != null) {
                Matcher m = cre.matcher(s);
                if (m.find())
                    System.out.println(s);
            }
        } catch (Exception e) {
            System.err.println("Error reading line: " + e.getMessage());
            System.exit(1);
        }
    }
}

import java.util.*;
import java.util.regex.*;
import java.io.*;

/**
 * Collect and print Web statistics
 * @author D. Spinellis
 */
class WebStats {

    /**
     * Increment the integer value of map's member by 1
     * The member is obtained by using the matcher to extract
     * the specified group from the string s
     */
    static void increment(Map<String, Integer> map, String s, Matcher m, int group) {
        String member = s.substring(m.start(group), m.end(group));
        Integer i = map.get(member);
        map.put(member, i == null ? 1 : i + 1);
    }

    /** List the contents of the given map */
    static void list(String title, Map<String, Integer> map) {
        System.out.println("\n" + title);
        for (Map.Entry e : map.entrySet())
            System.out.println(e.getValue() + " " + e.getKey());
    }

    /** List the contents of the given map ordered by their values.
     * (You are not expected to undestand this).
     */
    static void sortedList(String title, Map<String, Integer> map) {
        System.out.println("\n" + title);
        TreeSet <Map.Entry<String, Integer>> valueOrder
            = new TreeSet<Map.Entry<String, Integer>>(new
            Comparator<Map.Entry<String, Integer>>() {
                public int compare(Map.Entry<String, Integer> a,
                        Map.Entry<String, Integer> b) {
                    return (-a.getValue().compareTo(b.getValue()));
                }
            }
        );
        valueOrder.addAll(map.entrySet());
        for (Map.Entry e : valueOrder)
            System.out.println(e.getValue() + " " + e.getKey());
    }



    public static void main(String args[]) {
        if (args.length != 1) {
            System.err.println("Usage: WebStats file");
            System.exit(1);
        }

        Pattern cre = null;        // Compiled RE
        try {
            // A standard log line is a line like:
            // 192.168.136.16 - - [26/Jan/2004:19:45:48 +0200] "GET /c136.html HTTP/1.1" 200 1674 "http://office/c120.html" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007"
            cre = Pattern.compile(
            "([-\\w.]+)\\s+" +    // 1. Host
            "([-\\w]+)\\s+" +    // 2. Logname
            "([-\\w]+)\\s+" +    // 3. User
            "\\[(\\d+)/" +        // 4. Date
            "(\\w+)/" +        // 5. Month
            "(\\d+):" +        // 6. Year
            "(\\d+):" +        // 7. Hour
            "(\\d+)" +        // 8. Minute
            "([^]]+?)\\]\\s+" +    // 9. Rest of time
            "\"([-\\w]+)\\s*" +    // 10. Request verb
            "([^\\s]*)" +        // 11. Request URL
            "([^\"]*?)\"\\s+" +    // 12. Request protocol etc.
            "(\\d+)\\s+" +        // 13. Status
            "([-\\d]+)\\s+" +    // 14. Bytes
            "\"([^\"]*)\"\\s+" +    // 15. Referrer URL
            "\"([^\"]*)\""        // 16. Client
            );
        } catch (PatternSyntaxException e) {
            System.err.println("Invalid RE syntax: " + e.getDescription());
            System.exit(1);
        }

        BufferedReader in = null;
        try {
            in = new BufferedReader(new InputStreamReader(new FileInputStream(args[0])));
        } catch (FileNotFoundException e) {
            System.err.println("Unable to open file " + args[1] + ": " + e.getMessage());
            System.exit(1);
        }

        HashMap<String, Integer> host, hour, request, referrer;
        host = new HashMap<String, Integer>();
        hour = new HashMap<String, Integer>();
        request = new HashMap<String, Integer>();
        referrer = new HashMap<String, Integer>();
        try {
            String s;
            while ((s = in.readLine()) != null) {
                Matcher m = cre.matcher(s);
                if (!m.matches())
                    System.out.println("Invalid line: " + s);
                else {
                    increment(host, s, m, 1);
                    increment(hour, s, m, 7);
                    increment(request, s, m, 11);
                    increment(referrer, s, m, 15);
                }
            }
        } catch (Exception e) {
            System.err.println("Error reading line: " + e.getMessage());
            System.exit(1);
        }
        sortedList("Host Access Counts", host);
        sortedList("Hourly Access Counts", hour);
        sortedList("Request URL Access Counts", request);
        sortedList("Referrer URL Access Counts", referrer);
    }
}

<city>Larisa</city>

 <?xml version="1.0" encoding="US-ASCII" ?>
 <city_info>
    <name>Larisa</name>
    <area_code>241</area_code>
    <latitude>39.38</latitude>
    <longitude>-22.25</longitude>
    <country>Greece</country>
 </city_info>

<alumnus />

<city country="el" id="HER">
<name>Hrakleio</name>
</city>

<?xml version="1.0" encoding="UTF-8"?>
<ekad xmlns="http://www.gsis.gr/ekad"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  afm="046523469">
    <branch aa="0">
        <kad typeOfKad="1">
            <value>71121908</value>
        </kad>
    </branch>
</ekad>

<?xml version="1.0" ?>
<studentID>802345</studentID>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="studentID" type="xsd:integer" />
</xsd:schema>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="studentID" >
        <xsd:simpleType>
            <xsd:restriction base="xsd:integer">
                <xsd:pattern value="80\d{4}" />
            </xsd:restriction>
        </xsd:simpleType>
    </xsd:element>
</xsd:schema>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
        <xsd:element name="grade" >
                <xsd:simpleType>
                  <xsd:restriction base="xsd:float">
                    <xsd:pattern value="\d+\.[05]"/>
                    <xsd:minInclusive value="0"/>
                    <xsd:maxInclusive value="10"/>
                  </xsd:restriction>
                </xsd:simpleType>
        </xsd:element>
</xsd:schema>

<xsd:simpleType>
  <xsd:restriction base="xsd:string">
    <xsd:enumeration value="Athens"/>
    <xsd:enumeration value="Thessaloniki"/>
    <xsd:enumeration value="Argostoli"/>
    <xsd:enumeration value="Volos"/>
    <!-- ... -->
  </xsd:restriction>
</xsd:simpleType>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="country">
  <xsd:complexType>
    <xsd:simpleContent >
        <xsd:extension base="xsd:string" >
            <xsd:attribute name="code" type="xsd:string" use="required" />
        </xsd:extension>
    </xsd:simpleContent >
  </xsd:complexType>
</xsd:element>
</xsd:schema>

<?xml version="1.0" ?>
<country code="el">Greece</country>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="javaProgram">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="package" type="xsd:string" />
                <xsd:element name="import" type="xsd:string" maxOccurs="unbounded" />
                <xsd:element name="class">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="name" type="xsd:string" />
                            <xsd:choice maxOccurs="unbounded">
                                <xsd:element name="field" type="xsd:string" />
                                <xsd:element name="ctor" type="xsd:string" />
                                <xsd:element name="method" type="xsd:string" />
                            </xsd:choice>
                        </xsd:sequence>
                        <xsd:attribute name="extends" type="xsd:string" use="optional" />
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

<?xml version="1.0" ?>
<javaProgram>
        <package>gr.aueb.dds.bio</package>
        <import>java.util.Date</import>
        <import>java.math.BigDecimal</import>
        <class extends="Object">
                <name>Point</name>
                <field>int x</field>
                <field>int y</field>
                <ctor>Point(int x, int y)</ctor>
                <field>static int numPoints</field>
        </class>
</javaProgram>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="class" >
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="student" type="xsd:string"
                 minOccurs="10" maxOccurs="150" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="http://www.gsis.gr/ekad" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.gsis.gr/ekad" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <xs:element name="ekad">
    <xs:annotation>
      <xs:documentation>root element</xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:sequence>
        <xs:element name="branch" nillable="false" maxOccurs="unbounded">
          <xs:annotation>
            <xs:documentation>Εγκατάσταση</xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="kad" maxOccurs="unbounded">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="value" nillable="false">
                      <xs:annotation>
                        <xs:documentation>Η τιμή του ΚΑΔ</xs:documentation>
                      </xs:annotation>
                      <xs:simpleType>
                        <xs:restriction base="xs:integer">
                          <xs:totalDigits value="15"/>
                        </xs:restriction>
                      </xs:simpleType>
                    </xs:element>
                  </xs:sequence>
                  <xs:attribute name="typeOfKad" use="required">
                    <xs:annotation>
                      <xs:documentation>Είδος ΚΑΔ (δραστηριότητας). 1=Κύρια, 2=Δευτερεύουσα, 3=Λοιπή, 4=Βοηθητική</xs:documentation>
                    </xs:annotation>
                    <xs:simpleType>
                      <xs:restriction base="xs:int">
                        <xs:enumeration value="1"/>
                        <xs:enumeration value="2"/>
                        <xs:enumeration value="3"/>
                        <xs:enumeration value="4"/>
                      </xs:restriction>
                    </xs:simpleType>
                  </xs:attribute>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
            <xs:attribute name="aa" use="required">
              <xs:annotation>
                <xs:documentation>ΑΑ εγκατάστασης. Η έδρα δηλώνεται σαν υποκατάστημα με ΑΑ=0. Εάν υπάρχει μητρική εταιρεία στο εξωτερικό, ο ΚΑΔ της δηλώνεται ως υποκατάστημα με ΑΑ=9999</xs:documentation>
              </xs:annotation>
              <xs:simpleType>
                <xs:restriction base="xs:int">
                  <xs:minInclusive value="0"/>
                </xs:restriction>
              </xs:simpleType>
            </xs:attribute>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="afm" use="required">
        <xs:annotation>
          <xs:documentation>ΑΦΜ υπόχρεου</xs:documentation>
        </xs:annotation>
        <xs:simpleType>
          <xs:restriction base="xs:string">
            <xs:minLength value="9"/>
            <xs:maxLength value="9"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
    </xs:complexType>
  </xs:element>
</xs:schema>

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="project">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="shortname" type="xsd:string" />
                <xsd:element name="projtitle" type="xsd:string" />
                <xsd:element name="startdate" type="xsd:date" minOccurs="0" />
                <xsd:element name="enddate" type="xsd:date" />
                <xsd:element name="web_site" type="xsd:string" minOccurs="0" />
                <xsd:element name="our_budget" type="xsd:integer" minOccurs="0" />
                <xsd:element name="total_budget" type="xsd:integer" minOccurs="0" />
                <xsd:element name="funding_agency" type="xsd:string" minOccurs="0" />
                <xsd:element name="funding_programme" type="xsd:string" minOccurs="0" />
                <xsd:element name="project_code" type="xsd:string" minOccurs="0" />
                <xsd:element name="partner" minOccurs="0" maxOccurs="unbounded">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="shortname" type="xsd:string" />
                            <xsd:element name="country" type="xsd:string" />
                            <xsd:element name="web_site" type="xsd:string" minOccurs="0" />
                        </xsd:sequence>
                    </xsd:complexType>
                </xsd:element>
                <xsd:element name="logo" type="xsd:string" minOccurs="0" />
                <xsd:element name="description" type="xsd:string" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

<?xml version="1.0"?>
<project>
        <shortname>mExpress</shortname>
        <projtitle>mobile in-EXhibition PRovision of Electronic Support Services</projtitle>
        <startdate>2002-03-05</startdate>
        <enddate>2004-04-01</enddate>
        <web_site>http://mexpress.intranet.gr/</web_site>
        <our_budget>328</our_budget>
        <total_budget>3493</total_budget>
        <funding_agency>European Commission</funding_agency>
        <funding_programme>IST</funding_programme>
        <project_code>IST-2001-33432</project_code>
        <partner>
                <shortname>Intracom</shortname>
                <country>EL</country>
                <web_site>http://www.intracom.gr</web_site>
        </partner>
        <partner>
                <shortname>Ericsson</shortname>
                <country>DK</country>
                <web_site>http://www.ericsson.com/</web_site>
        </partner>
        <partner>
                <shortname>ELISA</shortname>
                <country>FIN</country>
                <web_site>http://www.elisa.com</web_site>
        </partner>
        <partner>
                <shortname>POULIADIS</shortname>
                <country>EL</country>
                <web_site>http://www.pouliadis.gr</web_site>
        </partner>
        <partner>
                <shortname>SSF</shortname>
                <country>FIN</country>
                <web_site>http://www.ssf.fi/</web_site>
        </partner>
        <partner>
                <shortname>HUT</shortname>
                <country>FIN</country>
                <web_site>http://www.hut.fi</web_site>
        </partner>
        <partner>
                <shortname>FFC</shortname>
                <country>FIN</country>
        </partner>
        <partner>
                <shortname>ROTA</shortname>
                <country>EL</country>
                <web_site>http://www.rota.gr</web_site>
        </partner>
        <logo>../images/p_mexpress.gif</logo>
        <description>
mEXPRESS aims to exploit the technological opportunities arising from
evolution in the areas of wireless networks and positioning mechanisms in
order to support and facilitate the professional exhibition industry in
a context-aware manner. It will contribute to the economic development of
the Community by providing means for efficient operation and interaction
in information-rich environments such as exhibitions, and significantly
enhancing promotional activities and business communications. The mEXPRESS
project will provide an integrated mediation platform (mEXPRESS Service
Provider) oriented to exhibition shows and events.
        </description>
</project>

<?xml version="1.0"?>
<!-- Apply using
xml tr project.xslt mexpress.xml
-->
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:template match="project">
                <h1>
                <xsl:value-of select="shortname" />
                -
                <xsl:value-of select="projtitle" />
                </h1>
                <!-- Show Logo -->
                <xsl:element name="img">
                        <xsl:attribute name="src"><xsl:value-of select="logo" /></xsl:attribute>
                </xsl:element>
                <br /> <br />
                <!-- Project Summary information -->
                <xsl:if test="count(project_code) != 0">
                        Project Code:
                        <xsl:value-of select="project_code" />
                        <xsl:if test="@international = 'yes'">
                                (International)
                        </xsl:if>
                        <br/>
                </xsl:if>
                <xsl:if test="count(funding_programme) != 0">
                        Funding programme: <xsl:value-of select="funding_programme" />
                        <br />
                </xsl:if>
                <xsl:if test="count(funding_agency) != 0">
                        Funding Agency: <xsl:value-of select="funding_agency" />
                        <br />
                </xsl:if>
                <xsl:if test="@type != ''">
                        Project type:
                        <xsl:choose>
                                <xsl:when test="@type = 'rtd'">RTD</xsl:when>
                                <xsl:when test="@type = 'consulting'">Consulting</xsl:when>
                                <xsl:when test="@type = 'training'">Training</xsl:when>
                                <xsl:when test="@type = 'dissemination'">Dissemination</xsl:when>
                        </xsl:choose>
                        <br />
                </xsl:if>
                <xsl:if test="count(web_site) != 0">
                        Web site:
                        <xsl:element name="a">
                                <xsl:attribute name="href"><xsl:value-of select="web_site"/></xsl:attribute>
                                <xsl:value-of select="web_site" />
                        </xsl:element>
                        <br />
                        <br />
                </xsl:if>
                <xsl:if test="count(our_budget) != 0">
                        ELTRUN budget: <xsl:value-of select="our_budget" /> EUR
                        <br />
                </xsl:if>
                <xsl:if test="count(total_budget) != 0">
                        Total budget: <xsl:value-of select="total_budget" /> EUR
                        <br />
                </xsl:if>
                <br />
        </xsl:template>
</xsl:stylesheet>

import javax.xml.parsers.*;
import java.io.*;
import org.w3c.dom.*;

class Average {
    public static void main(String args[]) {

        if (args.length != 2) {
            System.err.println("Usage: Average element file");
            System.exit(1);
        }

        Document doc = null;
        try {
            // Create the DocumentBuilderFactory
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            // Create the document builder
            DocumentBuilder db = dbf.newDocumentBuilder();
            // Create DOM document from the file
            doc = db.parse(new File(args[1]));
        } catch (Exception e) {
            System.err.println("Parsing failed: " + e);
            System.exit(1);
        }

        NodeList nodes = doc.getElementsByTagName(args[0]);
        double sum = 0.0;
        for (int i = 0; i < nodes.getLength(); i++) {
            String grade = nodes.item(i).getFirstChild().getNodeValue();
            sum += (Integer.valueOf(grade)).doubleValue();
        }
        System.out.println(sum / nodes.getLength());
    }
}

<result_list>
    <result>
        <id>809678</id>
        <grade>9</grade>
    </result>
    <result>
        <id>809630</id>
        <grade>8</grade>
    </result>
    <result>
        <id>809679</id>
        <grade>10</grade>
    </result>
    <result>
        <id>809673</id>
        <grade>6</grade>
    </result>
</result_list>

<!--
 -
 - Document Type Description for the projects
 -
 - $Id: project.dtd,v 1.2 2004/01/24 20:20:04 bkarak Exp $
 -
-->
<!ELEMENT project (
    shortname, 
    projtitle, 
    startdate?, 
    enddate, 
    web_site?, 
    our_budget?, 
    total_budget?, 
    funding_agency?, 
    funding_programme?, 
    project_code?, 
    partner*, 
    logo?, 
    description
)>

<!ELEMENT projtitle (#PCDATA)>
<!ELEMENT our_budget (#PCDATA)>
<!ELEMENT total_budget (#PCDATA)>
<!ELEMENT funding_agency (#PCDATA)>
<!ELEMENT funding_programme (#PCDATA)>
<!ELEMENT project_code (#PCDATA)>
<!ELEMENT web_site (#PCDATA)>
<!ELEMENT startdate (#PCDATA)>
<!ELEMENT enddate (#PCDATA)>
<!ELEMENT shortname (#PCDATA)>
<!ELEMENT logo (#PCDATA)>
<!ELEMENT description (#PCDATA)>

<!ELEMENT partner (shortname, country, web_site?)>
<!ELEMENT shortname (#PCDATA)>
<!ELEMENT country (#PCDATA)>

<?xml version="1.0"?>
<project>
    <shortname>mExpress</shortname>
    <projtitle>mobile in-EXhibition PRovision of Electronic Support Services</projtitle>
    <startdate>20020305</startdate>
    <enddate>20040401</enddate>
    <web_site>http://mexpress.intranet.gr/</web_site>
    <our_budget>328 EUR</our_budget>
    <total_budget>3,493 EUR</total_budget>
    <funding_agency>European Commission</funding_agency>
    <funding_programme>IST</funding_programme>
    <project_code>IST-2001-33432</project_code>
    <partner>
        <shortname>Intracom</shortname>
        <country>EL</country>
        <web_site>http://www.intracom.gr</web_site>
    </partner>
    <partner>
        <shortname>Ericsson</shortname>
        <country>DK</country>
        <web_site>http://www.ericsson.com/</web_site>
    </partner>
    <partner>
        <shortname>ELISA</shortname>
        <country>FIN</country>
        <web_site>http://www.elisa.com</web_site>
    </partner>
    <partner>
        <shortname>POULIADIS</shortname>
        <country>EL</country>
        <web_site>http://www.pouliadis.gr</web_site>
    </partner>
    <partner>
        <shortname>SSF</shortname>
        <country>FIN</country>
        <web_site>http://www.ssf.fi/</web_site>
    </partner>
    <partner>
        <shortname>HUT</shortname>
        <country>FIN</country>
        <web_site>http://www.hut.fi</web_site>
    </partner>
    <partner>
        <shortname>FFC</shortname>
        <country>FIN</country>
    </partner>
    <partner>
        <shortname>ROTA</shortname>
        <country>EL</country>
        <web_site>http://www.rota.gr</web_site>
    </partner>
    <logo>../images/p_mexpress.gif</logo>
    <description>
mEXPRESS aims to exploit the technological opportunities arising from
evolution in the areas of wireless networks and positioning mechanisms in
order to support and facilitate the professional exhibition industry in
a context-aware manner. It will contribute to the economic development of
the Community by providing means for efficient operation and interaction
in information-rich environments such as exhibitions, and significantly
enhancing promotional activities and business communications. The mEXPRESS
project will provide an integrated mediation platform (mEXPRESS Service
Provider) oriented to exhibition shows and events.
    </description>
</project>

<!ATTLIST όνομα_στοιχείου
    όνομα_προσδιορισμού τύπος_προσδιορισμού περιορισμός
    ...
>

<!ATTLIST project
    id ID #REQUIRED
    contact CDATA #IMPLIED
    scientific_coordinator CDATA #IMPLIED
    project_manager CDATA #IMPLIED
    group CDATA #REQUIRED
    international (yes | no) #REQUIRED
    type (consulting | rtd | training | dissemination) #REQUIRED
>

<?xml version="1.0"?>
<project
    id="p_mexpress"
    group="g_sense g_wrc"
    scientific_coordinator="m_dds"
    contact="m_pateli"
    international="yes"
    type="rtd"
    project_manager="m_pateli"
>
<!-- ... -->
</project>