C#

// Method used to Serialize C# Objects into XML
        private string serializeXML(object objToSerialize)
        {
            String XmlizedString = null;
            MemoryStream mStream = new MemoryStream();
            XmlSerializer xs = new XmlSerializer(objToSerialize.GetType());

            XmlTextWriter xmlTextWriter = new XmlTextWriter(mStream, Encoding.UTF8);
            xs.Serialize(xmlTextWriter, objToSerialize);
            mStream = (MemoryStream)xmlTextWriter.BaseStream;
            XmlizedString = U8ByteArrayToString(mStream.ToArray());
           

 // Method used to Convert UTF8 ByteArray into a String
        private String U8ByteArrayToString(Byte[] characters)
        {

            UTF8Encoding encoding = new UTF8Encoding();
            String conString = encoding.GetString(characters);
            return (conString);
        }

using System;
using System.Linq;
using System.Xml.Linq;

class Program
{
    static void Main()
    {
        XDocument document = XDocument.Load(@"d:\test.xml");

        var priceInfo = from e in document.Descendants("MPrice").Elements("Price")
                        let start = DateTime.Parse(e.Descendants("StartDt").FirstOrDefault().Value)
                        let end = DateTime.Parse(e.Descendants("EndDt").FirstOrDefault().Value)
                        where start < DateTime.Now && end > DateTime.Now
                        select new { Id = e.Parent.Element("Id").Value, ListPrice = e.Element("ListPrice").Value };

        Console.WriteLine(priceInfo.FirstOrDefault().Id);
        Console.WriteLine(priceInfo.FirstOrDefault().ListPrice);
    }
}

The following is the metatag:
<ns2:RetsubPack serviceSuccessful="true" returnCode="0" xmlns:ns2="http://test1/test">
    <statusDescription>Package Details retrieved Successfully</statusDescription>
    <PackageDetails>
        <Type>type2</Type>
        <Category>dog</Category>
        <ContName>Co 1</ContgName>
        <TotalTrans>0</TotalTrans>
     </PackageDetails>
    <NumberOfDocuments>3</NumberOfDocuments>
    <subDocuments attachmentId="xx1">
        <DocumentMetadata>
            <DocumentTypeCode>Spreadsheet1</DocumentTypeCode>
            <PackageId>pkg1</PackageId>
        </DocumentMetadata>
    </subDocuments>
    <subDocuments attachmentId="xx2">
        <DocumentMetadata>
            <DocumentTypeCode>Spreadsheet2</DocumentTypeCode>
            <PackageId>pkg1</PackageId>
        </DocumentMetadata>
    </subDocuments>
    <subDocuments attachmentId="xx3">
       
</ns2:RetsubPack>

A) It must contain at least one vowel. 
B) It cannot contain three consecutive vowels or three consecutive consonants. 
C) It cannot contain two consecutive occurrences of the same letter, except for 'ee' or 'oo'.