See https://developer.yahoo.com/fantasysports/guide/ for details

transaction_pending.xml

<?xml version="1.0" encoding="UTF-8"?>
<fantasy_content xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" xmlns="http://fantasysports.yahooapis.com/fantasy/v2/base.rng" xml:lang="en-US" yahoo:uri="http://fantasysports.yahooapis.com/fantasy/v2/transaction/257.l.193.pt.1" time="45.558929443359ms" copyright="Data provided by Yahoo! and STATS, LLC">
  <transaction>
    <transaction_key>257.l.193.pt.1</transaction_key>
    <type>pending_trade</type>
    <status>proposed</status>
    <trader_team_key>257.l.193.t.2</trader_team_key>
    <tradee_team_key>257.l.193.t.1</tradee_team_key>
    <trade_proposed_time>1310694832</trade_proposed_time>
    <trade_note>This is a great trade, fo' shizzle.</trade_note>
    <players count="2">
      <player>
        <player_key>257.p.8261</player_key>
        <player_id>8261</player_id>
        <name>
          <full>Adrian Peterson</full>
          <first>Adrian</first>
          <last>Peterson</last>
          <ascii_first>Adrian</ascii_first>
          <ascii_last>Peterson</ascii_last>
        </name>
        <transaction_data>
          <type>pending_trade</type>
          <source_type>team</source_type>
          <source_team_key>257.l.193.t.2</source_team_key>
          <destination_type>team</destination_type>
          <destination_team_key>257.l.193.t.1</destination_team_key>
        </transaction_data>
      </player>
      <player>
        <player_key>257.p.9527</player_key>
        <player_id>9527</player_id>
        <name>
          <full>Arian Foster</full>
          <first>Arian</first>
          <last>Foster</last>
          <ascii_first>Arian</ascii_first>
          <ascii_last>Foster</ascii_last>
        </name>
        <transaction_data>
          <type>pending_trade</type>
          <source_type>team</source_type>
          <source_team_key>257.l.193.t.1</source_team_key>
          <destination_type>team</destination_type>
          <destination_team_key>257.l.193.t.2</destination_team_key>
        </transaction_data>
      </player>
    </players>
  </transaction>
</fantasy_content>